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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.

88

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.

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLEst Savings
m.media-amazon.com/images/S/sash/NvWNxKhmDbgI1lq.woff2110 ms
m.media-amazon.com/images/S/sash/1Ep1kWVX5g73xrY.woff2110 ms
m.media-amazon.com/images/S/sash/pnZF3$c0rgepEUt.woff2110 ms
m.media-amazon.com/images/S/sash/Wdqa3S7nfGc3Naj.woff2110 ms
m.media-amazon.com/images/S/sash/-w6hwcDxlefrOYI.woff2110 ms
m.media-amazon.com/images/S/sash/gyrV-mLs7VcgiFC.woff2110 ms
m.media-amazon.com/images/S/sash/8AuIu4whVB5EMoJ.woff2110 ms
m.media-amazon.com/images/S/sash/rlTCFdyUZFR9mQI.woff2110 ms
m.media-amazon.com/images/S/sash/ukoYNzKrqDRxhTq.woff2110 ms
m.media-amazon.com/images/S/sash/1yLvxs7jafx7AW$.woff2110 ms
m.media-amazon.com/images/S/sash/KwhNPG8Jz-Vz2X7.woff2105 ms
m.media-amazon.com/images/S/sash/lZemoC3awOEEzLR.woff2105 ms
m.media-amazon.com/images/S/sash/MexTn601PAhMvAn.woff2105 ms
m.media-amazon.com/images/S/sash/KFPk-9IF4FqAqY-.woff245 ms
m.media-amazon.com/images/S/sash/2SazJx$EeTHfhMN.woff245 ms
m.media-amazon.com/images/S/sash/ozb5-CLHQWI6Soc.woff245 ms
m.media-amazon.com/images/S/sash/VjTR4RqBzY0mUYx.woff235 ms
m.media-amazon.com/images/S/sash/WOnTLzkiaEccV7F.woff235 ms
m.media-amazon.com/images/S/sash/Dv1WQ5DdeMS5qP7.woff230 ms
m.media-amazon.com/images/S/sash/pDxWAF1pBB0dzGB.woff220 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-0-IMG
nodeLabel: Fire TV Stick 4K SELECT with remote control on a peach background. Text reads: …
path: 1,HTML,4,BODY,0,DIV,46,DIV,2,DIV,0,DIV,0,DIV,3,DIV,0,DIV,1,DIV,0,DIV,0,OL,3,LI,0,DIV,2,DIV,0,DIV,0,DIV,0,DIV,0,IMG
selector: div.a-section > div.a-section > div.a-section > img._cropped-image-map_style_fluidLandscapeImage__3eTVC
snippet: <img alt="Fire TV Stick 4K SELECT with remote control on a peach background. Text re…" src="https://m.media-amazon.com/images/I/515ad--yH0L._SX3000_.jpg" class="_cropped-image-map_style_fluidLandscapeImage__3eTVC _cropped-image-map_s…" data-a-hires="https://m.media-amazon.com/images/I/515ad--yH0L._SX3000_.jpg">

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
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.

URLTransfer SizeDuration
/images/I/51waPb-h-9L._RC|71VZyKb-gRL.css,41WcY5PbsbL.css...57.5 KiB56 ms
/images/I/11WsGYSItxL._RC|01DE6WSvLKL.css,41ixaNR85ML.css...34.9 KiB112 ms
m.media-amazon.com/images/I/413o2CUJ6GL.css?AUIClients/AmazonGatewayAuiAssets5.5 KiB
m.media-amazon.com/images/I/11J1WJh9jNL.js?AUIClients/PRIVCONAssets-stub2.0 KiB
/images/I/21skJF47J6L._RC|51Y8Xg9itbL.css_.css?AUIClients...7.4 KiB265 ms

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
/1/batch/1/OP/A1RKKUPIHCS9HS:525-2610402-9744523:45NR02XV...0.0 ms150 B
/1/batch/1/OP/A1RKKUPIHCS9HS:525-2610402-9744523:45NR02XV...0.0 ms150 B
/1/batch/1/OP/A1RKKUPIHCS9HS:525-2610402-9744523:45NR02XV...0.0 ms150 B
/1/batch/1/OP/A1RKKUPIHCS9HS:525-2610402-9744523:45NR02XV...0.0 ms149 B
/1/batch/1/OP/A1RKKUPIHCS9HS:525-2610402-9744523:45NR02XV...0.0 ms149 B
/1/batch/1/OP/A1RKKUPIHCS9HS:525-2610402-9744523:45NR02XV...0.0 ms149 B
/1/batch/1/OP/A1RKKUPIHCS9HS:525-2610402-9744523:45NR02XV...0.0 ms149 B
/1/batch/1/OP/A1RKKUPIHCS9HS:525-2610402-9744523:45NR02XV...0.0 ms149 B
/1/batch/1/OP/A1RKKUPIHCS9HS:525-2610402-9744523:45NR02XV...0.0 ms149 B
/1/batch/1/OP/A1RKKUPIHCS9HS:525-2610402-9744523:45NR02XV...0.0 ms149 B
/1/batch/1/OP/A1RKKUPIHCS9HS:525-2610402-9744523:45NR02XV...0.0 ms149 B
/1/batch/1/OP/A1RKKUPIHCS9HS:525-2610402-9744523:45NR02XV...0.0 ms149 B
/1/batch/1/OP/A1RKKUPIHCS9HS:525-2610402-9744523:45NR02XV...0.0 ms149 B
/1/batch/1/OP/A1RKKUPIHCS9HS:525-2610402-9744523:45NR02XV...0.0 ms148 B
/1/batch/1/OP/A1RKKUPIHCS9HS:525-2610402-9744523:45NR02XV...0.0 ms148 B
/1/batch/1/OP/A1RKKUPIHCS9HS:525-2610402-9744523:45NR02XV...0.0 ms148 B
/1/batch/1/OP/A1RKKUPIHCS9HS:525-2610402-9744523:45NR02XV...0.0 ms148 B
/rd/uedata?rid=45NR02XVGGHX7W2TP4D3&sid=525-2610402-97445...0.0 ms71 B
/rd/uedata?rid=45NR02XVGGHX7W2TP4D3&sid=525-2610402-97445...0.0 ms71 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
Fire TV Stick 4K SELECT with remote control on a peach background. Text reads: … div.a-section > div.a-section > div.a-section > img._cropped-image-map_style_fluidLandscapeImage__3eTVC
m.media-amazon.com/images/I/515ad--yH0L._SX3000_.jpg60.7 KiB45.6 KiB
Spain a.nav-a > span.icp-nav-link-inner > span.nav-line-2 > span.icp-nav-flag
m.media-amazon.com/images/S/sash/MAbi1rCjQI9H2y0.png44.3 KiB35.0 KiB
Microsoft Surface Pro | Copilot+ PC | 12" LCD Touchscreen | Snapdragon X Plus |… div.a-section > a.a-spacing-none > div.a-image-container > img
m.media-amazon.com/images/I/61dgLiC5C7L._AC_SY170_.jpg8.1 KiB5.9 KiB

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

Diagnostics

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: 280 ms 459.0 KiB
URLTransfer SizeEst Savings
/1c5c1ecf7303/be01910c327c/6c185aecd8cc/challenge.js500.8 KiB280.1 KiB
/images/I/51jC0T3AfxL._RC|71ekcYa0U8L.js,416IQz5llzL.js,0...122.2 KiB78.4 KiB
/images/I/11I0WXrZVoL._RC|11Y+5x+kkTL.js,518IfuPC2lL.js,1...68.8 KiB42.7 KiB
m.media-amazon.com/images/I/81kCF8wuZEL.js?AUIClients/FWCIMAssets56.3 KiB35.4 KiB
www.amazon.es/99.3 KiB22.5 KiB

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 27.5 KiB
URLTransfer SizeEst Savings
inline: //////////////////////////////////////…41.7 KiB17.6 KiB
/images/I/11sflnhgXuL._RC|61xgboVfIXL.js_.js?AUIClients/A...18.1 KiB7.9 KiB
inline: <!-- window.$Nav && $Nav.decla…15.2 KiB2.0 KiB

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 163.6 KiB
URLTransfer SizeEst Savings
/images/I/51waPb-h-9L._RC|71VZyKb-gRL.css,41WcY5PbsbL.css...103.9 KiB94.5 KiB
/images/I/11WsGYSItxL._RC|01DE6WSvLKL.css,41ixaNR85ML.css...50.8 KiB48.3 KiB
._quad-category-card_fluid_fluidCard__3hmFA{-webkit-box-orient:vertical; … } …11.0 KiB10.6 KiB
._quad-multi-asin-card-v2_fluid_fluidCard__3hmFA{-webkit-box-orient:vertical; … } …10.9 KiB10.3 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
/1c5c1ecf7303/be01910c327c/6c185aecd8cc/challenge.js501.2 KiB
m.media-amazon.com/images/I/71OG-v-v9TL._SX3000_.jpg221.5 KiB
www.amazon.es/147.6 KiB
/images/I/51jC0T3AfxL._RC|71ekcYa0U8L.js,416IQz5llzL.js,0...123.5 KiB
m.media-amazon.com/images/I/61wa8S0iPwL._SX3000_.jpg118.2 KiB
m.media-amazon.com/images/I/61I3L2x2K3L._SX1500_.jpg77.1 KiB
m.media-amazon.com/images/I/61pDy+u03XL._SX1500_.jpg75.5 KiB
/images/I/11I0WXrZVoL._RC|11Y+5x+kkTL.js,518IfuPC2lL.js,1...69.5 KiB
m.media-amazon.com/images/I/51u8BDoFEyL._SX3000_.jpg63.6 KiB
m.media-amazon.com/images/I/515ad--yH0L._SX3000_.jpg61.4 KiB

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 589 ms
URLTime Spent
amazon.es/317 ms
www.amazon.es/273 ms
www.amazon.es/0.0 ms
●Time to Interactive 2.1 s
●Max Potential First Input Delay 110 ms
●Layout shift culprits
●Document request latency
●Optimize DOM size
●Forced reflow
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Minify CSS
●JavaScript execution time 0.6 s
●Minimizes main-thread work 1.3 s
●Avoid long main-thread tasks 2 long tasks found
●Avoid non-composited animations 1 animated element found
●Image elements have explicit `width` and `height`
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 40 ms
●Server Backend Latencies 50 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 80 ms
●Avoid large layout shifts 1 layout shift found
○INP breakdown
○User Timing marks and measures
91

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

Each ARIA `role` supports a specific subset of `aria-*` attributes. Mismatching these invalidates the `aria-*` attributes. Learn how to match ARIA attributes to their roles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Search Amazon.es form#nav-search-bar-form > div.nav-fill > div.nav-search-field > input#twotabsearchtextbox

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.

Navigation

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Get to Know Us div.navFooterVerticalColumn > div.navFooterVerticalRow > div.navFooterLinkCol > div.navFooterColHead

These are opportunities to improve keyboard navigation in your application.

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
Expand to Change Language or Country div.nav-right > div#nav-tools > div#icp-nav-flyout > button.nav-flyout-button
Expand Account and Lists div.nav-right > div#nav-tools > div#nav-link-accountList > button.nav-flyout-button
Gift Cards Details ul.nav-ul > li.nav-li > div#nav_link_gift_cards > button.nav-flyout-button

These items highlight common accessibility best practices.

Visible text labels that do not match the accessible name can result in a confusing experience for screen reader users. Learn more about accessible names.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
EN div.nav-right > div#nav-tools > div#icp-nav-flyout > a.nav-a
Kindle eBooks div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Audiobooks div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Literary awards div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Best-sellers div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Hammocks div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Sprinklers div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Garden hoses div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Sun loungers div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Men’s watches div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Women’s watches div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Women’s jewellery div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Suitcases div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Beauty div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Staples div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
New in div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Trending div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Power strips div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Drill drivers div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Thermostats div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Batteries div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Connection bases div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Headphones div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Car stereos div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Tablets div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
HDMI cables div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Karaoke equipment div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Batteries div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Floorstanding speakers div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
PC games div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Nintendo Switch div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Racing wheels div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
PlayStation 5 div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Food processors div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Jug blenders div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Vacuum cleaners div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Humidifiers div._Zmx1a_fluidQuadImageLabelBody_3tld0 > div.a-section > div.a-section > a.a-link-normal
Computer Computer div#CardInstanceKr3ZPdcKmbIRpMchqitBKg > div.a-cardui-body > div.a-section > a.a-link-normal
Office Office div.a-cardui-body > div.a-section > div.a-section > a.a-link-normal
Home Home div.a-cardui-body > div.a-section > div.a-section > a.a-link-normal
Cameras Cameras div.a-cardui-body > div.a-section > div.a-section > a.a-link-normal
○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>`
●`[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
●Image elements have `[alt]` attributes
●Input buttons have discernible text.
●Form elements have associated labels
●Select elements have associated label elements.
●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 are distinguishable without relying on color.
●Links have a discernible name
●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
●`[lang]` attributes have a valid value
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Uses ARIA roles only on compatible elements
●Image elements do not have `[alt]` attributes that are redundant text.
●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
○`<frame>` or `<iframe>` elements have a title
○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
○`<input type="image">` elements have `[alt]` text
○The document does not use `<meta http-equiv="refresh">`
○`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
○`<object>` elements have alternate text
○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.
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○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.
81

Best Practices

General

Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / WarningSource
SharedStorage
www.amazon.es/ line 3447, col 2048
●Uses HTTPS
●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
●Ensure proper origin isolation with COOP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
○Use a strong HSTS policy
○Mitigate clickjacking with XFO or CSP
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
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`

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