C — https://www.stackoverflow.blog

Site Health

Score: 74 / 100

Based on 8 categories, 0 sections

How is this calculated?

The overall score is a weighted average of individual category scores. Categories with more impact on user experience and security carry more weight.

Performance 25%Security 25%Accessibility 15%SEO 10%Infrastructure 10%Compliance 8%Content 5%Sustainability 2%

Weights reflect general web best practices. Individual needs may differ.

Top Priorities (5)

Content-Security-Policy header is missing

Security › Security Headers

No Content-Security-Policy header found

Security › Content Security Policy

16 image(s) missing alt attribute

Accessibility › Alt Text Quality

16 image-in-link without alt text

Accessibility › Alt Text Quality

19 button(s) with no accessible text

Accessibility › Link & Button Quality

Embed this badge

Markdown

[![BeaverCheck](https://beavercheck.com/badge?url=https%3A%2F%2Fwww.stackoverflow.blog)](https://beavercheck.com/results/ca30dec9-0574-6860-cf9c-f965ecc2c866)

HTML

<a href="https://beavercheck.com/results/ca30dec9-0574-6860-cf9c-f965ecc2c866"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Fwww.stackoverflow.blog" alt="BeaverCheck Score"></a>

Image URL

https://beavercheck.com/badge?url=https%3A%2F%2Fwww.stackoverflow.blog

This badge auto-updates with your latest scan result.

Was this report useful?

Thanks for your feedback!

Press ? for shortcuts

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse.

Performance

Accessibility

100

Best Practices

SEO

Core Web Vitals

Key metrics that affect user experience.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

5.72 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

9.72 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

689 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

5.76 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

9.74 s

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

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

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

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

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Request	Cache TTL	Transfer Size
/assets/2025/07/25/1c6634e0-2297-41f6-8b60-0ef808e774ee/v...	300.0 s	120.8 KiB
cdn.cookielaw.org/scripttemplates/202402.1.0/otBannerSdk.js	86400.0 s	104.9 KiB
/assets/2025/07/25/1c6634e0-2297-41f6-8b60-0ef808e774ee/v...	300.0 s	19.3 KiB
/assets/fonts/fontello-effa7ce16fec99765628d80aa7ccf970.w...	300.0 s	10.3 KiB
cdn.cookielaw.org/scripttemplates/otSDKStub.js	86400.0 s	9.1 KiB
cdn.cookielaw.org/logos/static/powered_by_logo.svg	86400.0 s	2.5 KiB
/logos/481fe84d-93cd-45d7-9ee5-d340809f8e77/019c52bd-74d3...	86400.0 s	1.8 KiB

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:9.016 source:map[column:70411 line:7 type:source-location url:https://cdn.cookielaw.org/scripttemplates/202402.1.0/otBannerSdk.js urlProvider:network]]]

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:81.346 source:map[type:text value:[unattributed]]] map[reflowTime:5.515 source:map[column:107503 line:3 type:source-location url:https://stackoverflow.blog/_nuxt/DSwynrvu.js urlProvider:network]] map[reflowTime:7.642 source:map[column:243994 line:6 type:source-location url:https://cdn.cookielaw.org/scripttemplates/202402.1.0/otBannerSdk.js urlProvider:network]] map[reflowTime:1.374 source:map[column:144770 line:6 type:source-location url:https://cdn.cookielaw.org/scripttemplates/202402.1.0/otBannerSdk.js urlProvider:network]]]

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

	URL	Resource Size	Est Savings
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`	/images/jo7n4k8s/production/7743f41e5318616af0c6940a0cbca...	41.3 KiB	35.2 KiB
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`	/images/jo7n4k8s/production/8be0e0ada7badb3660665438b7090...	40.6 KiB	34.6 KiB
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`	/images/jo7n4k8s/production/f1834895260e97545d127553d1e6d...	32.7 KiB	27.8 KiB
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`	/images/jo7n4k8s/production/763e9ddab1a6413e98e7d9defdde7...	28.4 KiB	24.2 KiB
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`	/images/jo7n4k8s/production/2b91cb6c6784765415373bfd00ceb...	26.0 KiB	22.2 KiB
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`	/images/jo7n4k8s/production/f48772b438e74d566ad424691a117...	24.5 KiB	20.9 KiB
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`	/images/jo7n4k8s/production/91526ba9be654c0fcee54b584ce12...	23.8 KiB	20.3 KiB
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`	/images/jo7n4k8s/production/729922dbacae77e1f253a93510119...	22.0 KiB	18.7 KiB
Article hero image `div.flex--item8 > article.h100 > a.fc-black > img.w100`	/images/jo7n4k8s/production/837a9d718f42041b365ee09f006b7...	19.4 KiB	18.3 KiB
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`	/images/jo7n4k8s/production/3040c9c18b08b62fc09c2160bba2a...	20.3 KiB	17.3 KiB
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`	/images/jo7n4k8s/production/751dae65e9dfa3fa920e2e69dd68f...	14.5 KiB	12.4 KiB

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

lhId: page-8-IMG

nodeLabel: Article hero image

path: 1,HTML,1,BODY,1,DIV,8,DIV,0,DIV,1,DIV,2,DIV,0,DIV,0,ARTICLE,0,A,0,IMG

selector: div.flex--item8 > article.h100 > a.fc-black > img.w100

snippet: <img src="https://cdn.stackoverflow.co/images/jo7n4k8s/production/837a9d718f42041b36…" width="1200" height="630" class="w100 h-auto d-block" alt="Article hero image" data-v-12fc49f7="">

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.

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

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

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.

URL	Transfer Size	Duration
stackoverflow.blog/_nuxt/Form.8a_KpaAF.css	215 B
stackoverflow.blog/_nuxt/entry.C5FHrHSy.css	32.9 KiB	451 ms
stackoverflow.blog/_nuxt/Modal.wb0ZfAGS.css	1.0 KiB
stackoverflow.blog/_nuxt/SanityContent.Cd-8twFf.css	913 B
stackoverflow.blog/_nuxt/Footer.myk009d4.css	734 B

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

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Estimated savings: 781 ms

URL	Time Spent
www.stackoverflow.blog/	781 ms
stackoverflow.blog/	0.0 ms

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

TTI

Diagnostics

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Estimated savings: 400 ms 45.7 KiB

URL	Transfer Size	Est Savings
stackoverflow.blog/_nuxt/entry.C5FHrHSy.css	32.8 KiB	28.9 KiB
#onetrust-banner-sdk{-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%} …	20.1 KiB	16.8 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Estimated savings: 900 ms 147.7 KiB

URL	Transfer Size	Est Savings
www.googletagmanager.com/gtag/js?id=G-DTTX7JCXEJ	150.9 KiB	62.4 KiB
cdn.cookielaw.org/scripttemplates/202402.1.0/otBannerSdk.js	104.6 KiB	56.1 KiB
stackoverflow.blog/_nuxt/DSwynrvu.js	81.0 KiB	29.2 KiB

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

URL	Total CPU Time	Script Evaluation	Script Parse
Unattributable	1.2 s	728 ms	0.0 ms
stackoverflow.blog/	753 ms	52 ms	2.9 ms
cdn.cookielaw.org/scripttemplates/202402.1.0/otBannerSdk.js	346 ms	255 ms	39 ms
www.googletagmanager.com/gtag/js?id=G-DTTX7JCXEJ	286 ms	216 ms	48 ms
stackoverflow.blog/_nuxt/DSwynrvu.js	52 ms	17 ms	1.3 ms

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Category	Time Spent
Script Evaluation	1.3 s
Other	645 ms
Style & Layout	634 ms
Parse HTML & CSS	115 ms
Script Parsing & Compilation	102 ms
Rendering	33 ms
Garbage Collection	31 ms

Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache

Failure reason	Failure type
The page has an unload handler in a sub frame.	Actionable

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Layout shift culprits

●Optimize DOM size

●Font display

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●Avoids enormous network payloads Total size was 1,269 KiB

●User Timing marks and measures 5 user timings

●Avoid long main-thread tasks 11 long tasks found

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

●Network Requests

●Network Round Trip Times 30 ms

●Server Backend Latencies 240 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 30 ms

○INP breakdown

○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.

ARIA

Some ARIA child roles must be contained by specific parent roles to properly perform their intended accessibility functions. Learn more about ARIA roles and required parent element.

Failing Elements
Search `form.print:d-none > div > div.d-none > button.s-topbar--item`

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Names and labels

When a button doesn't have an accessible name, screen readers announce it as "button", making it unusable for users who rely on screen readers. Learn how to make buttons more accessible.

Failing Elements
div.flex--item12 > div.pt24 > div.d-flex > button.bg-black-600 `div.flex--item12 > div.pt24 > div.d-flex > button.bg-black-600`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`

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.

Failing Elements
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`

Screen reader users rely on frame titles to describe the contents of frames. Learn more about frame titles.

Failing Elements
div.d-flex > div.flex--item4 > div.p24 > iframe.mt12 `div.d-flex > div.flex--item4 > div.p24 > iframe.mt12`

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.

Failing Elements
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`

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.

Contrast

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

Failing Elements
Everything `nav.fs-subheading > ul.list-reset > li.my4 > a.router-link-active`
Read previous issues → `div.d-flex > div.flex--item > p.mb12 > a.s-link`
or edit your settings on your profile page. `div.p-wrapper > div.d-flex > div.flex--item > a.mt12`
Accept all cookies `div#onetrust-button-group-parent > div#onetrust-button-group > div.banner-actions-container > button#onetrust-accept-btn-handler`
Necessary cookies only `div#onetrust-button-group-parent > div#onetrust-button-group > div.banner-actions-container > button#onetrust-reject-all-handler`
Customize settings `div.ot-sdk-row > div#onetrust-button-group-parent > div#onetrust-button-group > button#onetrust-pc-btn-handler`

These are opportunities to improve the legibility of your content.

Best practices

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

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-*]` attributes match their roles

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

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

●`[role]` values are valid

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

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

●Form elements have associated labels

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

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

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

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

●Elements use only permitted ARIA attributes

●Document has a `<title>` element

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

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

●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

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

●Touch targets have sufficient size and spacing.

●Heading elements appear in a sequentially-descending order

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

○`[accesskey]` values are unique

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

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

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

○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

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

○`<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

○`<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

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

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

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

○`<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.

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

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

100

Best Practices

●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

●Page has the HTML doctype

●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

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.

Failing Elements
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`

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

●Document has a meta description

●Page has successful HTTP status code

●Links have descriptive text

●Links are crawlable

●robots.txt is valid

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse. — Desktop

Performance

Accessibility

100

Best Practices

SEO

Core Web Vitals

Key metrics that affect user experience. — Desktop

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

880 ms

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

1.31 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

19 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.008

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

880 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.99 s

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

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

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

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:13.317 source:map[column:70411 line:7 type:source-location url:https://cdn.cookielaw.org/scripttemplates/202402.1.0/otBannerSdk.js urlProvider:network]]]

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:0.985 source:map[type:text value:[unattributed]]] map[reflowTime:11.86 source:map[column:243994 line:6 type:source-location url:https://cdn.cookielaw.org/scripttemplates/202402.1.0/otBannerSdk.js urlProvider:network]] map[reflowTime:0.28 source:map[column:244338 line:6 type:source-location url:https://cdn.cookielaw.org/scripttemplates/202402.1.0/otBannerSdk.js urlProvider:network]] map[reflowTime:1.177 source:map[column:144770 line:6 type:source-location url:https://cdn.cookielaw.org/scripttemplates/202402.1.0/otBannerSdk.js urlProvider:network]]]

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

lhId: page-0-IMG

nodeLabel: Article hero image

path: 1,HTML,1,BODY,1,DIV,8,DIV,0,DIV,1,DIV,2,DIV,0,DIV,0,ARTICLE,0,A,0,IMG

selector: div.flex--item8 > article.h100 > a.fc-black > img.w100

snippet: <img src="https://cdn.stackoverflow.co/images/jo7n4k8s/production/837a9d718f42041b36…" width="1200" height="630" class="w100 h-auto d-block" alt="Article hero image" data-v-12fc49f7="">

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.

title: Preconnected origins

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

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.

URL	Transfer Size	Duration
stackoverflow.blog/_nuxt/entry.C5FHrHSy.css	32.9 KiB	80 ms
stackoverflow.blog/_nuxt/SanityContent.Cd-8twFf.css	909 B
stackoverflow.blog/_nuxt/Form.8a_KpaAF.css	197 B
stackoverflow.blog/_nuxt/Modal.wb0ZfAGS.css	1.0 KiB
stackoverflow.blog/_nuxt/Footer.myk009d4.css	734 B

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Request	Cache TTL	Transfer Size
/assets/2025/07/25/1c6634e0-2297-41f6-8b60-0ef808e774ee/v...	300.0 s	120.8 KiB
cdn.cookielaw.org/scripttemplates/202402.1.0/otBannerSdk.js	86400.0 s	104.9 KiB
/assets/2025/07/25/1c6634e0-2297-41f6-8b60-0ef808e774ee/v...	300.0 s	19.3 KiB
/assets/fonts/fontello-effa7ce16fec99765628d80aa7ccf970.w...	300.0 s	10.3 KiB
cdn.cookielaw.org/scripttemplates/otSDKStub.js	86400.0 s	9.1 KiB
cdn.cookielaw.org/logos/static/powered_by_logo.svg	86400.0 s	2.6 KiB
/logos/481fe84d-93cd-45d7-9ee5-d340809f8e77/019c52bd-74d3...	86400.0 s	1.6 KiB

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

	URL	Resource Size	Est Savings
Article hero image `div.flex--item8 > article.h100 > a.fc-black > img.w100`	/images/jo7n4k8s/production/837a9d718f42041b365ee09f006b7...	19.4 KiB	11.8 KiB

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

Diagnostics

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Estimated savings: 0.0 ms 45.7 KiB

URL	Transfer Size	Est Savings
stackoverflow.blog/_nuxt/entry.C5FHrHSy.css	32.8 KiB	29.0 KiB
#onetrust-banner-sdk{-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%} …	20.1 KiB	16.7 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Estimated savings: 0.0 ms 148.4 KiB

URL	Transfer Size	Est Savings
www.googletagmanager.com/gtag/js?id=G-DTTX7JCXEJ	150.9 KiB	63.0 KiB
cdn.cookielaw.org/scripttemplates/202402.1.0/otBannerSdk.js	104.6 KiB	56.2 KiB
stackoverflow.blog/_nuxt/DSwynrvu.js	81.0 KiB	29.2 KiB

Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache

Failure reason	Failure type
The page has an unload handler in a sub frame.	Actionable

More information about the performance of your application. These numbers don't directly affect the Performance score.

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Estimated savings: 380 ms

URL	Time Spent
www.stackoverflow.blog/	380 ms
stackoverflow.blog/	0.0 ms

●Time to Interactive 2.0 s

●Max Potential First Input Delay 90 ms

●Layout shift culprits

●Optimize DOM size

●Font display

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●Avoids enormous network payloads Total size was 1,269 KiB

●User Timing marks and measures 5 user timings

●JavaScript execution time 0.3 s

●Minimizes main-thread work 0.6 s

●Avoid long main-thread tasks 1 long task found

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

●Network Requests

●Network Round Trip Times 50 ms

●Server Backend Latencies 260 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 30 ms

●Avoid large layout shifts 2 layout shifts found

○INP breakdown

○Avoid non-composited animations

Accessibility

Names and labels

When a button doesn't have an accessible name, screen readers announce it as "button", making it unusable for users who rely on screen readers. Learn how to make buttons more accessible.

Failing Elements
div.flex--item12 > div.pt24 > div.d-flex > button.bg-black-600 `div.flex--item12 > div.pt24 > div.d-flex > button.bg-black-600`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`
div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100 `div.flex--item6 > div.pt24 > div.d-flex > button.bg-black-100`

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.

Failing Elements
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`

Screen reader users rely on frame titles to describe the contents of frames. Learn more about frame titles.

Failing Elements
div.d-flex > div.flex--item4 > div.p24 > iframe.mt12 `div.d-flex > div.flex--item4 > div.p24 > iframe.mt12`

Failing Elements
div.p-wrapper > div.flex--item > div.sm:d-none > a.s-btn `div.p-wrapper > div.flex--item > div.sm:d-none > a.s-btn`
div.p-wrapper > div.flex--item > div.sm:d-none > a.s-btn `div.p-wrapper > div.flex--item > div.sm:d-none > a.s-btn`
div.p-wrapper > div.flex--item > div.sm:d-none > a.s-btn `div.p-wrapper > div.flex--item > div.sm:d-none > a.s-btn`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`
div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6 `div.flex--item8 > article.overflow-hidden > div.d-flex > a.flex--item6`

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.

Contrast

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

Failing Elements
Everything `nav.fs-subheading > ul.list-reset > li.my4 > a.router-link-active`
Read previous issues → `div.d-flex > div.flex--item > p.mb12 > a.s-link`
or edit your settings on your profile page. `div.p-wrapper > div.d-flex > div.flex--item > a.mt12`
Accept all cookies `div#onetrust-button-group-parent > div#onetrust-button-group > div.banner-actions-container > button#onetrust-accept-btn-handler`
Necessary cookies only `div#onetrust-button-group-parent > div#onetrust-button-group > div.banner-actions-container > button#onetrust-reject-all-handler`
Customize settings `div.ot-sdk-row > div#onetrust-button-group-parent > div#onetrust-button-group > button#onetrust-pc-btn-handler`

These are opportunities to improve the legibility of your content.

Best practices

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

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-*]` attributes match their roles

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

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

●`[role]` values are valid

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

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

●Form elements have associated labels

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

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

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

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

●Elements use only permitted ARIA attributes

●Document has a `<title>` element

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

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

●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

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

●Touch targets have sufficient size and spacing.

●Heading elements appear in a sequentially-descending order

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

○`[accesskey]` values are unique

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

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○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

○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

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

○`<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

○`<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

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

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

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

○`<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.

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

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

100

Best Practices

●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

●Page has the HTML doctype

●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

Content Best Practices

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.

Failing Elements
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`
article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md `article.overflow-hidden > div.d-flex > a.flex--item6 > img.bar-md`

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

●Document has a meta description

●Page has successful HTTP status code

●Links have descriptive text

●Links are crawlable

●robots.txt is valid

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

Browse & Analyze

Learn

Results for https://www.stackoverflow.blog

Site Health

Top Priorities (5)

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

ARIA

Names and labels

Contrast

Best practices

Best Practices

SEO

Content Best Practices

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

Names and labels

Contrast

Best practices

Best Practices

SEO

Content Best Practices

Keyboard Shortcuts