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Lighthouse Desktop

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

Audit breakdown by category with detailed findings.

36

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.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:47.74 source:map[type:text value:[unattributed]]]]

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

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

RequestCache TTLTransfer Size
cdn.cookielaw.org/scripttemplates/202501.2.0/otBannerSdk.js86400.0 s114.5 KiB
/design-assets/assets/v3.176.0/illustrations-traveller/Ge...0.0 ms19.0 KiB
/design-assets/assets/v3.176.0/illustrations-traveller/Tr...0.0 ms18.8 KiB
/js/ld/ld.js?an=web-booking.com&cn=sg&ln=en&fpid=0069e119...10800.0 s25.0 KiB
/js/ld/ld.js?an=web-booking.agoda.com&cn=sg&ln=en&fpid=00...10800.0 s25.0 KiB
/js/ld/ld.js?an=web-booking.com.offsite&cn=sg&ln=en&fpid=...10800.0 s24.7 KiB
js.adsrvr.org/up_loader.1.1.0.js0.0 ms12.3 KiB
/design-assets/assets/v3.176.0/illustrations-traveller/Fr...0.0 ms10.9 KiB
s.yimg.jp/images/listing/tool/cv/ytag.js600.0 s11.8 KiB
/design-assets/assets/v3.176.0/illustrations-traveller/Re...0.0 ms5.6 KiB
bstatic.com/libs/google-one-tap/0.8.0/google-one-tap.min.js0.0 ms4.1 KiB
/design-assets/assets/v3.176.0/illustrations-traveller/Cu...0.0 ms4.0 KiB
cdn.cookielaw.org/scripttemplates/otSDKStub.js86400.0 s9.1 KiB
t-cf.bstatic.com/design-assets/assets/v3.176.0/images-flags/Us@3x.png0.0 ms1.5 KiB
cdn.cookielaw.org/consent/3ea94870-d4b1-483a-b1d2-faf1d982bb31/OtAutoBlock.js86400.0 s3.5 KiB
t-cf.bstatic.com/design-assets/assets/v3.176.0/images-flags/Kr.png0.0 ms983 B
js.adsrvr.org/universal_pixel.js0.0 ms957 B
t-cf.bstatic.com/design-assets/assets/v3.176.0/images-flags/My.png0.0 ms873 B
t-cf.bstatic.com/design-assets/assets/v3.176.0/images-flags/Sg.png0.0 ms803 B
t-cf.bstatic.com/design-assets/assets/v3.176.0/images-flags/Jp.png0.0 ms797 B
t-cf.bstatic.com/design-assets/assets/v3.176.0/images-flags/Th.png0.0 ms710 B

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLResource SizeEst Savings
div.e6fe25fa54 > div.cfbcaf5985 > picture.b7a691c583 > img.f6c12c77eb div.e6fe25fa54 > div.cfbcaf5985 > picture.b7a691c583 > img.f6c12c77eb
/xdata/images/city/600x600/654416.jpg?k=2d4f5298af4f498d7...83.5 KiB62.8 KiB
div.e6fe25fa54 > div.cfbcaf5985 > picture.b7a691c583 > img.f6c12c77eb div.e6fe25fa54 > div.cfbcaf5985 > picture.b7a691c583 > img.f6c12c77eb
/xdata/images/city/600x600/999979.jpg?k=0ca6e06931e03ae1a...76.3 KiB47.1 KiB
div.e6fe25fa54 > div.cfbcaf5985 > picture.b7a691c583 > img.f6c12c77eb div.e6fe25fa54 > div.cfbcaf5985 > picture.b7a691c583 > img.f6c12c77eb
/xdata/images/city/600x600/685705.jpg?k=2a9e7fbb97e6490d6...53.3 KiB32.6 KiB
div.e6fe25fa54 > div.cfbcaf5985 > picture.b7a691c583 > img.f6c12c77eb div.e6fe25fa54 > div.cfbcaf5985 > picture.b7a691c583 > img.f6c12c77eb
/xdata/images/city/600x600/1000147.jpg?k=090a126ebc31a434...44.6 KiB23.9 KiB
div.e6fe25fa54 > div.cfbcaf5985 > picture.b7a691c583 > img.f6c12c77eb div.e6fe25fa54 > div.cfbcaf5985 > picture.b7a691c583 > img.f6c12c77eb
/xdata/images/city/600x600/1000154.jpg?k=383e9f369b2335cb...53.0 KiB23.7 KiB
div.f6e3a11b0d > div.c3bdfd4ac2 > picture.b7a691c583 > img.f6c12c77eb div.f6e3a11b0d > div.c3bdfd4ac2 > picture.b7a691c583 > img.f6c12c77eb
/design-assets/assets/v3.176.0/illustrations-traveller/Tr...18.2 KiB17.7 KiB
div.f6e3a11b0d > div.f6e3a11b0d > picture.b7a691c583 > img.f6c12c77eb div.f6e3a11b0d > div.f6e3a11b0d > picture.b7a691c583 > img.f6c12c77eb
/design-assets/assets/v3.176.0/illustrations-traveller/Ge...18.4 KiB16.9 KiB
div.f6e3a11b0d > div.c3bdfd4ac2 > picture.b7a691c583 > img.f6c12c77eb div.f6e3a11b0d > div.c3bdfd4ac2 > picture.b7a691c583 > img.f6c12c77eb
/design-assets/assets/v3.176.0/illustrations-traveller/Fr...10.3 KiB6.8 KiB

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.

URLTransfer SizeDuration
cdn.cookielaw.org/consent/3ea94870-d4b1-483a-b1d2-faf1d982bb31/OtAutoBlock.js3.5 KiB225 ms
cf.bstatic.com/psb/capla/static/css/dceb1327.db0950d9.chunk.css3.8 KiB
cf.bstatic.com/psb/capla/static/css/31e40d2f.1e84e7a6.chunk.css1.1 KiB
cf.bstatic.com/psb/capla/static/css/7e8161ba.cdb36326.chunk.css1.5 KiB
cf.bstatic.com/psb/capla/static/css/27bbaa9c.e65278ae.chunk.css1.0 KiB
cf.bstatic.com/psb/capla/static/css/0d919837.59e18d47.chunk.css6.9 KiB
cf.bstatic.com/psb/capla/static/css/0fdff3cd.2d5a1a4b.chunk.css834 B
cf.bstatic.com/psb/capla/static/css/38055147.ba0a9427.chunk.css1.6 KiB
cf.bstatic.com/psb/capla/static/css/8067d7e4.dbb1072a.chunk.css745 B
cf.bstatic.com/psb/capla/static/css/1d87ea19.fb53800c.chunk.css1.1 KiB
cf.bstatic.com/psb/capla/static/css/09fb2abd.275826ae.chunk.css884 B
cf.bstatic.com/psb/capla/static/css/18cad957.dbb1072a.chunk.css743 B
cf.bstatic.com/psb/capla/static/css/2ab355fc.6cc431cc.chunk.css1.0 KiB
cf.bstatic.com/psb/capla/static/css/ba07265b.4eea9547.chunk.css905 B
cf.bstatic.com/psb/capla/static/css/c2edf532.4b5a0e7f.chunk.css3.1 KiB
cf.bstatic.com/psb/capla/static/css/ca95e682.b48e0f75.chunk.css1.0 KiB
cf.bstatic.com/psb/capla/static/css/c43f530f.6af8176f.chunk.css3.3 KiB
cf.bstatic.com/psb/capla/static/css/829f8fa8.bb18d79f.chunk.css1.5 KiB
cf.bstatic.com/psb/capla/static/css/client.01f0d2ae.css32.0 KiB299 ms
cf.bstatic.com/psb/capla/static/css/12888182.7b57f4b9.chunk.css1.9 KiB
cf.bstatic.com/psb/capla/static/css/31b24ea7.7433a648.chunk.css936 B
cf.bstatic.com/psb/capla/static/css/967ac2a3.7b8bcbee.chunk.css813 B
cf.bstatic.com/psb/capla/static/css/6e9462b2.58087283.chunk.css1.4 KiB
cf.bstatic.com/psb/capla/static/css/81da5f32.89ae8754.chunk.css3.3 KiB
cf.bstatic.com/psb/capla/static/css/b9a82cb8.28b83939.chunk.css3.1 KiB
cf.bstatic.com/psb/capla/static/css/dc32f6b7.2e0b6b1e.chunk.css4.0 KiB
cf.bstatic.com/psb/capla/static/css/782ad794.af081227.chunk.css1.3 KiB
cf.bstatic.com/psb/capla/static/css/a0742a16.9eef7d9f.chunk.css1.4 KiB
cf.bstatic.com/psb/capla/static/css/2bda684b.5ede15fb.chunk.css733 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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 2.4 s
URLTime Spent
booking.com/1.3 s
www.booking.com/1.1 s
www.booking.com/?chal_t=1776359895891&force_referer=0.0 ms

Keep the server response time for the main document short because all other requests depend on it. Learn more about the Time to First Byte metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 701 ms
URLTime Spent
www.booking.com/?chal_t=1776359895891&force_referer=801 ms

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Diagnostics

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTotal CPU TimeScript EvaluationScript Parse
cf.bstatic.com/psb/capla/static/js/client.1572d987.js1.4 s1.1 s65 ms
www.booking.com/?chal_t=1776359895891&force_referer=550 ms49 ms2.0 ms
Unattributable474 ms106 ms0.0 ms
www.googletagmanager.com/gtm.js?id=GTM-5Q664QZ311 ms254 ms24 ms
d8c14d4960ca.edge.sdk.awswaf.com/d8c14d4960ca/a18a4859af9c/challenge.js309 ms246 ms50 ms
cf.bstatic.com/psb/capla/static/js/782ad794.ea2f5e5f.chunk.js271 ms233 ms31 ms
/__challenge_h78IRKX3kpQxScCExxShBNwRUlb/d8c14d4960ca/a18...258 ms190 ms46 ms
/pagead/managed/js/gpt/m202604140101/pubads_impl.js?cb=31...194 ms165 ms20 ms
cf.bstatic.com/psb/capla/static/js/remoteEntry.eeebe667.client.js125 ms124 ms0.8 ms
www.googletagmanager.com/gtag/js?id=G-A12345&cx=c&gtm=4e64f0&bs=ctrl107 ms92 ms13 ms
/psb/capla/static/js/node_modules_bookingcom_bui-react_co...103 ms101 ms0.1 ms
/gtag/destination?id=AW-988382855&cx=c&gtm=4e64f0&bs=ctrl97 ms74 ms22 ms
cf.bstatic.com/psb/capla/static/js/36086793.b1610857.chunk.js70 ms69 ms0.3 ms
www.googletagmanager.com/gtag/destination?id=DC-4228414&cx=c&gtm=4e64f0&bs=ctrl63 ms50 ms12 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

Why this matters

Performance issues directly impact user engagement and conversion rates.

CategoryTime Spent
Script Evaluation3.1 s
Other593 ms
Script Parsing & Compilation522 ms
Style & Layout380 ms
Garbage Collection113 ms
Rendering90 ms
Parse HTML & CSS54 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 1.7 MiB
URLTransfer SizeEst Savings
d8c14d4960ca.edge.sdk.awswaf.com/d8c14d4960ca/a18a4859af9c/challenge.js489.0 KiB283.5 KiB
cf.bstatic.com/psb/capla/static/js/782ad794.ea2f5e5f.chunk.js223.6 KiB215.2 KiB
cf.bstatic.com/psb/capla/static/js/client.1572d987.js408.3 KiB176.5 KiB
cf.bstatic.com/psb/capla/static/js/c43f530f.2815a552.chunk.js223.0 KiB142.9 KiB
cf.bstatic.com/psb/capla/static/js/dc32f6b7.6d16fe38.chunk.js158.9 KiB122.5 KiB
/pagead/managed/js/gpt/m202604140101/pubads_impl.js?cb=31...187.7 KiB107.3 KiB
cf.bstatic.com/psb/capla/static/js/dceb1327.9d726c05.chunk.js121.3 KiB77.9 KiB
cdn.cookielaw.org/scripttemplates/202501.2.0/otBannerSdk.js114.3 KiB73.9 KiB
www.googletagmanager.com/gtag/destination?id=DC-4228414&cx=c&gtm=4e64f0&bs=ctrl129.8 KiB61.9 KiB
/gtag/destination?id=AW-988382855&cx=c&gtm=4e64f0&bs=ctrl145.9 KiB61.0 KiB
www.googletagmanager.com/gtag/js?id=G-A12345&cx=c&gtm=4e64f0&bs=ctrl136.6 KiB59.2 KiB
cf.bstatic.com/psb/capla/static/js/81da5f32.6979dec3.chunk.js122.1 KiB55.3 KiB
www.googletagmanager.com/gtm.js?id=GTM-5Q664QZ180.5 KiB49.3 KiB
cf.bstatic.com/psb/capla/static/js/0d919837.66c61e43.chunk.js126.6 KiB38.7 KiB
cf.bstatic.com/psb/capla/static/js/c2edf532.9c32f813.chunk.js55.7 KiB36.0 KiB
cf.bstatic.com/psb/capla/static/js/b9a82cb8.3e27c878.chunk.js37.2 KiB32.6 KiB
cf.bstatic.com/psb/capla/static/js/ba07265b.3a221309.chunk.js33.7 KiB32.1 KiB
cf.bstatic.com/psb/capla/static/js/18cad957.6daa46db.chunk.js26.8 KiB26.3 KiB
cf.bstatic.com/psb/capla/static/js/2ab355fc.de3e1175.chunk.js24.9 KiB23.2 KiB
/js/ld/ld.js?an=web-booking.agoda.com&cn=sg&ln=en&fpid=00...24.7 KiB21.8 KiB
/js/ld/ld.js?an=web-booking.com.offsite&cn=sg&ln=en&fpid=...24.4 KiB21.7 KiB
cf.bstatic.com/psb/capla/static/js/12888182.c76f8bcb.chunk.js24.9 KiB20.7 KiB

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer Size
/__challenge_h78IRKX3kpQxScCExxShBNwRUlb/d8c14d4960ca/a18...505.8 KiB
d8c14d4960ca.edge.sdk.awswaf.com/d8c14d4960ca/a18a4859af9c/challenge.js489.3 KiB
cf.bstatic.com/psb/capla/static/js/client.1572d987.js408.8 KiB
cf.bstatic.com/psb/capla/static/js/782ad794.ea2f5e5f.chunk.js224.1 KiB
cf.bstatic.com/psb/capla/static/js/c43f530f.2815a552.chunk.js223.5 KiB
/pagead/managed/js/gpt/m202604140101/pubads_impl.js?cb=31...187.7 KiB
www.googletagmanager.com/gtm.js?id=GTM-5Q664QZ180.9 KiB
cf.bstatic.com/psb/capla/static/js/dc32f6b7.6d16fe38.chunk.js159.4 KiB
/gtag/destination?id=AW-988382855&cx=c&gtm=4e64f0&bs=ctrl146.0 KiB
www.googletagmanager.com/gtag/js?id=G-A12345&cx=c&gtm=4e64f0&bs=ctrl136.7 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
div.f6e3a11b0d > div.f6e3a11b0d > picture.b7a691c583 > img.f6c12c77eb div.f6e3a11b0d > div.f6e3a11b0d > picture.b7a691c583 > img.f6c12c77eb
/design-assets/assets/v3.176.0/illustrations-traveller/Ge...
div.ecb8d66605 > div.a4ac75716e > picture.b7a691c583 > img.f6c12c77eb div.ecb8d66605 > div.a4ac75716e > picture.b7a691c583 > img.f6c12c77eb
t-cf.bstatic.com/design-assets/assets/v3.176.0/images-flags/Sg.png
div.ecb8d66605 > div.a4ac75716e > picture.b7a691c583 > img.f6c12c77eb div.ecb8d66605 > div.a4ac75716e > picture.b7a691c583 > img.f6c12c77eb
t-cf.bstatic.com/design-assets/assets/v3.176.0/images-flags/Jp.png
div.ecb8d66605 > div.a4ac75716e > picture.b7a691c583 > img.f6c12c77eb div.ecb8d66605 > div.a4ac75716e > picture.b7a691c583 > img.f6c12c77eb
t-cf.bstatic.com/design-assets/assets/v3.176.0/images-flags/My.png
div.ecb8d66605 > div.a4ac75716e > picture.b7a691c583 > img.f6c12c77eb div.ecb8d66605 > div.a4ac75716e > picture.b7a691c583 > img.f6c12c77eb
t-cf.bstatic.com/design-assets/assets/v3.176.0/images-flags/Th.png
div.ecb8d66605 > div.a4ac75716e > picture.b7a691c583 > img.f6c12c77eb div.ecb8d66605 > div.a4ac75716e > picture.b7a691c583 > img.f6c12c77eb
t-cf.bstatic.com/design-assets/assets/v3.176.0/images-flags/Kr.png

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
●Reduce unused CSS
●User Timing marks and measures 18 user timings
●Avoid long main-thread tasks 18 long tasks found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 240 ms
●Server Backend Latencies 1,080 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Avoid large layout shifts 9 layout shifts found
○INP breakdown
○LCP request discovery
○Avoid non-composited animations
100

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.

○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
●Buttons have an accessible name
●`[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
●Background and foreground colors have a sufficient contrast ratio
●Document has a `<title>` element
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Links have a discernible name
●Touch targets have sufficient size and spacing.
●Heading elements appear in a sequentially-descending order
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Uses ARIA roles only on compatible elements
○`[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
○`<frame>` or `<iframe>` elements have a title
○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
○Image elements have `[alt]` attributes
○Input buttons have discernible text.
○`<input type="image">` elements have `[alt]` text
○Form elements have associated labels
○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
○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.
○Image elements do not have `[alt]` attributes that are redundant text.
○Identical links have the same purpose.
○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.
96

Best Practices

General

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit

Why this matters

Performance issues directly impact user engagement and conversion rates.

SourceDescription
www.booking.com/favicon.ico
Failed to load resource: the server responded with a status of 404 ()

Source maps translate minified code to the original source code. This helps developers debug in production. In addition, Lighthouse is able to provide further insights. Consider deploying source maps to take advantage of these benefits. Learn more about source maps.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLMap URL
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●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 issues in the `Issues` panel in Chrome Devtools
●Ensure CSP is effective against XSS attacks
●Mitigate clickjacking with XFO or CSP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
○Redirects HTTP traffic to HTTPS
○Use a strong HSTS policy
○Ensure proper origin isolation with COOP
100

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.

○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`
○Image elements have `[alt]` attributes

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