Lighthouse Mobile

· 0 checks — Mobile 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?qhau9sYt9MldNVV0J6qe	2.0 KiB

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

●Max Potential First Input Delay 80 ms

●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 0.9 s

●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 0.5 s

●Avoid long main-thread tasks 2 long tasks found

●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 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#47872324 > td.title > span.rank`
crawshaw.io `span.titleline > span.sitebit > a > span.sitestr`
340 points by bumbledraven 5 hours ago \| hide \| 161 comments `tbody > tr > td.subtext > span.subline`
340 points `tr > td.subtext > span.subline > span#score_47872324`
bumbledraven `tr > td.subtext > span.subline > a.hnuser`
5 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
161 comments `tr > td.subtext > span.subline > a`
2. `tbody > tr#47865868 > td.title > span.rank`
wheelfront.com `span.titleline > span.sitebit > a > span.sitestr`
1766 points by Kaibeezy 17 hours ago \| hide \| 562 comments `tbody > tr > td.subtext > span.subline`
1766 points `tr > td.subtext > span.subline > span#score_47865868`
Kaibeezy `tr > td.subtext > span.subline > a.hnuser`
17 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
562 comments `tr > td.subtext > span.subline > a`
3. `tbody > tr#47846688 > td.title > span.rank`
simonomi.dev `span.titleline > span.sitebit > a > span.sitestr`
72 points by tobr 3 hours ago \| hide \| 9 comments `tbody > tr > td.subtext > span.subline`
72 points `tr > td.subtext > span.subline > span#score_47846688`
tobr `tr > td.subtext > span.subline > a.hnuser`
3 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
9 comments `tr > td.subtext > span.subline > a`
4. `tbody > tr#47868867 > td.title > span.rank`
techcrunch.com `span.titleline > span.sitebit > a > span.sitestr`
601 points by cdrnsf 13 hours ago \| hide \| 147 comments `tbody > tr > td.subtext > span.subline`
601 points `tr > td.subtext > span.subline > span#score_47868867`
cdrnsf `tr > td.subtext > span.subline > a.hnuser`
13 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
147 comments `tr > td.subtext > span.subline > a`
5. `tbody > tr#47866697 > td.title > span.rank`
fingerprint.com `span.titleline > span.sitebit > a > span.sitestr`
696 points by danpinto 16 hours ago \| hide \| 196 comments `tbody > tr > td.subtext > span.subline`
696 points `tr > td.subtext > span.subline > span#score_47866697`
danpinto `tr > td.subtext > span.subline > a.hnuser`
16 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
196 comments `tr > td.subtext > span.subline > a`
6. `tbody > tr#47824943 > td.title > span.rank`
maurycyz.com `span.titleline > span.sitebit > a > span.sitestr`
624 points by zdw 17 hours ago \| hide \| 129 comments `tbody > tr > td.subtext > span.subline`
624 points `tr > td.subtext > span.subline > span#score_47824943`
zdw `tr > td.subtext > span.subline > a.hnuser`
17 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
129 comments `tr > td.subtext > span.subline > a`
7. `tbody > tr#47872452 > td.title > span.rank`
arstechnica.com `span.titleline > span.sitebit > a > span.sitestr`
49 points by zdw 4 hours ago \| hide \| 33 comments `tbody > tr > td.subtext > span.subline`
49 points `tr > td.subtext > span.subline > span#score_47872452`
zdw `tr > td.subtext > span.subline > a.hnuser`
4 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
33 comments `tr > td.subtext > span.subline > a`
8. `tbody > tr#47846718 > td.title > span.rank`
quantamagazine.org `span.titleline > span.sitebit > a > span.sitestr`
76 points by Prof_Sigmund 6 hours ago \| hide \| 14 comments `tbody > tr > td.subtext > span.subline`
76 points `tr > td.subtext > span.subline > span#score_47846718`
Prof_Sigmund `tr > td.subtext > span.subline > a.hnuser`
6 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
14 comments `tr > td.subtext > span.subline > a`
9. `tbody > tr#47843434 > td.title > span.rank`
nytimes.com `span.titleline > span.sitebit > a > span.sitestr`
158 points by lxm 6 hours ago \| hide \| 40 comments `tbody > tr > td.subtext > span.subline`
158 points `tr > td.subtext > span.subline > span#score_47843434`
lxm `tr > td.subtext > span.subline > a.hnuser`
6 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
40 comments `tr > td.subtext > span.subline > a`
10. `tbody > tr#47866913 > td.title > span.rank`
nrehiew.github.io `span.titleline > span.sitebit > a > span.sitestr`
363 points by pella 15 hours ago \| hide \| 206 comments `tbody > tr > td.subtext > span.subline`
363 points `tr > td.subtext > span.subline > span#score_47866913`
pella `tr > td.subtext > span.subline > a.hnuser`
15 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
206 comments `tr > td.subtext > span.subline > a`
11. `tbody > tr#47871195 > td.title > span.rank`
homemade.systems `span.titleline > span.sitebit > a > span.sitestr`
74 points by mwenge 8 hours ago \| hide \| 24 comments `tbody > tr > td.subtext > span.subline`
74 points `tr > td.subtext > span.subline > span#score_47871195`
mwenge `tr > td.subtext > span.subline > a.hnuser`
8 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
24 comments `tr > td.subtext > span.subline > a`
12. `tbody > tr#47867048 > td.title > span.rank`
flipbook.page `span.titleline > span.sitebit > a > span.sitestr`
279 points by sethbannon 14 hours ago \| hide \| 77 comments `tbody > tr > td.subtext > span.subline`
279 points `tr > td.subtext > span.subline > span#score_47867048`
sethbannon `tr > td.subtext > span.subline > a.hnuser`
14 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
77 comments `tr > td.subtext > span.subline > a`
13. `tbody > tr#47873517 > td.title > span.rank`
vuseum.wordpress.com `span.titleline > span.sitebit > a > span.sitestr`
6 points by kome 1 hour ago \| hide \| 1 comment `tbody > tr > td.subtext > span.subline`
6 points `tr > td.subtext > span.subline > span#score_47873517`
kome `tr > td.subtext > span.subline > a.hnuser`
1 hour ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
1 comment `tr > td.subtext > span.subline > a`
14. `tbody > tr#47865661 > td.title > span.rank`
martinfowler.com `span.titleline > span.sitebit > a > span.sitestr`
264 points by theorchid 17 hours ago \| hide \| 68 comments `tbody > tr > td.subtext > span.subline`
264 points `tr > td.subtext > span.subline > span#score_47865661`
theorchid `tr > td.subtext > span.subline > a.hnuser`
17 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
68 comments `tr > td.subtext > span.subline > a`
15. `tbody > tr#47847153 > td.title > span.rank`
bookdna.com `span.titleline > span.sitebit > a > span.sitestr`
14 points by bwb 3 hours ago \| hide \| 12 comments `tbody > tr > td.subtext > span.subline`
14 points `tr > td.subtext > span.subline > span#score_47847153`
bwb `tr > td.subtext > span.subline > a.hnuser`
3 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
12 comments `tr > td.subtext > span.subline > a`
16. `tbody > tr#47871519 > td.title > span.rank`
antiz.fr `span.titleline > span.sitebit > a > span.sitestr`
55 points by maxloh 7 hours ago \| hide \| 10 comments `tbody > tr > td.subtext > span.subline`
55 points `tr > td.subtext > span.subline > span#score_47871519`
maxloh `tr > td.subtext > span.subline > a.hnuser`
7 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
10 comments `tr > td.subtext > span.subline > a`
17. `tbody > tr#47823655 > td.title > span.rank`
spritetm.github.io `span.titleline > span.sitebit > a > span.sitestr`
19 points by hggh 5 hours ago \| hide \| 2 comments `tbody > tr > td.subtext > span.subline`
19 points `tr > td.subtext > span.subline > span#score_47823655`
hggh `tr > td.subtext > span.subline > a.hnuser`
5 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
2 comments `tr > td.subtext > span.subline > a`
18. `tbody > tr#47864785 > td.title > span.rank`
reuters.com `span.titleline > span.sitebit > a > span.sitestr`
120 points by wslh 13 hours ago \| hide \| 145 comments `tbody > tr > td.subtext > span.subline`
120 points `tr > td.subtext > span.subline > span#score_47864785`
wslh `tr > td.subtext > span.subline > a.hnuser`
13 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
145 comments `tr > td.subtext > span.subline > a`
19. `tbody > tr#47866750 > td.title > span.rank`
zed.dev `span.titleline > span.sitebit > a > span.sitestr`
228 points by ajeetdsouza 16 hours ago \| hide \| 122 comments `tbody > tr > td.subtext > span.subline`
228 points `tr > td.subtext > span.subline > span#score_47866750`
ajeetdsouza `tr > td.subtext > span.subline > a.hnuser`
16 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
122 comments `tr > td.subtext > span.subline > a`
20. `tbody > tr#47863217 > td.title > span.rank`
qwen.ai `span.titleline > span.sitebit > a > span.sitestr`
844 points by mfiguiere 20 hours ago \| hide \| 391 comments `tbody > tr > td.subtext > span.subline`
844 points `tr > td.subtext > span.subline > span#score_47863217`
mfiguiere `tr > td.subtext > span.subline > a.hnuser`
20 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
391 comments `tr > td.subtext > span.subline > a`
21. `tbody > tr#47864393 > td.title > span.rank`
adriankrebs.ch `span.titleline > span.sitebit > a > span.sitestr`
308 points by hubraumhugo 19 hours ago \| hide \| 220 comments `tbody > tr > td.subtext > span.subline`
308 points `tr > td.subtext > span.subline > span#score_47864393`
hubraumhugo `tr > td.subtext > span.subline > a.hnuser`
19 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
220 comments `tr > td.subtext > span.subline > a`
22. `tbody > tr#47840252 > td.title > span.rank`
verus-lang.github.io `span.titleline > span.sitebit > a > span.sitestr`
56 points by fanf2 8 hours ago \| hide \| 10 comments `tbody > tr > td.subtext > span.subline`
56 points `tr > td.subtext > span.subline > span#score_47840252`
fanf2 `tr > td.subtext > span.subline > a.hnuser`
8 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
10 comments `tr > td.subtext > span.subline > a`
23. `tbody > tr#47863324 > td.title > span.rank`
psu.edu `span.titleline > span.sitebit > a > span.sitestr`
232 points by t-3 20 hours ago \| hide \| 65 comments `tbody > tr > td.subtext > span.subline`
232 points `tr > td.subtext > span.subline > span#score_47863324`
t-3 `tr > td.subtext > span.subline > a.hnuser`
20 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
65 comments `tr > td.subtext > span.subline > a`
24. `tbody > tr#47871817 > td.title > span.rank`
scattered-thoughts.net `span.titleline > span.sitebit > a > span.sitestr`
58 points by jamii 6 hours ago \| hide \| 15 comments `tbody > tr > td.subtext > span.subline`
58 points `tr > td.subtext > span.subline > span#score_47871817`
jamii `tr > td.subtext > span.subline > a.hnuser`
6 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
15 comments `tr > td.subtext > span.subline > a`
25. `tbody > tr#47812649 > td.title > span.rank`
bodegacatsofnewyork.com `span.titleline > span.sitebit > a > span.sitestr`
195 points by zdw 18 hours ago \| hide \| 78 comments `tbody > tr > td.subtext > span.subline`
195 points `tr > td.subtext > span.subline > span#score_47812649`
zdw `tr > td.subtext > span.subline > a.hnuser`
18 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
78 comments `tr > td.subtext > span.subline > a`
26. `tbody > tr#47848981 > td.title > span.rank`
ieee.org `span.titleline > span.sitebit > a > span.sitestr`
4 points by defrost 2 hours ago \| hide \| discuss `tbody > tr > td.subtext > span.subline`
4 points `tr > td.subtext > span.subline > span#score_47848981`
defrost `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`
27. `tbody > tr#47861270 > td.title > span.rank`
hails.org `span.titleline > span.sitebit > a > span.sitestr`
955 points by sohkamyung 23 hours ago \| hide \| 226 comments `tbody > tr > td.subtext > span.subline`
955 points `tr > td.subtext > span.subline > span#score_47861270`
sohkamyung `tr > td.subtext > span.subline > a.hnuser`
23 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
226 comments `tr > td.subtext > span.subline > a`
28. `tbody > tr#47866860 > td.title > span.rank`
openai.com `span.titleline > span.sitebit > a > span.sitestr`
137 points by mfiguiere 15 hours ago \| hide \| 52 comments `tbody > tr > td.subtext > span.subline`
137 points `tr > td.subtext > span.subline > span#score_47866860`
mfiguiere `tr > td.subtext > span.subline > a.hnuser`
15 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
52 comments `tr > td.subtext > span.subline > a`
29. `tbody > tr#47864011 > td.title > span.rank`
resobscura.substack.com `span.titleline > span.sitebit > a > span.sitestr`
39 points by benbreen 9 hours ago \| hide \| 2 comments `tbody > tr > td.subtext > span.subline`
39 points `tr > td.subtext > span.subline > span#score_47864011`
benbreen `tr > td.subtext > span.subline > a.hnuser`
9 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
2 comments `tr > td.subtext > span.subline > a`
30. `tbody > tr#47840618 > td.title > span.rank`
slate.com `span.titleline > span.sitebit > a > span.sitestr`
151 points by danso 18 hours ago \| hide \| 143 comments `tbody > tr > td.subtext > span.subline`
151 points `tr > td.subtext > span.subline > span#score_47840618`
danso `tr > td.subtext > span.subline > a.hnuser`
18 hours ago `td.subtext > span.subline > span.age > a`
hide `tr > td.subtext > span.subline > a`
143 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 > 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
Hacker News `td > span.pagetop > b.hnname > a`

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 > 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`