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sparkchess.com

sparkchess.com is SSL secured

Free website and domain report on sparkchess.com

Last Updated: 17th October, 2022 Update Now
Overview

Snoop Summary for sparkchess.com

This is a free and comprehensive report about sparkchess.com. The domain sparkchess.com is currently hosted on a server located in United States with the IP address 104.26.14.225, where USD is the local currency and the local language is English. Our records indicate that sparkchess.com is owned/operated by Cloudflare, Inc.. Sparkchess.com has the potential to be earning an estimated $13 USD per day from advertising revenue. If sparkchess.com was to be sold it would possibly be worth $9,195 USD (based on the daily revenue potential of the website over a 24 month period). Sparkchess.com is quite popular with an estimated 4,415 daily unique visitors. This report was last updated 17th October, 2022.

About sparkchess.com

Site Preview: sparkchess.com sparkchess.com
Title: SparkChess: Play chess online vs the computer or in multiplayer
Description: Play, learn and have fun with the most advanced free online chess game. Improve your skills with various AI opponents or challenge your friends in multiplayer!
Keywords and Tags: games, media downloads, popular
Related Terms: blitz chess online, chess com, chess rankings, chess solver, massive multiplayer, massively multiplayer online, online multiplayer, play blitz chess, play chess against computer, scopa multiplayer flashgames
Fav Icon:
Age: Over 15 years old
Domain Created: 5th August, 2008
Domain Updated: 7th June, 2018
Domain Expires: 5th August, 2024
Review

Snoop Score

3/5 (Great!)

Valuation

$9,195 USD
Note: All valuation figures are estimates.

Popularity

Modest
Note: Popularity is estimated.

Rank, Reach and Authority

Alexa Rank: 139,419
Alexa Reach:
SEMrush Rank (US):
SEMrush Authority Score:
Moz Domain Authority: 0
Moz Page Authority: 0

Organic vs Paid (Google Ads)

Traffic

Visitors

Daily Visitors: 4,415
Monthly Visitors: 134,379
Yearly Visitors: 1,611,475
Note: All visitors figures are estimates.

Visitors By Country

Revenue

Revenue

Daily Revenue: $13 USD
Monthly Revenue: $383 USD
Yearly Revenue: $4,593 USD
Note: All revenue figures are estimates.

Revenue By Country

SEO

Backlinks Analysis (SEMrush)

Top New Follow Links

Top Ranking Keywords (US)

Domain Analysis

Value Length
Domain: sparkchess.com 14
Domain Name: sparkchess 10
Extension (TLD): com 3
Expiry Check:

Page Speed Analysis

Average Load Time: 1.14 seconds
Load Time Comparison: Faster than 73% of sites

PageSpeed Insights

Avg. (All Categories) 92
Performance 89
Accessibility 90
Best Practices 92
SEO 100
PWA 89
0–49 (Fail) 50–89 (Average) 90–100 (Pass)
URL: https://www.sparkchess.com/
Updated: 17th October, 2022

1.17 seconds
First Contentful Paint (FCP)
87%
8%
5%

0.01 seconds
First Input Delay (FID)
97%
2%
1%

Simulate loading on desktop
89

Performance

Indicates how well the page is performing and highlights opportunities where performance may be improved for sparkchess.com. This includes details about optimizing page load times which can result in a better user experience.

Metrics

First Contentful Paint — 0.8 s
The time taken for the first image or text on the page to be rendered.
Total Blocking Time — 120 ms
The total blocking time is the sum of all time periods between First Contentful Paint and Time to Interactive (when task length exceeded 50ms).
Cumulative Layout Shift — 0.029
Cumulative Layout Shift is the measurement of visible elements collective movement within the viewport.
View Data

Audits

Max Potential First Input Delay — 90 ms
Users could experience a delay when interacting with the page.
First Meaningful Paint — 0.8 s
The time taken for the primary content of the page to be rendered.
Network Requests
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Fetch
Network Round Trip Times — 0 ms
High Network RTT (Round Trip Times) can have a large impact on performance. Providing servers geographically closer to the user could improve performance.
Server Backend Latencies — 0 ms
High server latencies indicate the server is overloaded or has a poor backend performance.
Tasks
Below is a list of the top-level main thread tasks that executed during page load.
Start Time (Ms) End Time (Ms)
334.669
11.747
423.539
5.352
433.708
32.876
479.342
35.326
518.618
25.027
546.898
54.979
603.163
28.076
635.528
22.663
659.054
28.811
687.896
51.099
739.075
14.759
757.051
15.269
776.898
18.74
800.67
16.292
877.611
61.785
945.23
13.997
961.917
16.729
985.614
8.513
1006.606
7.287
1037.607
25.232
1066.351
16.567
1083.432
17.789
1107.194
13.623
1124.402
14.831
1153.665
14.525
1168.324
5.123
1177.366
11.259
1188.656
6.243
1194.916
13.596
1208.563
6.205
1215.479
14.483
1230.959
13.173
1244.969
12.316
1258.737
15.405
1275.139
11.372
1369.017
6.792
1382.113
16.595
1400.966
7.49
1419.775
5.348
1428.099
43.98
1476.807
28.098
1521.461
164.58
1689.419
8.665
1706.165
91.512
1801.08
5.868
1809.311
6.801
1825.534
6.005
1831.855
5.046
1838.789
12.66
1856.776
161.902
2022.456
8.268
2030.74
7.894
2048.806
8.843
2101.663
35.62
2137.322
12.601
2150.665
7.964
2164.057
11.137
2180.184
66.97
2247.955
8.916
2261.271
6.533
2267.831
5.412
2275.311
17.956
2293.28
5.726
2305.064
20.625
2326.233
5.108
2336.605
152.106
2493.509
7.446
2512.245
12.282
3205.784
5.156
3560.442
5.286
Diagnostics
Below is a collection of useful page vitals.
View Data
Metrics
Below is a collection of metrics.
View Data
Script Treemap Data
Provide as required, for treemap app.

Other

Eliminate render-blocking resources
Resources, such as JavaScript and style sheets, can block the first paint of the page. Sparkchess.com should consider delivering critical JavaScript/style sheets (JS/CSS) inline and deferring all non-critical JS/CSS.
Properly size images
Images can slow down the page's load time. Sparkchess.com should consider serving more appropriate-sized images.
Defer offscreen images
Time to Interactive can be slowed down by resources on the page. Sparkchess.com should consider lazy-loading offscreen and hidden images.
Minify CSS
Cascading Style Sheets (CSS) files can contribute to network payload sizes. Sparkchess.com should consider minifying CSS files.
Minify JavaScript
JavaScript (JS) files can contribute to network payload sizes and increase script parse times. Sparkchess.com should consider minifying JS files.
Efficiently encode images
Unoptimized images can consume more cellular data than what is necessary.
Serve images in next-gen formats — Potential savings of 28 KiB
Consider JPEG 2000, JPEG XR or WebP image formats which provide better compression than PNG and JPEG.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://tpc.googlesyndication.com/daca_images/simgad/340099698639993479
44511
28537.15
Enable text compression
Text-based resources should be served with compression, such as gzip, deflate or brotli.
Preconnect to required origins
Resource hints, such as 'preconnect' or 'dns-prefetch', may assist in establishing early connections to important third-party origins.
Initial server response time was short — Root document took 100 ms
It is advised to keep the server response time short for the main document, because all other requests depend on it.
URL Time Spent (Ms)
https://www.sparkchess.com/
97.567
Preload key requests
Key requests can be preloaded by using '<link rel=preload>'. Sparkchess.com should consider using '<link rel=preload>' to prioritize fetching resources that are currently requested later in page load.
Use video formats for animated content
Large GIFs are inefficient for delivering animated content. It is recommended to use MPEG4/WebM videos for animations and PNG/WebP for static images instead of GIF.
Remove duplicate modules in JavaScript bundles
Ensure that no duplicate JavaScript modules from bundles exist to reduce bytes consumed by network activity.
Avoid serving legacy JavaScript to modern browsers — Potential savings of 10 KiB
Polyfills and transforms enable legacy browsers to use new JavaScript features. For bundled JavaScript it is recommended to adopt a modern script deployment strategy using module/nomodule feature detection. This will reduce the amount of code shipped to modern browsers.
URL Potential Savings (Bytes)
https://www.sparkchess.com/res/game/sparkchess-4065fb1670.js
10220
Preload Largest Contentful Paint image
It is recommended to preload images used by LCP elements, to improve LCP time.
Avoids enormous network payloads — Total size was 1,333 KiB
Large network payloads can cost users money and are linked to long load times.
URL Transfer Size (Bytes)
https://www.sparkchess.com/res/game/sparkchess-4065fb1670.js
171565
https://imasdk.googleapis.com/js/sdkloader/ima3.js
130471
https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202210100101/show_ads_impl_fy2021.js
128140
https://www.sparkchess.com/res/game/images-low-webp-d7a2a1a12e.css
108889
https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202210100101/reactive_library_fy2021.js
55796
https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js
55246
https://www.sparkchess.com/res/game/sparkchess-6066fdeabf.css
51928
https://www.googletagservices.com/activeview/js/current/rx_lidar.js?cache=r20110914
48335
https://www.googletagservices.com/activeview/js/current/rx_lidar.js?cache=r20110914
48335
https://www.googletagservices.com/activeview/js/current/rx_lidar.js?cache=r20110914
48335
Avoid chaining critical requests — 3 chains found
Below is a list of Critical Request Chains, which shows which resources are loaded with a high priority. Sparkchess.com should consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.
User Timing marks and measures
Make use of the User Timing API to measure an app's real-world performance during key user experiences.
JavaScript execution time — 1.1 s
JavaScript (JS) execution time can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
URL Total CPU Time (Ms) Script Evaluation (Ms) Script Parse (Ms)
https://www.sparkchess.com/
282.717
17.299
2.797
https://googleads.g.doubleclick.net/pagead/ads?client=ca-pub-1185411301591128&output=html&h=600&slotname=8154824491&adk=219779326&adf=1514276115&pi=t.ma~as.8154824491&w=160&fwrn=4&fwrnh=100&lmt=1665755969&rafmt=1&format=160x600&url=https%3A%2F%2Fwww.sparkchess.com%2F&fwr=0&rpe=1&resp_fmts=4&wgl=1&uach=WyJtYWNPUyIsIjEwLjE1LjciLCJ4ODYiLCIiLCI5OC4wLjQ2OTUuMCIsW10sZmFsc2UsbnVsbCwiIixbXSxmYWxzZV0.&dt=1666033266583&bpp=2&bdt=475&idt=135&shv=r20221012&mjsv=m202210100101&ptt=9&saldr=aa&abxe=1&prev_fmts=160x600&correlator=6617366647012&frm=20&pv=1&ga_vid=424002746.1666033266&ga_sid=1666033267&ga_hid=1300634376&ga_fc=1&u_tz=-420&u_his=2&u_h=600&u_w=800&u_ah=600&u_aw=800&u_cd=24&u_sd=1&dmc=8&adx=1170&ady=80&biw=1350&bih=940&scr_x=0&scr_y=0&eid=44759876%2C44759927%2C44759842%2C44774718%2C42531705%2C31069178%2C44770765%2C31062930%2C31068919&oid=2&pvsid=698006283590411&tmod=1707463634&uas=0&nvt=1&eae=0&fc=896&brdim=0%2C0%2C0%2C0%2C800%2C0%2C1%2C1%2C1350%2C940&vis=1&rsz=%7C%7CpeE%7C&abl=CS&pfx=0&alvm=r20221013&fu=128&bc=31&ifi=2&uci=a!2&fsb=1&xpc=gi6Ojp9QZn&p=https%3A//www.sparkchess.com&dtd=143
210.704
167.405
9.57
https://www.googletagservices.com/activeview/js/current/rx_lidar.js?cache=r20110914
203.395
175.756
20.873
https://googleads.g.doubleclick.net/pagead/ads?client=ca-pub-1185411301591128&output=html&h=600&slotname=2576818895&adk=328910097&adf=2169075639&pi=t.ma~as.2576818895&w=160&fwrn=4&fwrnh=100&lmt=1665755969&rafmt=1&format=160x600&url=https%3A%2F%2Fwww.sparkchess.com%2F&fwr=0&fwrattr=true&rpe=1&resp_fmts=4&wgl=1&uach=WyJtYWNPUyIsIjEwLjE1LjciLCJ4ODYiLCIiLCI5OC4wLjQ2OTUuMCIsW10sZmFsc2UsbnVsbCwiIixbXSxmYWxzZV0.&dt=1666033266575&bpp=8&bdt=466&idt=96&shv=r20221012&mjsv=m202210100101&ptt=9&saldr=aa&abxe=1&correlator=6617366647012&frm=20&pv=2&ga_vid=424002746.1666033266&ga_sid=1666033267&ga_hid=1300634376&ga_fc=1&u_tz=-420&u_his=2&u_h=600&u_w=800&u_ah=600&u_aw=800&u_cd=24&u_sd=1&dmc=8&adx=20&ady=80&biw=1350&bih=940&scr_x=0&scr_y=0&eid=44759876%2C44759927%2C44759842%2C44774718%2C42531705%2C31069178%2C44770765%2C31062930%2C31068919&oid=2&pvsid=698006283590411&tmod=1707463634&uas=0&nvt=1&eae=0&fc=896&brdim=0%2C0%2C0%2C0%2C800%2C0%2C1%2C1%2C1350%2C940&vis=1&rsz=%7C%7CpeE%7C&abl=CS&pfx=0&alvm=r20221013&fu=128&bc=31&ifi=1&uci=a!1&fsb=1&xpc=wHsFbgBgJO&p=https%3A//www.sparkchess.com&dtd=127
199.04
154.585
8.499
https://tpc.googlesyndication.com/sodar/sodar2/225/runner.html
186.782
175.79
2.241
https://googleads.g.doubleclick.net/pagead/html/r20221012/r20110914/zrt_lookup.html?fsb=1
169.393
156.257
3.09
Unattributable
137.15
11.448
0.14
https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202210100101/reactive_library_fy2021.js
112.23
36.741
2.603
https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202210100101/show_ads_impl_fy2021.js
89.372
71.966
5.397
https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js
63.401
52.572
2.951
https://www.sparkchess.com/res/game/sparkchess-4065fb1670.js
51.818
32.259
6.878
Minimizes main-thread work — 2.0 s
Main-thread work timing can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
Category Time Spent (Ms)
Script Evaluation
1225.139
Other
263.571
Style & Layout
180.349
Script Parsing & Compilation
108.919
Rendering
99.102
Garbage Collection
82.105
Parse HTML & CSS
54.149
All text remains visible during webfont loads
Make use of the font-display CSS feature, which will ensure text is user-visible while webfonts are loading.
Keep request counts low and transfer sizes small — 80 requests • 1,333 KiB
It is advised to add a budgets.json file in order to set budgets for the quantity and size of page resources.
Resource Type Requests Transfer Size (Bytes)
Total
80
1365371
Script
33
903640
Stylesheet
3
162489
Document
12
141662
Image
18
129219
Other
13
20302
Font
1
8059
Media
0
0
Third-party
60
932524
Lazy load third-party resources with facades
Consider replacing third-party embeds with a facade until they are required (use lazy loading).
Largest Contentful Paint element — 1 element found
The element which was identified as the Largest Contentful Paint.
Element
div#sparkchess > div#bmc > div#boardManager > div.background
Largest Contentful Paint image was not lazily loaded
Above-the-fold images that are lazily loaded render later in the page lifecycle, which can delay the largest contentful paint.
Element
div#sparkchess > div#bmc > div#boardManager > div.background
Avoid large layout shifts — 5 elements found
Below is a list of all DOM elements that contribute to the CLS of the page.
Element CLS Contribution
New Game Undo Save Load Replay Board Style Show Coach Analyse Help me Edit Boar…
0.019063614946465
Advertisement
0.0062765957446809
div#sparkchess > div#pt > div.ptPlayers > div#ptBlack
0.0054017806399571
Undo Save Load Replay Board Style Show Coach Analyse Help me Edit Board Unmute …
0.0032174703704947
CHESS
0.00037085854155216
Avoid long main-thread tasks — 4 long tasks found
Below is a list of the longest tasks on the main thread, which is useful when identifying the worst input delay contributors.
URL Start Time (Ms) Duration (Ms)
https://tpc.googlesyndication.com/pagead/js/r20221012/r20110914/abg_lite_fy2021.js
1756
92
https://pagead2.googlesyndication.com/bg/ZEudAwKmaTNpvGbgtwbUkI0ybKz2KwCtXmqAoF5myvk.js
2194
82
https://pagead2.googlesyndication.com/bg/ZEudAwKmaTNpvGbgtwbUkI0ybKz2KwCtXmqAoF5myvk.js
1848
81
https://pagead2.googlesyndication.com/bg/ZEudAwKmaTNpvGbgtwbUkI0ybKz2KwCtXmqAoF5myvk.js
2805
76
Avoid non-composited animations — 6 animated elements found
It is recommended to avoid non-composited animations which are often janky and increase CLS.
Element Name
Boris Fast and aggressive, Boris is a powerful opponent for more advanced playe…
Cody Still learning the basics, Cody blunders, making him a good opponent for k…
Claire Your best partner for a quick game during the coffee break, Claire has a…
n
Open
Open
Image elements have explicit `width` and `height`
Reduce layout shifts and improve CLS by setting explicit width and height properties on image elements.
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of sparkchess.com on mobile screens.
Avoids `unload` event listeners
The 'unload' event does not fire reliably, causing issues with browser optimizations such as the Back-Forward Cache. It is recommended that 'pagehide' or 'visibilitychange' events are used instead.

Budgets

Performance budget
It is advised to keep the quantity and size of all network requests under the targets set by the provided performance budget.
Timing budget
It is advised to set a timing budget to monitor the performance of your site.

Metrics

Time to Interactive — 2.7 s
The time taken for the page to become fully interactive.
Speed Index — 1.4 s
The time taken for the page contents to be visibly populated.
Largest Contentful Paint — 1.6 s
The timing of the largest text or image that is painted.

Other

Reduce unused CSS — Potential savings of 85 KiB
Dead and/or unused rules in Style Sheets (CSS) can contribute to network payload sizes. Sparkchess.com should consider removing dead rules from style sheets and deferring the loading of CSS not used for above-the-fold content.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://www.sparkchess.com/res/game/images-low-webp-d7a2a1a12e.css
108889
47235
https://www.sparkchess.com/res/game/sparkchess-6066fdeabf.css
51928
40037
Reduce unused JavaScript — Potential savings of 366 KiB
It is advised to remove unused JavaScript in order to reduce bytes consumed by network activity.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://www.sparkchess.com/res/game/sparkchess-4065fb1670.js
171565
132416
https://imasdk.googleapis.com/js/sdkloader/ima3.js
130471
93570
https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202210100101/show_ads_impl_fy2021.js
128140
82200
https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202210100101/reactive_library_fy2021.js
55796
41885
https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js
55246
24282
Avoid multiple page redirects — Potential savings of 340 ms
Redirects can cause additional delays before the page can begin loading. Sparkchess.com should avoid multiple or unnecessary page redirects.
URL Time Spent (Ms)
http://sparkchess.com/
190
https://sparkchess.com/
150
https://www.sparkchess.com/
0
Serve static assets with an efficient cache policy — 34 resources found
Sparkchess.com can speed up repeat visits by increasing the cache lifetime, which is essentially how long before a cached copy expires.
URL Cache TTL (Ms) Transfer Size (Bytes)
https://www.google-analytics.com/analytics.js
7200000
20664
https://tpc.googlesyndication.com/daca_images/simgad/10974216319174782425?w=180&h=360
604800000
14587
https://tpc.googlesyndication.com/pagead/js/r20221012/r20110914/client/one_click_handler_one_afma_fy2021.js
1209600000
14463
https://tpc.googlesyndication.com/pagead/js/r20221012/r20110914/abg_lite_fy2021.js
1209600000
10371
https://tpc.googlesyndication.com/pagead/js/r20221012/r20110914/abg_lite_fy2021.js
1209600000
10371
https://tpc.googlesyndication.com/pagead/js/r20221012/r20110914/abg_lite_fy2021.js
1209600000
10371
https://tpc.googlesyndication.com/pagead/js/r20221012/r20110914/client/qs_click_protection_fy2021.js
1209600000
8364
https://tpc.googlesyndication.com/pagead/js/r20221012/r20110914/client/qs_click_protection_fy2021.js
1209600000
8364
https://tpc.googlesyndication.com/pagead/js/r20221012/r20110914/client/qs_click_protection_fy2021.js
1209600000
8364
https://tpc.googlesyndication.com/pagead/js/r20221012/r20110914/client/window_focus_fy2021.js
1209600000
2152
https://tpc.googlesyndication.com/pagead/js/r20221012/r20110914/client/window_focus_fy2021.js
1209600000
2152
https://tpc.googlesyndication.com/pagead/js/r20221012/r20110914/client/window_focus_fy2021.js
1209600000
2152
https://tpc.googlesyndication.com/pagead/js/r20221012/r20110914/client/load_preloaded_resource_fy2021.js
1209600000
1668
https://tpc.googlesyndication.com/pagead/js/r20221012/r20110914/client/load_preloaded_resource_fy2021.js
1209600000
1668
https://www.sparkchess.com/res/game/sparkchess-4065fb1670.js
2592000000
171565
https://www.sparkchess.com/res/game/images-low-webp-d7a2a1a12e.css
2592000000
108889
https://www.sparkchess.com/res/game/sparkchess-6066fdeabf.css
2592000000
51928
https://www.sparkchess.com/cms/media/fighting-draws-in-texas-chess-games-1-150x150.jpg
2592000000
10865
https://www.sparkchess.com/cms/media/problem-chess-150x150.jpg
2592000000
10690
https://www.sparkchess.com/cms/media/understanding-pawn-endgames-thm-150x150.jpg
2592000000
9520
https://www.sparkchess.com/cms/media/chess-research-monetary-awards-for-university-students-150x150.jpg
2592000000
8323
https://www.sparkchess.com/res/fonts/icons.woff2
2592000000
8059
https://www.sparkchess.com/cms/media/modern-chess-opening-repertoire-for-white-150x150.jpg
2592000000
6984
https://www.sparkchess.com/cms/media/players/ding-liren-150x150.jpg
2592000000
6069
https://www.sparkchess.com/cms/media/fen/ad632a157c062363bfdfd28d2a1631c0.png
2592000000
2871
https://www.sparkchess.com/cms/media/fen/1695f84a0bea11eba6bacc45792124a0.png
2592000000
2685
https://www.sparkchess.com/cms/media/fen/71333e4026ccf193314e4d99226d468c.png
2592000000
2495
https://www.sparkchess.com/cms/media/fen/2a36e543091ad848a695c1dfdcd22aaa.png
2592000000
2478
https://www.sparkchess.com/cms/media/fen/2243cd23b382a757d9dfb236b9856835.png
2592000000
2268
https://www.sparkchess.com/cms/media/fen/7e79c9fa723d89d90191aa31b745f1d3.png
2592000000
2128
https://www.gstatic.com/mysidia/1d54d8cacad5994e062108e03542c880.js?tag=mysidia_one_click_handler_one_afma_2019
7776000000
14693
https://www.gstatic.com/mysidia/1d54d8cacad5994e062108e03542c880.js?tag=mysidia_one_click_handler_one_afma_2019
7776000000
14693
https://www.gstatic.com/mysidia/cc2fa6f05f6b7ab36f626f2501931c3a.js?tag=client_fast_engine_2019
7776000000
5218
https://www.gstatic.com/mysidia/9a8178d18d321307744a4c8ce46adea2.js?tag=text/vanilla_highlight
7776000000
5199
Avoid an excessive DOM size — 1,323 elements
A large DOM (Document Object Model) will increase memory usage, cause longer system calculations as well as costly layout reflows.
Statistic Element Value
Total DOM Elements
1323
Maximum DOM Depth
span > span.wngIcon > svg > path
16
Maximum Child Elements
div#sparkchess > div#bmc > div#boardManager > div#boardPiecesContainer
65

Other

Reduce the impact of third-party code — Third-party code blocked the main thread for 250 ms
It is advised to either limit, remove or delay the loading of redundant third-party code which may be significantly impacting load performance.
Third-Party Transfer Size (Bytes) Main-Thread Blocking Time (Ms)
SHOW DETAILS
736728
251.531
SHOW DETAILS
133060
0
SHOW DETAILS
39803
0
SHOW DETAILS
21261
0
SHOW DETAILS
1672
0
Does not use passive listeners to improve scrolling performance
Improve the page's scroll performance by marking touch and wheel event listeners as 'passive'.
Source
SHOW DETAILS
SHOW DETAILS
Avoid `document.write()`
Avoid or limit the use of external scripts that are dynamically injected via 'document.write()' as users on slow connections will be delayed by tens of seconds.
Source
SHOW DETAILS
SHOW DETAILS
SHOW DETAILS
SHOW DETAILS
90

Accessibility

Indicates how accessible the page is and highlights opportunities where the page can be made more accessible to users of sparkchess.com. This includes details about various page attributes that can be optimized.

Navigation

`[accesskey]` values are unique
Access keys assist users with focusing on different parts of the page. Each access key should be unique for proper navigation.
The page contains a heading, skip link, or landmark region
It is advised to provide ways to bypass repetitive content, allowing users to navigate the page efficiently.
`[id]` attributes on active, focusable elements are unique
Ensure all focusable elements have a unique id value to allow them to be visible to users of assistive technologies, like a screen reader.
Heading elements appear in a sequentially-descending order
Properly order all headers and do not skip heading levels to better the navigation and readability for users of assistive technologies, like a screen reader.
No element has a `[tabindex]` value greater than 0
Although technically valid, a tabindex value greater than 0 often creates frustrating experiences for users who rely on assistive technologies.

ARIA

`button`, `link`, and `menuitem` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[aria-hidden="true"]` is not present on the document `<body>`
If aria-hidden=true is set on the document body, assistive technologies, like a screen reader will work inconsistently.
`[aria-hidden="true"]` elements do not contain focusable descendents
Interactive elements within an aria-hidden=true element are unavailable to users of assistive technologies, like a screen reader.
ARIA input fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when an input field does not have an accessible name specified.
ARIA `meter` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
ARIA `progressbar` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[role]`s have all required `[aria-*]` attributes
Some ARIA roles have required 'aria-*' attributes, which provide essential information about state and functionality.
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
Some ARIA parent roles cannot perform their intended functions if specific child roles are not used.
`[role]`s are contained by their required parent element
Some ARIA child roles cannot perform their intended functions if specific parent roles are not used.
`[role]` values are valid
All ARIA roles require valid values to perform their intended functions.
ARIA toggle fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when a toggle field does not have an accessible name specified.
ARIA `tooltip` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
ARIA `treeitem` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[aria-*]` attributes have valid values
ARIA attributes cannot be interpreted with invalid values when used by screen readers and other assistive technologies.
`[aria-*]` attributes are valid and not misspelled
ARIA attributes cannot be interpreted with invalid names when used by screen readers and other assistive technologies.
ARIA IDs are unique
Ensure all ARIA ID values are unique to prevent elements from being overlooked by assistive technologies, like a screen reader.

Names and labels

Buttons have an accessible name
Buttons become unusable as they are announced simply as "button" when the button does not have an accessible name, when used by screen readers and other assistive technologies.
Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
No form fields have multiple labels
Having multiple labels for form fields can be confusing to assistive technologies, like a screen reader.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
`<input type="image">` elements have `[alt]` text
Input buttons with alternative text assist screen readers and other assistive technology users to understand its purpose.
Form elements have associated labels
Screen readers and other assistive technologies rely on labels to properly announce form controls.
Links have a discernible name
In order to improve the navigation for screen reader and other assistive technology users, use link text that is unique, focusable and discernible.
`<object>` elements have alternate text
It is advised that alt text is used on '<object>' elements in order to provide meaning to screen reader and other assistive technology users, as these technologies are unable to translate non-text content.

Contrast

Background and foreground colors have a sufficient contrast ratio
Many (if not most) users find low-contrast text difficult or impossible to read.

Tables and lists

`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
Screen readers and other assistive technologies may produce poor and inaccurate output when definition lists are not properly marked up.
Definition list items are wrapped in `<dl>` elements
In order for screen readers and other assistive technologies to properly announce definition list items ('<dt>' and '<dd>'), they must be wrapped in parent a '<dl>' element.
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
Use proper list structure to aid screen readers and other assistive technologies.
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
In order for screen readers to announce list items, ensure that list items ('<li>') are contained within parent '<ul>' or '<ol>' tags.
Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that '<td>' cells using the headers attribute only refer to other cells in the same table, to improve screen reader user experience.
`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that table headers refer to some set of cells, to improve screen reader user experience.

Internationalization and localization

`<html>` element has a `[lang]` attribute
It is advised to provide a lang attribute so that screen readers and other assistive technologies are guaranteed to announce the page's text correctly. When not provided, the user's default language setting will be used which may cause inaccuracies.
`<html>` element has a valid value for its `[lang]` attribute
Specify a valid BCP 47 language in order to help screen readers and other assistive technologies announce text properly.
`[lang]` attributes have a valid value
Specify a valid BCP 47 language on elements in order to help screen readers and other assistive technologies announce text properly.

Best practices

The document does not use `<meta http-equiv="refresh">`
Pages that refresh automatically cause a poor user experience as focus is directed back to the top of the page unexpectedly.
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
For users with low vision who rely on screen magnification, ensure that zooming is not disabled.

Audio and video

`<video>` elements contain a `<track>` element with `[kind="captions"]`
Sparkchess.com may provide assistance to deaf or hearing-impaired users with captions on videos.

ARIA

`[aria-*]` attributes do not match their roles
Avoid mismatching 'aria-*' attributes and their 'role' value, as it invalidates the attribute.
Failing Elements
Advertisement
Advertisement
Advertisement

Names and labels

`<frame>` or `<iframe>` elements do not have a title
Screen reader users and other assistive technology users rely on frame titles to describe the contents of frames.
Failing Elements
div#bnr1 > ins.adsbygoogle > div#aswift_0_host > iframe#aswift_0
div#bnr2 > ins.adsbygoogle > div#aswift_1_host > iframe#aswift_1
body > ins.adsbygoogle > div#aswift_3_host > iframe#aswift_3

Manual Checks

The page has a logical tab order
The visual layout should be logical in its tab order and users cannot focus elements that are offscreen.
Interactive controls are keyboard focusable
Ensure that custom interactive controls are keyboard focusable and that a focus indicator is displayed.
Interactive elements indicate their purpose and state
Ensure that interactive elements (such as links and buttons) are distinguishable from non-interactive elements and that they indicate their state.
The user's focus is directed to new content added to the page
When new content (such as a dialogue) is added to the page, the user's focus should be directed to it.
User focus is not accidentally trapped in a region
Avoid focus being accidentally trapped when a user tabs in and out of controls or regions on page.
Custom controls have associated labels
Ensure that custom interactive controls have associated labels, which are provided by aria-label and aria-labelledby attributes.
Custom controls have ARIA roles
Ensure that all custom interactive controls have appropriate ARIA roles.
Visual order on the page follows DOM order
Ensure that the DOM order matches with the page's visual order, in order to improve navigation for screen readers and other assistive technologies.
Offscreen content is hidden from assistive technology
Ensure that offscreen content is hidden through the use of "display:none" styling or the aria-hidden attribute.
HTML5 landmark elements are used to improve navigation
Elements such as <main> and <nav> are recommended as they are used by screen readers and other assistive technologies to improve keyboard navigation.
92

Best Practices

Indicates the recommended, best practices currently in place on the page and highlights the best practices that sparkchess.com should incorporate. This includes practices such as protecting pages with HTTPS.

Audits

Avoids requesting the geolocation permission on page load
When requesting a user's location, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Avoids requesting the notification permission on page load
When requesting permission to send notifications, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Avoids front-end JavaScript libraries with known security vulnerabilities
Ensure that the use of third-party scripts is minimal and that only trusted third-party scripts are used as some may contain known security vulnerabilities which may be exploited by attackers.
Ensure CSP is effective against XSS attacks
Significantly reduce the risk of cross-site scripting attacks (XSS) by ensuring you have a strong Content Security Policy (CSP).
Description Directive Severity
No CSP found in enforcement mode
High

Audits

Allows users to paste into password fields
Ensure that password inputs may be pasted into to aid in the user's ability to use password managers and improve security.
Displays images with correct aspect ratio
Ensure that image display dimensions match their natural aspect ratio.
Serves images with appropriate resolution
For maximum image clarity, ensure images have natural dimensions and are proportional to the display size and pixel ratio.
Fonts with `font-display: optional` are preloaded
It is recommended that optional fonts are preloaded.

Audits

Page has the HTML doctype
Ensure a doctype is specified to prevent the browser from switching to quirks-mode.
Properly defines charset
It is advised to declare a character encoding, optionally via a <meta> tag in the first 1024 bytes of the HTML or in the Content-Type HTTP response header.

Audits

Detected JavaScript libraries
Below is a list of all front-end JavaScript libraries that were detected on the page.
Name Version
Socket.IO
Workbox
3.6.1
Avoids deprecated APIs
Avoid deprecated APIs which will eventually be removed the browser.
No browser errors logged to the console
Below is a list of all errors logged to the console, which indicate unresolved problems on the site.
Page has valid source maps
Consider deploying source maps for added benefits such as the ability to debug while in production.
URL Map URL
https://pagead2.googlesyndication.com/bg/ZEudAwKmaTNpvGbgtwbUkI0ybKz2KwCtXmqAoF5myvk.js
No issues in the `Issues` panel in Chrome Devtools
There may be unresolved issues logged to Chrome Devtools.

Audits

Does not use HTTPS — 1 insecure request found
Ensure that all pages are protected with HTTPS (including those that do not handle sensitive data) as HTTPS prevents tampering and passive listening on communications between the app and its users. Additionally, HTTPS is a prerequisite for HTTP/2 and many new web platform APIs.
Insecure URL Request Resolution
http://sparkchess.com/
Allowed
100

SEO

Indicates how well the page is optimized for ranking in search engines and highlights Search Engine Optimization (SEO) opportunities for sparkchess.com. This includes optimizations such as providing meta data.

Mobile Friendly

Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of sparkchess.com on mobile screens.
Document uses legible font sizes
Font sizes of 12px or less are too small to most mobile users without user gestures and further action. Aim for more than 60% of page text to use font sizes greater than 12px.
Tap targets are sized appropriately
Interactive elements (such as buttons and links) should be appropriately spaced, sized and easy enough to select or tap with regard to their surrounding elements.

Content Best Practices

Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
Document has a meta description
Meta descriptions may be used by search engines when displaying a link to the page and should concisely summarize the page's content.
Links have descriptive text
Make use of descriptive link text to assist search engines in understanding the content.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
Document has a valid `hreflang`
Search engines can be instructed to list specific versions of a page for a given language or region through the use of hreflang links.
Document has a valid `rel=canonical`
Search engines can be suggested which URL should be shown in search results through the use of canonical links.
Document avoids plugins
The content of plugins cannot be indexed by search engines and many devices either restrict or do not support them.

Crawling and Indexing

Page has successful HTTP status code
Avoid pages with unsuccessful HTTP status codes as they may not be indexed by search engines.
Links are crawlable
Ensure that the 'href' attribute of anchor elements links to the appropriate destination. This allows for more pages of the site to be discovered by search engines.
Page isn’t blocked from indexing
Pages that cannot be crawled by search engines cannot be indexed or included in their search results. Ensure that search engines have permission to crawl all pages that should be indexed.
robots.txt is valid
Malformed robots.txt files prevent crawlers from understanding how a site wants to be crawled or indexed, which can be devastating to SEO.

Manual Checks

Structured data is valid
Structured data can be validated through the use of the Structured Data Testing Tool and the Structured Data Linter.
89

PWA

Indicates how valid the aspects of a Progressive Web App (PWA) are for the page and highlights opportunities to enable/improve the PWA of sparkchess.com. This includes details about web app manifests.

Installable

Web app manifest and service worker meet the installability requirements
User engagement may be increased by leveraging the browsers ability to proactively prompt users to add the app to their homescreen.

PWA Optimized

Registers a service worker that controls page and `start_url`
A service worker is used to provide Progressive Web Apps the use of features such as working offline, the ability for the app to be added to the homescreen as well as push notifications.
Configured for a custom splash screen
Themed splash screens ensure a high-quality user experience at launch for app users.
View Data
Sets a theme color for the address bar.
A theme may be applied to the browser address bar, which ideally can be made to match the site.
View Data
Content is sized correctly for the viewport
Ensure that the width of the app's content matches the width of the viewport, otherwise the app might not be optimized for mobile screens.
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of sparkchess.com on mobile screens.
Provides a valid `apple-touch-icon`
iOS users of Progressive Web Apps will benefit from an apple touch icon, which can be defined with 'apple-touch-icon', which must point to a non-transparent 192px (or 180px) square PNG.

PWA Optimized

Manifest doesn't have a maskable icon
Maskable icons are great to ensure that images fill the entire shape when installing the app on a device.

Manual Checks

Site works cross-browser
Ensure that the Progressive Web App works correctly across every major browser.
Page transitions don't feel like they block on the network
Users perceive apps with responsive, snappy transitions as higher peforming and ensures a great user experience, even on a slow network.
Each page has a URL
Ensure that all pages are deep linkable via URL. They should also be unique for the purpose of shareability on social media.
Avg. (All Categories) 89
Performance 74
Accessibility 90
Best Practices 92
SEO 98
PWA 90
0–49 (Fail) 50–89 (Average) 90–100 (Pass)
URL: https://www.sparkchess.com/
Updated: 17th October, 2022

1.53 seconds
First Contentful Paint (FCP)
81%
11%
8%

0.03 seconds
First Input Delay (FID)
90%
7%
3%

Simulate loading on mobile
74

Performance

Indicates how well the page is performing and highlights opportunities where performance may be improved for sparkchess.com. This includes details about optimizing page load times which can result in a better user experience.

Metrics

Largest Contentful Paint — 2.5 s
The timing of the largest text or image that is painted.
Cumulative Layout Shift — 0
Cumulative Layout Shift is the measurement of visible elements collective movement within the viewport.
View Data

Other

Properly size images
Images can slow down the page's load time. Sparkchess.com should consider serving more appropriate-sized images.
Defer offscreen images — Potential savings of 2 KiB
Time to Interactive can be slowed down by resources on the page. Sparkchess.com should consider lazy-loading offscreen and hidden images.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://www.sparkchess.com/cms/media/fen/ad632a157c062363bfdfd28d2a1631c0.png
2102
2102
Minify CSS
Cascading Style Sheets (CSS) files can contribute to network payload sizes. Sparkchess.com should consider minifying CSS files.
Minify JavaScript
JavaScript (JS) files can contribute to network payload sizes and increase script parse times. Sparkchess.com should consider minifying JS files.
Efficiently encode images
Unoptimized images can consume more cellular data than what is necessary.
Serve images in next-gen formats — Potential savings of 12 KiB
Consider JPEG 2000, JPEG XR or WebP image formats which provide better compression than PNG and JPEG.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://www.sparkchess.com/cms/media/understanding-pawn-endgames-thm.jpg
26266
12418.2
Enable text compression
Text-based resources should be served with compression, such as gzip, deflate or brotli.
Preconnect to required origins
Resource hints, such as 'preconnect' or 'dns-prefetch', may assist in establishing early connections to important third-party origins.
Initial server response time was short — Root document took 70 ms
It is advised to keep the server response time short for the main document, because all other requests depend on it.
URL Time Spent (Ms)
https://www.sparkchess.com/
74.669
Preload key requests
Key requests can be preloaded by using '<link rel=preload>'. Sparkchess.com should consider using '<link rel=preload>' to prioritize fetching resources that are currently requested later in page load.
Use video formats for animated content
Large GIFs are inefficient for delivering animated content. It is recommended to use MPEG4/WebM videos for animations and PNG/WebP for static images instead of GIF.
Remove duplicate modules in JavaScript bundles
Ensure that no duplicate JavaScript modules from bundles exist to reduce bytes consumed by network activity.
Avoid serving legacy JavaScript to modern browsers
Polyfills and transforms enable legacy browsers to use new JavaScript features. For bundled JavaScript it is recommended to adopt a modern script deployment strategy using module/nomodule feature detection. This will reduce the amount of code shipped to modern browsers.
Preload Largest Contentful Paint image
It is recommended to preload images used by LCP elements, to improve LCP time.
Avoids enormous network payloads — Total size was 844 KiB
Large network payloads can cost users money and are linked to long load times.
URL Transfer Size (Bytes)
https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202210100101/show_ads_impl_fy2021.js
128145
https://www.sparkchess.com/res/game/images-low-webp-d7a2a1a12e.css
108897
https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202210100101/reactive_library_fy2021.js
55801
https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js
55133
https://www.sparkchess.com/res/game/sparkchess-6066fdeabf.css
51938
https://www.googletagservices.com/activeview/js/current/rx_lidar.js?cache=r20110914
48335
https://www.googletagservices.com/activeview/js/current/rx_lidar.js?cache=r20110914
48335
https://fonts.gstatic.com/s/googlesans/v45/4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iqcsih3SAyH6cAwhX9RPjIUvbQoi-E.woff2
29296
https://www.sparkchess.com/cms/media/understanding-pawn-endgames-thm.jpg
27057
https://googleads.g.doubleclick.net/pagead/ads?client=ca-pub-1185411301591128&output=html&adk=1812271804&adf=3025194257&lmt=1665755969&plat=16%3A8388608%2C17%3A32%2C24%3A32%2C25%3A32%2C32%3A32&format=0x0&url=https%3A%2F%2Fwww.sparkchess.com%2F&ea=0&pra=7&wgl=1&easpi=0&asntp=0&asntpv=0&asntpl=0&asntpm=0&asntpc=0&asna=5&asnd=5&asnp=5&asns=5&asmat=1&asptt=-1&uach=WyJBbmRyb2lkIiwiNi4wIiwiIiwiTW90byBHNCIsIjk4LjAuNDY5NS4wIixbXSx0cnVlLG51bGwsIiIsW10sZmFsc2Vd&dt=1666033292702&bpp=3&bdt=251&idt=114&shv=r20221013&mjsv=m202210100101&ptt=9&saldr=aa&abxe=1&prev_fmts=360x300&nras=1&correlator=1407107909380&frm=20&pv=1&ga_vid=1069419981.1666033293&ga_sid=1666033293&ga_hid=2088446711&ga_fc=1&u_tz=-420&u_his=2&u_h=640&u_w=360&u_ah=640&u_aw=360&u_cd=24&u_sd=2.625&dmc=8&adx=-12245933&ady=-12245933&biw=360&bih=640&scr_x=0&scr_y=0&eid=44759876%2C44759927%2C44759842%2C44774649%2C42531706%2C44774653%2C44770881%2C31068920&oid=2&pvsid=2192127594825188&tmod=1284784955&uas=0&nvt=1&eae=2&fc=896&brdim=0%2C0%2C0%2C0%2C360%2C0%2C360%2C640%2C360%2C640&vis=1&rsz=%7C%7Cs%7C&abl=NS&fu=32768&bc=31&ifi=2&uci=a!2&fsb=1&dtd=123
25018
Avoid chaining critical requests — 3 chains found
Below is a list of Critical Request Chains, which shows which resources are loaded with a high priority. Sparkchess.com should consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.
User Timing marks and measures
Make use of the User Timing API to measure an app's real-world performance during key user experiences.
Keep request counts low and transfer sizes small — 64 requests • 844 KiB
It is advised to add a budgets.json file in order to set budgets for the quantity and size of page resources.
Resource Type Requests Transfer Size (Bytes)
Total
64
864731
Script
21
457215
Stylesheet
4
164179
Image
18
103036
Document
11
86491
Font
2
37361
Other
8
16449
Media
0
0
Third-party
46
586855
Lazy load third-party resources with facades
Consider replacing third-party embeds with a facade until they are required (use lazy loading).
Largest Contentful Paint element — 1 element found
The element which was identified as the Largest Contentful Paint.
Element
Tap to Play
Largest Contentful Paint image was not lazily loaded
Above-the-fold images that are lazily loaded render later in the page lifecycle, which can delay the largest contentful paint.
Avoid large layout shifts — 2 elements found
Below is a list of all DOM elements that contribute to the CLS of the page.
Element CLS Contribution
Find Oracle Netsuite Erp
0.00088356481481481
SPARK
9.6605088975694E-5
Avoid long main-thread tasks — 13 long tasks found
Below is a list of the longest tasks on the main thread, which is useful when identifying the worst input delay contributors.
URL Start Time (Ms) Duration (Ms)
https://tpc.googlesyndication.com/pagead/js/r20221012/r20110914/abg_lite_fy2021.js
9434
303
https://www.googletagservices.com/activeview/js/current/rx_lidar.js?cache=r20110914
7304
170
https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202210100101/show_ads_impl_fy2021.js
5772
95
https://tpc.googlesyndication.com/sodar/sodar2/225/runner.html
6991
85
https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js
3616
79
https://www.sparkchess.com/
2217
74
https://www.google-analytics.com/analytics.js
3120
73
https://tpc.googlesyndication.com/sodar/sodar2/225/runner.html
7076
73
https://www.sparkchess.com/
2147
70
https://tpc.googlesyndication.com/sodar/sodar2/225/runner.html
7149
57
https://tpc.googlesyndication.com/sodar/sodar2/225/runner.html
6935
56
https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202210100101/reactive_library_fy2021.js
8322
52
https://googleads.g.doubleclick.net/pagead/html/r20221013/r20110914/zrt_lookup.html?fsb=1#RS-0-&adk=1812271802&client=ca-pub-1185411301591128&fa=2&ifi=3&uci=a!3&btvi=1&xpc=leZOx3As8r&p=https%3A//www.sparkchess.com
7253
51
Avoid non-composited animations
It is recommended to avoid non-composited animations which are often janky and increase CLS.
Image elements have explicit `width` and `height`
Reduce layout shifts and improve CLS by setting explicit width and height properties on image elements.
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of sparkchess.com on mobile screens.
Avoids `unload` event listeners
The 'unload' event does not fire reliably, causing issues with browser optimizations such as the Back-Forward Cache. It is recommended that 'pagehide' or 'visibilitychange' events are used instead.

Budgets

Performance budget
It is advised to keep the quantity and size of all network requests under the targets set by the provided performance budget.
Timing budget
It is advised to set a timing budget to monitor the performance of your site.

Audits

Network Requests
Below is a list of network requests that were made during page load.
URL Protocol Start Time (Ms) End Time (Ms) Transfer Size (Bytes) Resource Size (Bytes) Status Code MIME Type Resource Type
http://sparkchess.com/
http/1.1
0
72.445999947377
726
0
301
text/plain
https://sparkchess.com/
http/1.1
72.781999944709
194.37299994752
745
0
301
text/html
https://www.sparkchess.com/
h2
194.69299993943
268.36699992418
22596
83826
200
text/html
Document
https://www.sparkchess.com/res/game/images-low-webp-d7a2a1a12e.css
h2
278.54199998546
434.78999997023
108897
150724
200
text/css
Stylesheet
https://www.sparkchess.com/res/game/sparkchess-6066fdeabf.css
h2
278.69800000917
323.19699996151
51938
105909
200
text/css
Stylesheet
https://www.sparkchess.com/cms/media/fen/1695f84a0bea11eba6bacc45792124a0.png
h2
324.73200000823
354.74099998828
2683
1918
200
image/png
Image
https://www.sparkchess.com/cms/media/fen/2a36e543091ad848a695c1dfdcd22aaa.png
h2
329.6219999902
367.28099989705
2480
1711
200
image/png
Image
https://www.sparkchess.com/cms/media/fen/71333e4026ccf193314e4d99226d468c.png
h2
329.86499997787
388.82999995258
2497
1732
200
image/png
Image
https://www.sparkchess.com/cms/media/fen/2243cd23b382a757d9dfb236b9856835.png
h2
330.18399996217
397.53299998119
2270
1497
200
image/png
Image
https://www.sparkchess.com/cms/media/fen/7e79c9fa723d89d90191aa31b745f1d3.png
h2
330.43899992481
369.73299994133
2122
1359
200
image/png
Image
https://www.sparkchess.com/cms/media/fen/ad632a157c062363bfdfd28d2a1631c0.png
h2
330.58499998879
370.22899999283
2867
2102
200
image/png
Image
https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js
h2
331.05599996634
369.08099998254
55133
167709
200
text/javascript
Script
https://www.google-analytics.com/analytics.js
h2
331.17399993353
339.43299995735
20664
50230
200
text/javascript
Script
https://www.sparkchess.com/res/fonts/icons.woff2
h2
336.14099991973
371.31199997384
8065
7244
200
application/octet-stream
Font
data
335.82599996589
352.17699990608
10052
10052
200
font/woff
Font
data
336.2119999947
353.78399991896
29040
29040
200
font/woff
Font
data
351.54599999078
351.63199994713
0
26
200
image/gif
Image
data
381.46499998402
381.55699998606
0
266
200
image/svg+xml
Image
https://www.sparkchess.com/cms/media/understanding-pawn-endgames-thm.jpg
h2
441.3619999541
486.31899990141
27057
26266
200
image/jpeg
Image
https://www.sparkchess.com/cms/media/problem-chess-150x150.jpg
h2
441.4729999844
476.73100000247
10686
9898
200
image/jpeg
Image
https://www.sparkchess.com/cms/media/modern-chess-opening-repertoire-for-white-150x150.jpg
h2
441.7259999318
477.0220000064
6978
6196
200
image/jpeg
Image
https://www.sparkchess.com/cms/media/chess-research-monetary-awards-for-university-students-150x150.jpg
h2
441.88399997074
479.09599996638
8325
7537
200
image/jpeg
Image
https://www.sparkchess.com/cms/media/fighting-draws-in-texas-chess-games-1-150x150.jpg
h2
442.1339998953
477.3559999885
10869
10078
200
image/jpeg
Image
https://www.sparkchess.com/cms/media/players/ding-liren-150x150.jpg
h2
442.41399993189
485.24199996609
6075
5285
200
image/jpeg
Image
https://stats.g.doubleclick.net/j/collect?t=dc&aip=1&_r=3&v=1&_v=j98&tid=UA-153081-9&cid=1069419981.1666033293&jid=468439734&gjid=1559207798&_gid=940414250.1666033293&_u=YGBAgEABAAAAAEAAI~&z=224780437
h2
469.1509999102
479.82000000775
689
1
200
text/plain
XHR
https://www.google-analytics.com/collect?v=1&_v=j98&aip=1&a=2088446711&t=pageview&_s=1&dl=https%3A%2F%2Fwww.sparkchess.com%2F&ul=en-us&de=UTF-8&dt=SparkChess%3A%20Play%20chess%20online%20vs%20the%20computer%20or%20in%20multiplayer&sd=24-bit&sr=360x640&vp=360x640&je=0&_u=YGBAgEABAAAAAAAAI~&jid=468439734&gjid=1559207798&cid=1069419981.1666033293&tid=UA-153081-9&_gid=940414250.1666033293&z=1334520487
h2
469.62599991821
476.33999993559
597
35
200
image/gif
Image
https://googleads.g.doubleclick.net/pagead/html/r20221013/r20190131/zrt_lookup.html
h2
491.15499993786
499.96599997394
5174
9849
200
text/html
Document
https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202210100101/show_ads_impl_fy2021.js
h2
518.59499991406
561.64199998602
128145
360758
200
text/javascript
Script
https://partner.googleadservices.com/gampad/cookie.js?domain=www.sparkchess.com&callback=_gfp_s_&client=ca-pub-1185411301591128&gpid_exp=1
h2
608.53899992071
622.37299990375
895
395
200
text/javascript
Script
https://adservice.google.com/adsid/integrator.js?domain=www.sparkchess.com
h2
611.55999999028
625.39199995808
758
107
200
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Fetch
Network Round Trip Times — 0 ms
High Network RTT (Round Trip Times) can have a large impact on performance. Providing servers geographically closer to the user could improve performance.
Server Backend Latencies — 0 ms
High server latencies indicate the server is overloaded or has a poor backend performance.
Tasks
Below is a list of the top-level main thread tasks that executed during page load.
Start Time (Ms) End Time (Ms)
272.322
11.4
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18.894
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11.652
372.016
34.825
407.005
36.771
452.678
18.25
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13.968
797.832
21.143
819.909
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826.076
18.198
845.116
14.315
861.06
11.8
873.86
9.103
883.484
7.44
1105.476
6.139
1115.168
8.14
1163.126
26.069
1191.778
5.764
1199.151
12.784
1226.916
5.182
1236.933
5.111
1243.763
42.505
1321.706
5.583
1340.339
75.859
1416.3
11.27
1433.75
5.529
1441.109
10.166
1461.146
5.554
1475.913
5.297
1486.574
12.248
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6.739
Diagnostics
Below is a collection of useful page vitals.
View Data
Metrics
Below is a collection of metrics.
View Data
Script Treemap Data
Provide as required, for treemap app.

Metrics

First Contentful Paint — 2.5 s
The time taken for the first image or text on the page to be rendered.
Speed Index — 4.2 s
The time taken for the page contents to be visibly populated.
Total Blocking Time — 470 ms
The total blocking time is the sum of all time periods between First Contentful Paint and Time to Interactive (when task length exceeded 50ms).

Audits

First Meaningful Paint — 3.2 s
The time taken for the primary content of the page to be rendered.

Other

Eliminate render-blocking resources — Potential savings of 410 ms
Resources, such as JavaScript and style sheets, can block the first paint of the page. Sparkchess.com should consider delivering critical JavaScript/style sheets (JS/CSS) inline and deferring all non-critical JS/CSS.
URL Transfer Size (Bytes) Potential Savings (Ms)
https://www.sparkchess.com/res/game/sparkchess-6066fdeabf.css
51938
450
Reduce unused CSS — Potential savings of 38 KiB
Dead and/or unused rules in Style Sheets (CSS) can contribute to network payload sizes. Sparkchess.com should consider removing dead rules from style sheets and deferring the loading of CSS not used for above-the-fold content.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://www.sparkchess.com/res/game/sparkchess-6066fdeabf.css
51938
39277
Serve static assets with an efficient cache policy — 26 resources found
Sparkchess.com can speed up repeat visits by increasing the cache lifetime, which is essentially how long before a cached copy expires.
URL Cache TTL (Ms) Transfer Size (Bytes)
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2592000000
2122
https://www.gstatic.com/mysidia/fed584b8ce81e04d8838584f2ea59ee6.js?tag=mysidia_one_click_handler_one_afma_2019
7776000000
14694
https://www.gstatic.com/mysidia/1d54d8cacad5994e062108e03542c880.js?tag=mysidia_one_click_handler_one_afma_2019
7776000000
14693
Avoid an excessive DOM size — 959 elements
A large DOM (Document Object Model) will increase memory usage, cause longer system calculations as well as costly layout reflows.
Statistic Element Value
Total DOM Elements
959
Maximum DOM Depth
span > span.wngIcon > svg > path
16
Maximum Child Elements
^ Choose an activity Learn Study chess with interactive lessons, solve puzzles …
24
Reduce JavaScript execution time — 2.0 s
JavaScript (JS) execution time can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
URL Total CPU Time (Ms) Script Evaluation (Ms) Script Parse (Ms)
https://www.sparkchess.com/
616.404
54.988
11.14
https://tpc.googlesyndication.com/sodar/sodar2/225/runner.html
611.328
573.716
6.604
https://www.googletagservices.com/activeview/js/current/rx_lidar.js?cache=r20110914
465.852
412.648
43.348
Unattributable
375.776
24.028
0.688
https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202210100101/show_ads_impl_fy2021.js
248.476
209.932
9.336
https://googleads.g.doubleclick.net/pagead/ads?client=ca-pub-1185411301591128&output=html&h=300&slotname=2576818895&adk=3454623700&adf=2169075639&pi=t.ma~as.2576818895&w=360&lmt=1665755969&rafmt=1&format=360x300&url=https%3A%2F%2Fwww.sparkchess.com%2F&fwr=1&fwrattr=true&rpe=1&resp_fmts=3&sfro=1&wgl=1&uach=WyJBbmRyb2lkIiwiNi4wIiwiIiwiTW90byBHNCIsIjk4LjAuNDY5NS4wIixbXSx0cnVlLG51bGwsIiIsW10sZmFsc2Vd&dt=1666033292696&bpp=6&bdt=245&idt=78&shv=r20221013&mjsv=m202210100101&ptt=9&saldr=aa&abxe=1&correlator=1407107909380&frm=20&pv=2&ga_vid=1069419981.1666033293&ga_sid=1666033293&ga_hid=2088446711&ga_fc=1&u_tz=-420&u_his=2&u_h=640&u_w=360&u_ah=640&u_aw=360&u_cd=24&u_sd=2.625&dmc=8&adx=0&ady=60&biw=360&bih=640&scr_x=0&scr_y=0&eid=44759876%2C44759927%2C44759842%2C44774649%2C42531706%2C44774653%2C44770881%2C31068920&oid=2&pvsid=2192127594825188&tmod=1284784955&uas=0&nvt=1&eae=0&fc=896&brdim=0%2C0%2C0%2C0%2C360%2C0%2C360%2C640%2C360%2C640&vis=1&rsz=%7C%7CpeE%7C&abl=CS&pfx=0&fu=128&bc=31&ifi=1&uci=a!1&fsb=1&xpc=3ZlHUaz06l&p=https%3A//www.sparkchess.com&dtd=103
159.736
22.328
11.056
https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js
144.3
127.704
4.108
https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202210100101/reactive_library_fy2021.js
107.688
86.644
4.48
https://googleads.g.doubleclick.net/pagead/drt/si?st=NO_DATA
97.476
17.872
13.144
https://googleads.g.doubleclick.net/pagead/html/r20221013/r20110914/zrt_lookup.html?fsb=1#RS-0-&adk=1812271802&client=ca-pub-1185411301591128&fa=2&ifi=3&uci=a!3&btvi=1&xpc=leZOx3As8r&p=https%3A//www.sparkchess.com
80.796
39.608
13.424
https://www.google-analytics.com/analytics.js
76.684
70.332
2.016
https://pagead2.googlesyndication.com/bg/ZEudAwKmaTNpvGbgtwbUkI0ybKz2KwCtXmqAoF5myvk.js
73.116
67.852
4.14
https://tpc.googlesyndication.com/pagead/js/r20221012/r20110914/abg_lite_fy2021.js
58.588
43.008
6.296
https://tpc.googlesyndication.com/sodar/sodar2.js
58.244
52.632
0.812
https://googleads.g.doubleclick.net/pagead/ads?client=ca-pub-1185411301591128&output=html&adk=1812271804&adf=3025194257&lmt=1665755969&plat=16%3A8388608%2C17%3A32%2C24%3A32%2C25%3A32%2C32%3A32&format=0x0&url=https%3A%2F%2Fwww.sparkchess.com%2F&ea=0&pra=7&wgl=1&easpi=0&asntp=0&asntpv=0&asntpl=0&asntpm=0&asntpc=0&asna=5&asnd=5&asnp=5&asns=5&asmat=1&asptt=-1&uach=WyJBbmRyb2lkIiwiNi4wIiwiIiwiTW90byBHNCIsIjk4LjAuNDY5NS4wIixbXSx0cnVlLG51bGwsIiIsW10sZmFsc2Vd&dt=1666033292702&bpp=3&bdt=251&idt=114&shv=r20221013&mjsv=m202210100101&ptt=9&saldr=aa&abxe=1&prev_fmts=360x300&nras=1&correlator=1407107909380&frm=20&pv=1&ga_vid=1069419981.1666033293&ga_sid=1666033293&ga_hid=2088446711&ga_fc=1&u_tz=-420&u_his=2&u_h=640&u_w=360&u_ah=640&u_aw=360&u_cd=24&u_sd=2.625&dmc=8&adx=-12245933&ady=-12245933&biw=360&bih=640&scr_x=0&scr_y=0&eid=44759876%2C44759927%2C44759842%2C44774649%2C42531706%2C44774653%2C44770881%2C31068920&oid=2&pvsid=2192127594825188&tmod=1284784955&uas=0&nvt=1&eae=2&fc=896&brdim=0%2C0%2C0%2C0%2C360%2C0%2C360%2C640%2C360%2C640&vis=1&rsz=%7C%7Cs%7C&abl=NS&fu=32768&bc=31&ifi=2&uci=a!2&fsb=1&dtd=123
57.828
18.736
13.332
Minimize main-thread work — 3.4 s
Main-thread work timing can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
Category Time Spent (Ms)
Script Evaluation
1919.476
Other
598.612
Style & Layout
390.724
Script Parsing & Compilation
171.224
Rendering
139.868
Parse HTML & CSS
138.672
Garbage Collection
88.52

Metrics

Time to Interactive — 9.1 s
The time taken for the page to become fully interactive.

Audits

Max Potential First Input Delay — 300 ms
Users could experience a delay when interacting with the page.

Other

Reduce unused JavaScript — Potential savings of 166 KiB
It is advised to remove unused JavaScript in order to reduce bytes consumed by network activity.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202210100101/show_ads_impl_fy2021.js
128145
81563
https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202210100101/reactive_library_fy2021.js
55801
43467
https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js
55133
23836
https://www.googletagservices.com/activeview/js/current/rx_lidar.js?cache=r20110914
48335
20687
Avoid multiple page redirects — Potential savings of 1,110 ms
Redirects can cause additional delays before the page can begin loading. Sparkchess.com should avoid multiple or unnecessary page redirects.
URL Time Spent (Ms)
http://sparkchess.com/
630
https://sparkchess.com/
480
https://www.sparkchess.com/
0
Ensure text remains visible during webfont load
Make use of the font-display CSS feature, which will ensure text is user-visible while webfonts are loading.
URL Potential Savings (Ms)
https://fonts.gstatic.com/s/googlesans/v45/4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iqcsih3SAyH6cAwhX9RPjIUvbQoi-E.woff2
6.8900000769645
Reduce the impact of third-party code — Third-party code blocked the main thread for 410 ms
It is advised to either limit, remove or delay the loading of redundant third-party code which may be significantly impacting load performance.
Third-Party Transfer Size (Bytes) Main-Thread Blocking Time (Ms)
SHOW DETAILS
501004
393.232
SHOW DETAILS
21261
16.62
SHOW DETAILS
32640
0
SHOW DETAILS
29387
0
SHOW DETAILS
2563
0
Does not use passive listeners to improve scrolling performance
Improve the page's scroll performance by marking touch and wheel event listeners as 'passive'.
Source
SHOW DETAILS
Avoid `document.write()`
Avoid or limit the use of external scripts that are dynamically injected via 'document.write()' as users on slow connections will be delayed by tens of seconds.
Source
SHOW DETAILS
First Contentful Paint (3G) — 4892.276947021484 ms
The time taken for the first image or text on the page to be rendered while on a 3G network.
90

Accessibility

Indicates how accessible the page is and highlights opportunities where the page can be made more accessible to users of sparkchess.com. This includes details about various page attributes that can be optimized.

Navigation

`[accesskey]` values are unique
Access keys assist users with focusing on different parts of the page. Each access key should be unique for proper navigation.
The page contains a heading, skip link, or landmark region
It is advised to provide ways to bypass repetitive content, allowing users to navigate the page efficiently.
`[id]` attributes on active, focusable elements are unique
Ensure all focusable elements have a unique id value to allow them to be visible to users of assistive technologies, like a screen reader.
Heading elements appear in a sequentially-descending order
Properly order all headers and do not skip heading levels to better the navigation and readability for users of assistive technologies, like a screen reader.
No element has a `[tabindex]` value greater than 0
Although technically valid, a tabindex value greater than 0 often creates frustrating experiences for users who rely on assistive technologies.

ARIA

`button`, `link`, and `menuitem` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[aria-hidden="true"]` is not present on the document `<body>`
If aria-hidden=true is set on the document body, assistive technologies, like a screen reader will work inconsistently.
`[aria-hidden="true"]` elements do not contain focusable descendents
Interactive elements within an aria-hidden=true element are unavailable to users of assistive technologies, like a screen reader.
ARIA input fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when an input field does not have an accessible name specified.
ARIA `meter` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
ARIA `progressbar` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[role]`s have all required `[aria-*]` attributes
Some ARIA roles have required 'aria-*' attributes, which provide essential information about state and functionality.
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
Some ARIA parent roles cannot perform their intended functions if specific child roles are not used.
`[role]`s are contained by their required parent element
Some ARIA child roles cannot perform their intended functions if specific parent roles are not used.
`[role]` values are valid
All ARIA roles require valid values to perform their intended functions.
ARIA toggle fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when a toggle field does not have an accessible name specified.
ARIA `tooltip` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
ARIA `treeitem` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[aria-*]` attributes have valid values
ARIA attributes cannot be interpreted with invalid values when used by screen readers and other assistive technologies.
`[aria-*]` attributes are valid and not misspelled
ARIA attributes cannot be interpreted with invalid names when used by screen readers and other assistive technologies.
ARIA IDs are unique
Ensure all ARIA ID values are unique to prevent elements from being overlooked by assistive technologies, like a screen reader.

Names and labels

Buttons have an accessible name
Buttons become unusable as they are announced simply as "button" when the button does not have an accessible name, when used by screen readers and other assistive technologies.
Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
No form fields have multiple labels
Having multiple labels for form fields can be confusing to assistive technologies, like a screen reader.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
`<input type="image">` elements have `[alt]` text
Input buttons with alternative text assist screen readers and other assistive technology users to understand its purpose.
Form elements have associated labels
Screen readers and other assistive technologies rely on labels to properly announce form controls.
Links have a discernible name
In order to improve the navigation for screen reader and other assistive technology users, use link text that is unique, focusable and discernible.
`<object>` elements have alternate text
It is advised that alt text is used on '<object>' elements in order to provide meaning to screen reader and other assistive technology users, as these technologies are unable to translate non-text content.

Contrast

Background and foreground colors have a sufficient contrast ratio
Many (if not most) users find low-contrast text difficult or impossible to read.

Tables and lists

`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
Screen readers and other assistive technologies may produce poor and inaccurate output when definition lists are not properly marked up.
Definition list items are wrapped in `<dl>` elements
In order for screen readers and other assistive technologies to properly announce definition list items ('<dt>' and '<dd>'), they must be wrapped in parent a '<dl>' element.
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
Use proper list structure to aid screen readers and other assistive technologies.
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
In order for screen readers to announce list items, ensure that list items ('<li>') are contained within parent '<ul>' or '<ol>' tags.
Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that '<td>' cells using the headers attribute only refer to other cells in the same table, to improve screen reader user experience.
`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that table headers refer to some set of cells, to improve screen reader user experience.

Internationalization and localization

`<html>` element has a `[lang]` attribute
It is advised to provide a lang attribute so that screen readers and other assistive technologies are guaranteed to announce the page's text correctly. When not provided, the user's default language setting will be used which may cause inaccuracies.
`<html>` element has a valid value for its `[lang]` attribute
Specify a valid BCP 47 language in order to help screen readers and other assistive technologies announce text properly.
`[lang]` attributes have a valid value
Specify a valid BCP 47 language on elements in order to help screen readers and other assistive technologies announce text properly.

Best practices

The document does not use `<meta http-equiv="refresh">`
Pages that refresh automatically cause a poor user experience as focus is directed back to the top of the page unexpectedly.
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
For users with low vision who rely on screen magnification, ensure that zooming is not disabled.

Audio and video

`<video>` elements contain a `<track>` element with `[kind="captions"]`
Sparkchess.com may provide assistance to deaf or hearing-impaired users with captions on videos.

ARIA

`[aria-*]` attributes do not match their roles
Avoid mismatching 'aria-*' attributes and their 'role' value, as it invalidates the attribute.
Failing Elements
Advertisement
Advertisement

Names and labels

`<frame>` or `<iframe>` elements do not have a title
Screen reader users and other assistive technology users rely on frame titles to describe the contents of frames.
Failing Elements
div#bnr1 > ins.adsbygoogle > div#aswift_0_host > iframe#aswift_0
body > ins.adsbygoogle > div#aswift_2_host > iframe#aswift_2

Manual Checks

The page has a logical tab order
The visual layout should be logical in its tab order and users cannot focus elements that are offscreen.
Interactive controls are keyboard focusable
Ensure that custom interactive controls are keyboard focusable and that a focus indicator is displayed.
Interactive elements indicate their purpose and state
Ensure that interactive elements (such as links and buttons) are distinguishable from non-interactive elements and that they indicate their state.
The user's focus is directed to new content added to the page
When new content (such as a dialogue) is added to the page, the user's focus should be directed to it.
User focus is not accidentally trapped in a region
Avoid focus being accidentally trapped when a user tabs in and out of controls or regions on page.
Custom controls have associated labels
Ensure that custom interactive controls have associated labels, which are provided by aria-label and aria-labelledby attributes.
Custom controls have ARIA roles
Ensure that all custom interactive controls have appropriate ARIA roles.
Visual order on the page follows DOM order
Ensure that the DOM order matches with the page's visual order, in order to improve navigation for screen readers and other assistive technologies.
Offscreen content is hidden from assistive technology
Ensure that offscreen content is hidden through the use of "display:none" styling or the aria-hidden attribute.
HTML5 landmark elements are used to improve navigation
Elements such as <main> and <nav> are recommended as they are used by screen readers and other assistive technologies to improve keyboard navigation.
92

Best Practices

Indicates the recommended, best practices currently in place on the page and highlights the best practices that sparkchess.com should incorporate. This includes practices such as protecting pages with HTTPS.

Audits

Avoids requesting the geolocation permission on page load
When requesting a user's location, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Avoids requesting the notification permission on page load
When requesting permission to send notifications, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Avoids front-end JavaScript libraries with known security vulnerabilities
Ensure that the use of third-party scripts is minimal and that only trusted third-party scripts are used as some may contain known security vulnerabilities which may be exploited by attackers.
Ensure CSP is effective against XSS attacks
Significantly reduce the risk of cross-site scripting attacks (XSS) by ensuring you have a strong Content Security Policy (CSP).
Description Directive Severity
No CSP found in enforcement mode
High

Audits

Allows users to paste into password fields
Ensure that password inputs may be pasted into to aid in the user's ability to use password managers and improve security.
Displays images with correct aspect ratio
Ensure that image display dimensions match their natural aspect ratio.
Serves images with appropriate resolution
For maximum image clarity, ensure images have natural dimensions and are proportional to the display size and pixel ratio.
Fonts with `font-display: optional` are preloaded
It is recommended that optional fonts are preloaded.

Audits

Page has the HTML doctype
Ensure a doctype is specified to prevent the browser from switching to quirks-mode.
Properly defines charset
It is advised to declare a character encoding, optionally via a <meta> tag in the first 1024 bytes of the HTML or in the Content-Type HTTP response header.

Audits

Detected JavaScript libraries
Below is a list of all front-end JavaScript libraries that were detected on the page.
Name Version
Workbox
3.6.1
Avoids deprecated APIs
Avoid deprecated APIs which will eventually be removed the browser.
No browser errors logged to the console
Below is a list of all errors logged to the console, which indicate unresolved problems on the site.
Page has valid source maps
Consider deploying source maps for added benefits such as the ability to debug while in production.
URL Map URL
https://pagead2.googlesyndication.com/bg/ZEudAwKmaTNpvGbgtwbUkI0ybKz2KwCtXmqAoF5myvk.js
No issues in the `Issues` panel in Chrome Devtools
There may be unresolved issues logged to Chrome Devtools.

Audits

Does not use HTTPS — 1 insecure request found
Ensure that all pages are protected with HTTPS (including those that do not handle sensitive data) as HTTPS prevents tampering and passive listening on communications between the app and its users. Additionally, HTTPS is a prerequisite for HTTP/2 and many new web platform APIs.
Insecure URL Request Resolution
http://sparkchess.com/
Allowed
98

SEO

Indicates how well the page is optimized for ranking in search engines and highlights Search Engine Optimization (SEO) opportunities for sparkchess.com. This includes optimizations such as providing meta data.

Mobile Friendly

Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of sparkchess.com on mobile screens.
Document uses legible font sizes — 100% legible text
Font sizes of 12px or less are too small to most mobile users without user gestures and further action. Aim for more than 60% of page text to use font sizes greater than 12px.
Source Selector % of Page Text Font Size
SHOW DETAILS
#logo sup
0.00%
11px
SHOW DETAILS
100.00%
≥ 12px

Content Best Practices

Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
Document has a meta description
Meta descriptions may be used by search engines when displaying a link to the page and should concisely summarize the page's content.
Links have descriptive text
Make use of descriptive link text to assist search engines in understanding the content.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
Document has a valid `hreflang`
Search engines can be instructed to list specific versions of a page for a given language or region through the use of hreflang links.
Document has a valid `rel=canonical`
Search engines can be suggested which URL should be shown in search results through the use of canonical links.
Document avoids plugins
The content of plugins cannot be indexed by search engines and many devices either restrict or do not support them.

Crawling and Indexing

Page has successful HTTP status code
Avoid pages with unsuccessful HTTP status codes as they may not be indexed by search engines.
Links are crawlable
Ensure that the 'href' attribute of anchor elements links to the appropriate destination. This allows for more pages of the site to be discovered by search engines.
Page isn’t blocked from indexing
Pages that cannot be crawled by search engines cannot be indexed or included in their search results. Ensure that search engines have permission to crawl all pages that should be indexed.
robots.txt is valid
Malformed robots.txt files prevent crawlers from understanding how a site wants to be crawled or indexed, which can be devastating to SEO.

Mobile Friendly

Tap targets are not sized appropriately — 88% appropriately sized tap targets
Interactive elements (such as buttons and links) should be appropriately spaced, sized and easy enough to select or tap with regard to their surrounding elements.
Tap Target Size Overlapping Target
Privacy Policy
79x15
Terms of Service
body > div#wrapper > div#socialContainer > a
26x34
body > div#wrapper > div#socialContainer > a

Manual Checks

Structured data is valid
Structured data can be validated through the use of the Structured Data Testing Tool and the Structured Data Linter.
90

PWA

Indicates how valid the aspects of a Progressive Web App (PWA) are for the page and highlights opportunities to enable/improve the PWA of sparkchess.com. This includes details about web app manifests.

Installable

Web app manifest and service worker meet the installability requirements
User engagement may be increased by leveraging the browsers ability to proactively prompt users to add the app to their homescreen.

PWA Optimized

Registers a service worker that controls page and `start_url`
A service worker is used to provide Progressive Web Apps the use of features such as working offline, the ability for the app to be added to the homescreen as well as push notifications.
Configured for a custom splash screen
Themed splash screens ensure a high-quality user experience at launch for app users.
View Data
Sets a theme color for the address bar.
A theme may be applied to the browser address bar, which ideally can be made to match the site.
View Data
Content is sized correctly for the viewport
Ensure that the width of the app's content matches the width of the viewport, otherwise the app might not be optimized for mobile screens.
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of sparkchess.com on mobile screens.
Provides a valid `apple-touch-icon`
iOS users of Progressive Web Apps will benefit from an apple touch icon, which can be defined with 'apple-touch-icon', which must point to a non-transparent 192px (or 180px) square PNG.

PWA Optimized

Manifest doesn't have a maskable icon
Maskable icons are great to ensure that images fill the entire shape when installing the app on a device.

Manual Checks

Site works cross-browser
Ensure that the Progressive Web App works correctly across every major browser.
Page transitions don't feel like they block on the network
Users perceive apps with responsive, snappy transitions as higher peforming and ensures a great user experience, even on a slow network.
Each page has a URL
Ensure that all pages are deep linkable via URL. They should also be unique for the purpose of shareability on social media.
Hosting

Server Location

Server IP Address: 104.26.14.225
Continent: North America
Country: United States
United States Flag
Region:
City:
Longitude: -97.822
Latitude: 37.751
Currencies: USD
USN
USS
Languages: English

Web Hosting Provider

Name IP Address
Cloudflare, Inc.
Registration

Domain Registrant

Private Registration: No
Name:
Organization: Cloudflare, Inc.
Country: CA
City: wafangdian
State: ON
Post Code:
Email:
Phone:
Note: Registration information is derived from various sources and may be inaccurate.

Domain Registrar

Name IP Address
NAMECHEAP INC 104.16.99.56
Security

Visitor Safety

Mature Content: Not Likely
McAfee WebAdvisor Rating: Safe
WOT Rating:
WOT Trustworthiness: 92/100
WOT Child Safety: 92/100
Note: Safety information is not guaranteed.

SSL/TLS Certificate

Issued To: sni.cloudflaressl.com
Issued By: Cloudflare Inc ECC CA-3
Valid From: 6th June, 2022
Valid To: 5th June, 2023
Subject: CN = sni.cloudflaressl.com
O = Cloudflare, Inc.
L = San Francisco
S = US
Hash: c959965e
Issuer: CN = Cloudflare Inc ECC CA-3
O = Cloudflare, Inc.
S = US
Version: 2
Serial Number: 17113401073219470738056539674344767504
Serial Number (Hex): 0CDFEBD0FE1352B171C1E5C730114010
Valid From: 6th June, 2024
Valid To: 5th June, 2024
Signature Algorithm (Short Name): ecdsa-with-SHA256
Signature Algorithm (Long Name): ecdsa-with-SHA256
Authority Key Identifier: keyid:A5:CE:37:EA:EB:B0:75:0E:94:67:88:B4:45:FA:D9:24:10:87:96:1F
Extended Key Usage: TLS Web Server Authentication, TLS Web Client Authentication
CRL Distribution Points:
Full Name:
URI:http://crl3.digicert.com/CloudflareIncECCCA-3.crl

Full Name:
URI:http://crl4.digicert.com/CloudflareIncECCCA-3.crl
Certificate Policies: Policy: 2.23.140.1.2.2
CPS: http://www.digicert.com/CPS
Authority Information Access: OCSP - URI:http://ocsp.digicert.com
CA Issuers - URI:http://cacerts.digicert.com/CloudflareIncECCCA-3.crt
SCT List: Signed Certificate Timestamp:
Version : v1 (0x0)
Log ID : E8:3E:D0:DA:3E:F5:06:35:32:E7:57:28:BC:89:6B:C9:
03:D3:CB:D1:11:6B:EC:EB:69:E1:77:7D:6D:06:BD:6E
Timestamp : Jun 6 20:24:47.691 2022 GMT
Extensions: none
Signature : ecdsa-with-SHA256
30:44:02:20:44:AC:6F:A2:9C:99:AE:9C:94:75:18:D0:
FB:0E:14:EC:67:C1:BB:79:58:0E:9B:6B:B9:C2:CB:B8:
CA:95:E5:25:02:20:7D:6D:D7:41:54:F5:24:47:50:6A:
07:77:4E:F7:0C:8F:84:4F:83:20:83:4F:05:0E:1B:04:
F7:7C:E2:C9:35:E7
Signed Certificate Timestamp:
Version : v1 (0x0)
Log ID : 35:CF:19:1B:BF:B1:6C:57:BF:0F:AD:4C:6D:42:CB:BB:
B6:27:20:26:51:EA:3F:E1:2A:EF:A8:03:C3:3B:D6:4C
Timestamp : Jun 6 20:24:47.697 2022 GMT
Extensions: none
Signature : ecdsa-with-SHA256
30:46:02:21:00:CD:03:59:75:BF:DE:96:F5:1F:C8:80:
77:09:89:DE:7D:61:F2:32:AC:22:FE:28:46:31:EE:77:
A5:C9:5A:D8:DA:02:21:00:D7:C8:69:AB:69:3D:7F:54:
B7:61:DE:97:2E:83:92:5A:E8:A5:BB:FA:14:C1:73:56:
63:80:4A:1E:E9:11:2B:F3
Signed Certificate Timestamp:
Version : v1 (0x0)
Log ID : B3:73:77:07:E1:84:50:F8:63:86:D6:05:A9:DC:11:09:
4A:79:2D:B1:67:0C:0B:87:DC:F0:03:0E:79:36:A5:9A
Timestamp : Jun 6 20:24:47.766 2022 GMT
Extensions: none
Signature : ecdsa-with-SHA256
30:45:02:21:00:80:00:17:64:ED:E5:CA:32:07:D0:AC:
94:40:B6:97:C7:C2:71:46:AC:2D:EB:23:8F:9C:46:2F:
54:26:A3:C0:FC:02:20:3A:F3:F3:8E:C7:E1:31:97:D0:
1E:96:65:9E:AE:45:B7:6A:CC:54:FB:EB:EE:B3:C1:18:
91:3C:67:48:8C:FE:28
Key Usage: Digital Signature
Basic Constraints: CA:FALSE
Subject Alternative Name: DNS:*.sparkchess.com
DNS:sparkchess.com
DNS:sni.cloudflaressl.com
Technical

DNS Lookup

HTTP Response Headers

HTTP-Code: HTTP/1.1 301 Moved Permanently
Date: 17th October, 2022
Content-Type: text/html
Server: cloudflare
Connection: keep-alive
location: https://www.sparkchess.com/
x-addr: CF:1 FWD:67.205.137.127 RAD:162.158.62.233 RIP:162.158.62.233
CF-Cache-Status: DYNAMIC
Report-To: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=vlGATOwFjPulP8gQ%2Fq1GV1y3ftxnTxVTb3LNEdsgrLnJmaDZ1fVYBTgn71YRUE2SaY2g6aQdirIgLpoH811fGxPpjq9IXsVUl6UHdPRm%2Bj9Yxy3iEjQG813R282u5Uyr"}],"group":"cf-nel","max_age":604800}
NEL: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
CF-RAY: 75bb47b5ca381778-EWR
alt-svc: h3=":443"; ma=86400, h3-29=":443"; ma=86400

Whois Lookup

Created: 5th August, 2008
Changed: 7th June, 2018
Expires: 5th August, 2024
Registrar: NAMECHEAP INC
Status: clientTransferProhibited
Nameservers: elinore.ns.cloudflare.com
kanye.ns.cloudflare.com
Owner Name: Redacted for Privacy
Owner Organization: Privacy service provided by Withheld for Privacy ehf
Owner Street: Kalkofnsvegur 2
Owner Post Code: 101
Owner City: Reykjavik
Owner State: Capital Region
Owner Country: IS
Owner Phone: +354.4212434
Owner Email: a389a00e74e549de8d48bbab8ad633f0.protect@withheldforprivacy.com
Admin Name: Redacted for Privacy
Admin Organization: Privacy service provided by Withheld for Privacy ehf
Admin Street: Kalkofnsvegur 2
Admin Post Code: 101
Admin City: Reykjavik
Admin State: Capital Region
Admin Country: IS
Admin Phone: +354.4212434
Admin Email: a389a00e74e549de8d48bbab8ad633f0.protect@withheldforprivacy.com
Tech Name: Redacted for Privacy
Tech Organization: Privacy service provided by Withheld for Privacy ehf
Tech Street: Kalkofnsvegur 2
Tech Post Code: 101
Tech City: Reykjavik
Tech State: Capital Region
Tech Country: IS
Tech Phone: +354.4212434
Tech Email: a389a00e74e549de8d48bbab8ad633f0.protect@withheldforprivacy.com
Full Whois: Domain name: sparkchess.com
Registry Domain ID: 1512201979_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.namecheap.com
Registrar URL: http://www.namecheap.com
Updated Date: 2018-06-07T08:34:29.00Z
Creation Date: 2008-08-05T09:07:33.00Z
Registrar Registration Expiration Date: 2024-08-05T09:07:33.00Z
Registrar: NAMECHEAP INC
Registrar IANA ID: 1068
Registrar Abuse Contact Email: abuse@namecheap.com
Registrar Abuse Contact Phone: +1.9854014545
Reseller: NAMECHEAP INC
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Registry Registrant ID:
Registrant Name: Redacted for Privacy
Registrant Organization: Privacy service provided by Withheld for Privacy ehf
Registrant Street: Kalkofnsvegur 2
Registrant City: Reykjavik
Registrant State/Province: Capital Region
Registrant Postal Code: 101
Registrant Country: IS
Registrant Phone: +354.4212434
Registrant Phone Ext:
Registrant Fax:
Registrant Fax Ext:
Registrant Email: a389a00e74e549de8d48bbab8ad633f0.protect@withheldforprivacy.com
Registry Admin ID:
Admin Name: Redacted for Privacy
Admin Organization: Privacy service provided by Withheld for Privacy ehf
Admin Street: Kalkofnsvegur 2
Admin City: Reykjavik
Admin State/Province: Capital Region
Admin Postal Code: 101
Admin Country: IS
Admin Phone: +354.4212434
Admin Phone Ext:
Admin Fax:
Admin Fax Ext:
Admin Email: a389a00e74e549de8d48bbab8ad633f0.protect@withheldforprivacy.com
Registry Tech ID:
Tech Name: Redacted for Privacy
Tech Organization: Privacy service provided by Withheld for Privacy ehf
Tech Street: Kalkofnsvegur 2
Tech City: Reykjavik
Tech State/Province: Capital Region
Tech Postal Code: 101
Tech Country: IS
Tech Phone: +354.4212434
Tech Phone Ext:
Tech Fax:
Tech Fax Ext:
Tech Email: a389a00e74e549de8d48bbab8ad633f0.protect@withheldforprivacy.com
Name Server: elinore.ns.cloudflare.com
Name Server: kanye.ns.cloudflare.com
DNSSEC: unsigned
URL of the ICANN WHOIS Data Problem Reporting System: http://wdprs.internic.net/
>>> Last update of WHOIS database: 2022-10-17T17:01:02.80Z <<<
For more information on Whois status codes, please visit https://icann.org/epp
View Raw Whois

Nameservers

Name IP Address
elinore.ns.cloudflare.com 172.64.32.153
kanye.ns.cloudflare.com 172.64.33.189
Related

Subdomains

Domain Subdomain
chrome.sparkchess.com
chrome

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