Lighthouse Desktop

· 0 checks — Desktop Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Detailed Report

Audit breakdown by category with detailed findings.

100

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Performance issues directly impact user engagement and conversion rates.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.

title: Preconnected origins

value: no origins were preconnected

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

value: No additional origins are good candidates for preconnecting

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size
news.ycombinator.com/news.css?XSk0rJr6l6WsiwmV3Oaq	2.0 KiB

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

●Use efficient cache lifetimes

●Layout shift culprits

●Document request latency

●Optimize DOM size

●Font display

●Forced reflow

●Improve image delivery

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Time to Interactive 0.3 s

●Max Potential First Input Delay 30 ms

●Minify CSS

●Minify JavaScript

●Reduce unused CSS

●Reduce unused JavaScript

●Avoids enormous network payloads Total size was 11 KiB

●JavaScript execution time 0.0 s

●Minimizes main-thread work 0.1 s

●Image elements have explicit `width` and `height`

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 150 ms

●Server Backend Latencies 0 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid multiple page redirects

●Initial server response time was short Root document took 150 ms

○INP breakdown

○LCP request discovery

○User Timing marks and measures

○Avoid long main-thread tasks

○Avoid non-composited animations

○Avoid large layout shifts

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
1. `tbody > tr#48071262 > td.title > span.rank`
gowers.wordpress.com `span.titleline > span.sitebit > a > span.sitestr`
188 points by _alternator_ 3 hours ago \| hide \| 83 comments `tbody > tr > td.subtext > span.subline`
188 points `tr > td.subtext > span.subline > span#score_48071262`
_alternator_ `tr > td.subtext > span.subline > a.hnuser`
3 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
83 comments `tr > td.subtext > span.subline > a`
2. `tbody > tr#48067119 > td.title > span.rank`
reclaimthenet.org `span.titleline > span.sitebit > a > span.sitestr`
908 points by anonymousiam 12 hours ago \| hide \| 297 comments `tbody > tr > td.subtext > span.subline`
908 points `tr > td.subtext > span.subline > span#score_48067119`
anonymousiam `tr > td.subtext > span.subline > a.hnuser`
12 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
297 comments `tr > td.subtext > span.subline > a`
3. `tbody > tr#48071940 > td.title > span.rank`
twitter.com/trq212 `span.titleline > span.sitebit > a > span.sitestr`
83 points by pretext 2 hours ago \| hide \| 41 comments `tbody > tr > td.subtext > span.subline`
83 points `tr > td.subtext > span.subline > span#score_48071940`
pretext `tr > td.subtext > span.subline > a.hnuser`
2 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
41 comments `tr > td.subtext > span.subline > a`
4. `tbody > tr#48051951 > td.title > span.rank`
moq.dev `span.titleline > span.sitebit > a > span.sitestr`
259 points by atgctg 8 hours ago \| hide \| 65 comments `tbody > tr > td.subtext > span.subline`
259 points `tr > td.subtext > span.subline > span#score_48051951`
atgctg `tr > td.subtext > span.subline > a.hnuser`
8 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
65 comments `tr > td.subtext > span.subline > a`
5. `tbody > tr#48046436 > td.title > span.rank`
martinfowler.com `span.titleline > span.sitebit > a > span.sitestr`
118 points by ingve 6 hours ago \| hide \| 90 comments `tbody > tr > td.subtext > span.subline`
118 points `tr > td.subtext > span.subline > span#score_48046436`
ingve `tr > td.subtext > span.subline > a.hnuser`
6 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
90 comments `tr > td.subtext > span.subline > a`
6. `tbody > tr#48037517 > td.title > span.rank`
quantamagazine.org `span.titleline > span.sitebit > a > span.sitestr`
22 points by Tomte 2 hours ago \| hide \| discuss `tbody > tr > td.subtext > span.subline`
22 points `tr > td.subtext > span.subline > span#score_48037517`
Tomte `tr > td.subtext > span.subline > a.hnuser`
2 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
discuss `tr > td.subtext > span.subline > a`
7. `tbody > tr#48066524 > td.title > span.rank`
jefftk.com `span.titleline > span.sitebit > a > span.sitestr`
313 points by speckx 13 hours ago \| hide \| 130 comments `tbody > tr > td.subtext > span.subline`
313 points `tr > td.subtext > span.subline > span#score_48066524`
speckx `tr > td.subtext > span.subline > a.hnuser`
13 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
130 comments `tr > td.subtext > span.subline > a`
8. `tbody > tr#48061884 > td.title > span.rank`
bbc.com `span.titleline > span.sitebit > a > span.sitestr`
582 points by defrost 19 hours ago \| hide \| 115 comments `tbody > tr > td.subtext > span.subline`
582 points `tr > td.subtext > span.subline > span#score_48061884`
defrost `tr > td.subtext > span.subline > a.hnuser`
19 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
115 comments `tr > td.subtext > span.subline > a`
9. `tbody > tr#48072190 > td.title > span.rank`
cyberinsider.com `span.titleline > span.sitebit > a > span.sitestr`
77 points by muse900 1 hour ago \| hide \| 36 comments `tbody > tr > td.subtext > span.subline`
77 points `tr > td.subtext > span.subline > span#score_48072190`
muse900 `tr > td.subtext > span.subline > a.hnuser`
1 hour ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
36 comments `tr > td.subtext > span.subline > a`
10. `tbody > tr#48065511 > td.title > span.rank`
lachlan.nz `span.titleline > span.sitebit > a > span.sitestr`
122 points by mufeedvh 8 hours ago \| hide \| 6 comments `tbody > tr > td.subtext > span.subline`
122 points `tr > td.subtext > span.subline > span#score_48065511`
mufeedvh `tr > td.subtext > span.subline > a.hnuser`
8 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
6 comments `tr > td.subtext > span.subline > a`
11. `tbody > tr#48037760 > td.title > span.rank`
wiisfi.com `span.titleline > span.sitebit > a > span.sitestr`
194 points by homebrewer 10 hours ago \| hide \| 51 comments `tbody > tr > td.subtext > span.subline`
194 points `tr > td.subtext > span.subline > span#score_48037760`
homebrewer `tr > td.subtext > span.subline > a.hnuser`
10 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
51 comments `tr > td.subtext > span.subline > a`
12. `tbody > tr#48058197 > td.title > span.rank`
cnbc.com `span.titleline > span.sitebit > a > span.sitestr`
201 points by christhecaribou 12 hours ago \| hide \| 136 comments `tbody > tr > td.subtext > span.subline`
201 points `tr > td.subtext > span.subline > span#score_48058197`
christhecaribou `tr > td.subtext > span.subline > a.hnuser`
12 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
136 comments `tr > td.subtext > span.subline > a`
13. `tbody > tr#48065360 > td.title > span.rank`
webdesignmuseum.org `span.titleline > span.sitebit > a > span.sitestr`
327 points by willmeyers 15 hours ago \| hide \| 104 comments `tbody > tr > td.subtext > span.subline`
327 points `tr > td.subtext > span.subline > span#score_48065360`
willmeyers `tr > td.subtext > span.subline > a.hnuser`
15 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
104 comments `tr > td.subtext > span.subline > a`
14. `tbody > tr#48067734 > td.title > span.rank`
ze3tar.github.io `span.titleline > span.sitebit > a > span.sitestr`
175 points by MrBruh 11 hours ago \| hide \| 98 comments `tbody > tr > td.subtext > span.subline`
175 points `tr > td.subtext > span.subline > span#score_48067734`
MrBruh `tr > td.subtext > span.subline > a.hnuser`
11 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
98 comments `tr > td.subtext > span.subline > a`
15. `tbody > tr#48061566 > td.title > span.rank`
meshtastic.org `span.titleline > span.sitebit > a > span.sitestr`
424 points by ColinWright 20 hours ago \| hide \| 155 comments `tbody > tr > td.subtext > span.subline`
424 points `tr > td.subtext > span.subline > span#score_48061566`
ColinWright `tr > td.subtext > span.subline > a.hnuser`
20 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
155 comments `tr > td.subtext > span.subline > a`
16. `tbody > tr#48040306 > td.title > span.rank`
mceglowski.substack.com `span.titleline > span.sitebit > a > span.sitestr`
84 points by zdw 6 hours ago \| hide \| 22 comments `tbody > tr > td.subtext > span.subline`
84 points `tr > td.subtext > span.subline > span#score_48040306`
zdw `tr > td.subtext > span.subline > a.hnuser`
6 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
22 comments `tr > td.subtext > span.subline > a`
17. `tbody > tr#48065254 > td.title > span.rank`
sigops.org `span.titleline > span.sitebit > a > span.sitestr`
74 points by mad 8 hours ago \| hide \| 15 comments `tbody > tr > td.subtext > span.subline`
74 points `tr > td.subtext > span.subline > span#score_48065254`
mad `tr > td.subtext > span.subline > a.hnuser`
8 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
15 comments `tr > td.subtext > span.subline > a`
18. `tbody > tr#48040470 > td.title > span.rank`
colorado.edu `span.titleline > span.sitebit > a > span.sitestr`
64 points by geox 8 hours ago \| hide \| 17 comments `tbody > tr > td.subtext > span.subline`
64 points `tr > td.subtext > span.subline > span#score_48040470`
geox `tr > td.subtext > span.subline > a.hnuser`
8 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
17 comments `tr > td.subtext > span.subline > a`
19. `tbody > tr#48066592 > td.title > span.rank`
anthropic.com `span.titleline > span.sitebit > a > span.sitestr`
149 points by pretext 13 hours ago \| hide \| 75 comments `tbody > tr > td.subtext > span.subline`
149 points `tr > td.subtext > span.subline > span#score_48066592`
pretext `tr > td.subtext > span.subline > a.hnuser`
13 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
75 comments `tr > td.subtext > span.subline > a`
20. `tbody > tr#48038322 > td.title > span.rank`
portalvr.io `span.titleline > span.sitebit > a > span.sitestr`
13 points by gfodor 2 hours ago \| hide \| 1 comment `tbody > tr > td.subtext > span.subline`
13 points `tr > td.subtext > span.subline > span#score_48038322`
gfodor `tr > td.subtext > span.subline > a.hnuser`
2 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
1 comment `tr > td.subtext > span.subline > a`
21. `tbody > tr#48032014 > td.title > span.rank`
worksinprogress.co `span.titleline > span.sitebit > a > span.sitestr`
42 points by akkartik 5 hours ago \| hide \| 5 comments `tbody > tr > td.subtext > span.subline`
42 points `tr > td.subtext > span.subline > span#score_48032014`
akkartik `tr > td.subtext > span.subline > a.hnuser`
5 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
5 comments `tr > td.subtext > span.subline > a`
22. `tbody > tr#48064312 > td.title > span.rank`
btxx.org `span.titleline > span.sitebit > a > span.sitestr`
214 points by xngbuilds 16 hours ago \| hide \| 89 comments `tbody > tr > td.subtext > span.subline`
214 points `tr > td.subtext > span.subline > span#score_48064312`
xngbuilds `tr > td.subtext > span.subline > a.hnuser`
16 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
89 comments `tr > td.subtext > span.subline > a`
23. `tbody > tr#48057901 > td.title > span.rank`
mojolang.org `span.titleline > span.sitebit > a > span.sitestr`
333 points by sbt567 1 day ago \| hide \| 214 comments `tbody > tr > td.subtext > span.subline`
333 points `tr > td.subtext > span.subline > span#score_48057901`
sbt567 `tr > td.subtext > span.subline > a.hnuser`
1 day ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
214 comments `tr > td.subtext > span.subline > a`
24. `tbody > tr#48037655 > td.title > span.rank`
yosefk.com `span.titleline > span.sitebit > a > span.sitestr`
50 points by akkartik 10 hours ago \| hide \| 43 comments `tbody > tr > td.subtext > span.subline`
50 points `tr > td.subtext > span.subline > span#score_48037655`
akkartik `tr > td.subtext > span.subline > a.hnuser`
10 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
43 comments `tr > td.subtext > span.subline > a`
25. `tbody > tr#48071496 > td.title > span.rank`
techrights.org `span.titleline > span.sitebit > a > span.sitestr`
113 points by esaym 4 hours ago \| hide \| 49 comments `tbody > tr > td.subtext > span.subline`
113 points `tr > td.subtext > span.subline > span#score_48071496`
esaym `tr > td.subtext > span.subline > a.hnuser`
4 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
49 comments `tr > td.subtext > span.subline > a`
26. `tbody > tr#48068732 > td.title > span.rank`
mux.com `span.titleline > span.sitebit > a > span.sitestr`
10 hours ago `tr > td.subtext > span.age > a`
hide `tbody > tr > td.subtext > a`
27. `tbody > tr#48068254 > td.title > span.rank`
0xkrt26.github.io `span.titleline > span.sitebit > a > span.sitestr`
41 points by denismenace 8 hours ago \| hide \| 7 comments `tbody > tr > td.subtext > span.subline`
41 points `tr > td.subtext > span.subline > span#score_48068254`
denismenace `tr > td.subtext > span.subline > a.hnuser`
8 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
7 comments `tr > td.subtext > span.subline > a`
28. `tbody > tr#48061938 > td.title > span.rank`
war.gov `span.titleline > span.sitebit > a > span.sitestr`
281 points by david-gpu 19 hours ago \| hide \| 420 comments `tbody > tr > td.subtext > span.subline`
281 points `tr > td.subtext > span.subline > span#score_48061938`
david-gpu `tr > td.subtext > span.subline > a.hnuser`
19 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
420 comments `tr > td.subtext > span.subline > a`
29. `tbody > tr#48069192 > td.title > span.rank`
pcmag.com `span.titleline > span.sitebit > a > span.sitestr`
241 points by tcp_handshaker 9 hours ago \| hide \| 157 comments `tbody > tr > td.subtext > span.subline`
241 points `tr > td.subtext > span.subline > span#score_48069192`
tcp_handshaker `tr > td.subtext > span.subline > a.hnuser`
9 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
157 comments `tr > td.subtext > span.subline > a`
30. `tbody > tr#48049014 > td.title > span.rank`
asteriskmag.com `span.titleline > span.sitebit > a > span.sitestr`
95 points by kqr 11 hours ago \| hide \| 36 comments `tbody > tr > td.subtext > span.subline`
95 points `tr > td.subtext > span.subline > span#score_48049014`
kqr `tr > td.subtext > span.subline > a.hnuser`
11 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
36 comments `tr > td.subtext > span.subline > a`
Guidelines \| FAQ \| Lists \| API \| Security \| Legal \| Apply to YC \| Contact `tr > td > center > span.yclinks`
Search: `tr > td > center > form`

These are opportunities to improve the legibility of your content.

Names and labels

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
tr > td > a > img `tr > td > a > img`
tbody > tr#48068732 > td > img `tbody > tr#48068732 > td > img`
tbody > tr > td > img `tbody > tr > td > img`

Labels ensure that form controls are announced properly by assistive technologies, like screen readers. Learn more about form element labels.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
td > center > form > input `td > center > form > input`

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
tbody > tr > td > a `tbody > tr > td > a`

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
tr#48071262 > td.votelinks > center > a#up_48071262 `tr#48071262 > td.votelinks > center > a#up_48071262`
tr#48067119 > td.votelinks > center > a#up_48067119 `tr#48067119 > td.votelinks > center > a#up_48067119`
tr#48071940 > td.votelinks > center > a#up_48071940 `tr#48071940 > td.votelinks > center > a#up_48071940`
tr#48051951 > td.votelinks > center > a#up_48051951 `tr#48051951 > td.votelinks > center > a#up_48051951`
tr#48046436 > td.votelinks > center > a#up_48046436 `tr#48046436 > td.votelinks > center > a#up_48046436`
tr#48037517 > td.votelinks > center > a#up_48037517 `tr#48037517 > td.votelinks > center > a#up_48037517`
tr#48066524 > td.votelinks > center > a#up_48066524 `tr#48066524 > td.votelinks > center > a#up_48066524`
tr#48061884 > td.votelinks > center > a#up_48061884 `tr#48061884 > td.votelinks > center > a#up_48061884`
tr#48072190 > td.votelinks > center > a#up_48072190 `tr#48072190 > td.votelinks > center > a#up_48072190`
tr#48065511 > td.votelinks > center > a#up_48065511 `tr#48065511 > td.votelinks > center > a#up_48065511`
tr#48037760 > td.votelinks > center > a#up_48037760 `tr#48037760 > td.votelinks > center > a#up_48037760`
tr#48058197 > td.votelinks > center > a#up_48058197 `tr#48058197 > td.votelinks > center > a#up_48058197`
tr#48065360 > td.votelinks > center > a#up_48065360 `tr#48065360 > td.votelinks > center > a#up_48065360`
tr#48067734 > td.votelinks > center > a#up_48067734 `tr#48067734 > td.votelinks > center > a#up_48067734`
tr#48061566 > td.votelinks > center > a#up_48061566 `tr#48061566 > td.votelinks > center > a#up_48061566`
tr#48040306 > td.votelinks > center > a#up_48040306 `tr#48040306 > td.votelinks > center > a#up_48040306`
tr#48065254 > td.votelinks > center > a#up_48065254 `tr#48065254 > td.votelinks > center > a#up_48065254`
tr#48040470 > td.votelinks > center > a#up_48040470 `tr#48040470 > td.votelinks > center > a#up_48040470`
tr#48066592 > td.votelinks > center > a#up_48066592 `tr#48066592 > td.votelinks > center > a#up_48066592`
tr#48038322 > td.votelinks > center > a#up_48038322 `tr#48038322 > td.votelinks > center > a#up_48038322`
tr#48032014 > td.votelinks > center > a#up_48032014 `tr#48032014 > td.votelinks > center > a#up_48032014`
tr#48064312 > td.votelinks > center > a#up_48064312 `tr#48064312 > td.votelinks > center > a#up_48064312`
tr#48057901 > td.votelinks > center > a#up_48057901 `tr#48057901 > td.votelinks > center > a#up_48057901`
tr#48037655 > td.votelinks > center > a#up_48037655 `tr#48037655 > td.votelinks > center > a#up_48037655`
tr#48071496 > td.votelinks > center > a#up_48071496 `tr#48071496 > td.votelinks > center > a#up_48071496`
tr#48068254 > td.votelinks > center > a#up_48068254 `tr#48068254 > td.votelinks > center > a#up_48068254`
tr#48061938 > td.votelinks > center > a#up_48061938 `tr#48061938 > td.votelinks > center > a#up_48061938`
tr#48069192 > td.votelinks > center > a#up_48069192 `tr#48069192 > td.votelinks > center > a#up_48069192`
tr#48049014 > td.votelinks > center > a#up_48049014 `tr#48049014 > td.votelinks > center > a#up_48049014`

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html `html`

These items highlight common accessibility best practices.

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

●Document has a `<title>` element

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

●The page contains a heading, skip link, or landmark region

●Identical links have the same purpose.

●Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`[accesskey]` values are unique

○`[aria-*]` attributes match their roles

○`button`, `link`, and `menuitem` elements have accessible names

○ARIA attributes are used as specified for the element's role

○Deprecated ARIA roles were not used

○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

○`[aria-hidden="true"]` elements do not contain focusable descendents

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements use only permitted ARIA attributes

○`[role]`s have all required `[aria-*]` attributes

○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.

○`[role]`s are contained by their required parent element

○`[role]` values are valid

○Elements with the `role=text` attribute do not have focusable descendents.

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

○`[aria-*]` attributes have valid values

○`[aria-*]` attributes are valid and not misspelled

○Buttons have an accessible name

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

○`<frame>` or `<iframe>` elements have a title

○Heading elements appear in a sequentially-descending order

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○Input buttons have discernible text.

○`<input type="image">` elements have `[alt]` text

○Links are distinguishable without relying on color.

○Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

○List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○No element has a `[tabindex]` value greater than 0

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`[lang]` attributes have a valid value

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

○Image elements do not have `[alt]` attributes that are redundant text.

○Elements with visible text labels have matching accessible names.

○`<td>` elements in a large `<table>` have one or more table headers.

Best Practices

Browser Compatibility

Specifying a doctype prevents the browser from switching to quirks-mode. Learn more about the doctype declaration.

Why this matters

Performance issues directly impact user engagement and conversion rates.

●Uses HTTPS

●Avoids deprecated APIs

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Properly defines charset

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate DOM-based XSS with Trusted Types

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Mitigate clickjacking with XFO or CSP

○Detected JavaScript libraries

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Content Best Practices

Meta descriptions may be included in search results to concisely summarize page content. Learn more about the meta description.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Descriptive link text helps search engines understand your content. Learn how to make links more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Link destination	Link Text
news.ycombinator.com/?p=2	More

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
tr > td > a > img `tr > td > a > img`
tbody > tr#48068732 > td > img `tbody > tr#48068732 > td > img`
tbody > tr > td > img `tbody > tr > td > img`

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Page has successful HTTP status code

●Links are crawlable

●robots.txt is valid

●Document has a valid `hreflang`

○Document has a valid `rel=canonical`