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Lighthouse Mobile
· 0 checks — Mobile Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.SCORE
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GRADE
FIX
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REVIEW
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PASS
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INFO
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Detailed Report
Audit breakdown by category with detailed findings.
58
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.
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:51.173 source:map[column:22410 line:4 type:source-location url:https://assets.dev.to/assets/base-0c748bbcdc30041261c326ef2ce931fbce46c58bc3c488da881ae35c4750941d.js urlProvider:network]] map[reflowTime:0.837 source:map[column:10822 line:0 type:source-location url:https://assets.dev.to/assets/base-0c748bbcdc30041261c326ef2ce931fbce46c58bc3c488da881ae35c4750941d.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
Why this matters
Performance issues directly impact user engagement and conversion rates.
| URL | Resource Size | Est Savings | |
|---|---|---|---|
Cover image for Join our April Fools Challenge for a chance at TEA-RRIFIC prize… div.crayons-story > div.crayons-article__cover > a.crayons-article__cover__image__feed > img.crayons-article__cover__image__feed | /dynamic/image/width=1000,height=420,fit=cover,gravity=au... | 107.6 KiB | 72.1 KiB |
a.ltag__link__link > div.ltag__link__org__pic > div.ltag__link__user__pic > img a.ltag__link__link > div.ltag__link__org__pic > div.ltag__link__user__pic > img | /dynamic/image/width=775,height=,fit=scale-down,gravity=a... | 28.8 KiB | 28.7 KiB |
The DEV Team div.ltag__link > a.ltag__link__link > div.ltag__link__org__pic > img | /dynamic/image/width=775,height=,fit=scale-down,gravity=a... | 10.9 KiB | 10.8 KiB |
build apps with google ai div.text-styles > p > a > img | /dynamic/image/width=775,height=,fit=scale-down,gravity=a... | 31.7 KiB | 9.6 KiB |
varshithvhegde profile div.crayons-story__meta > div.crayons-story__author-pic > a.crayons-avatar > img.crayons-avatar__image | /dynamic/image/width=90,height=90,fit=cover,gravity=auto,... | 6.9 KiB | 6.4 KiB |
johnson998877 profile div.crayons-story__meta > div.crayons-story__author-pic > a.crayons-avatar > img.crayons-avatar__image | /dynamic/image/width=90,height=90,fit=cover,gravity=auto,... | 6.8 KiB | 6.3 KiB |
sami-openlife profile div.crayons-story__meta > div.crayons-story__author-pic > a.crayons-avatar > img.crayons-avatar__image | /dynamic/image/width=90,height=90,fit=cover,gravity=auto,... | 6.5 KiB | 6.0 KiB |
greysquirr3l profile div.crayons-story__meta > div.crayons-story__author-pic > a.crayons-avatar > img.crayons-avatar__image | /dynamic/image/width=90,height=90,fit=cover,gravity=auto,... | 6.3 KiB | 5.8 KiB |
jess profile div.crayons-story__meta > div.crayons-story__author-pic > a.crayons-avatar > img.crayons-avatar__image | /dynamic/image/width=90,height=90,fit=cover,gravity=auto,... | 5.7 KiB | 5.2 KiB |
xbill profile div.crayons-story__meta > div.crayons-story__author-pic > a.crayons-avatar > img.crayons-avatar__image | /dynamic/image/width=90,height=90,fit=cover,gravity=auto,... | 5.1 KiB | 4.9 KiB |
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: Cover image for Join our April Fools Challenge for a chance at TEA-RRIFIC prize…
path: 1,HTML,1,BODY,10,DIV,0,DIV,2,DIV,2,MAIN,3,DIV,2,DIV,0,A,0,IMG
selector: div.crayons-story > div.crayons-article__cover > a.crayons-article__cover__image__feed > img.crayons-article__cover__image__feed
snippet: <img src="https://media2.dev.to/dynamic/image/width=1000,height=420,fit=cover,gravit…" width="1000" height="420" style="background-color:#dddddd;" class="crayons-article__cover__image__feed" alt="Cover image for Join our April Fools Challenge for a chance at TEA-RRIFIC …">
Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size |
|---|---|
| /assets/react-dates/lib/css/_datepicker-efc367057e7f65b77... | 4.4 KiB |
These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.
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
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: 450 ms 96.3 KiB
| URL | Transfer Size | Est Savings |
|---|---|---|
| /assets/crayons-fc4007c03f7f0a84c66245b6a49428b9f46dd67aa... | 49.4 KiB | 43.8 KiB |
| /assets/minimal-9fca31589c6f9b95947a548417b1060765ec46fb3... | 41.4 KiB | 39.1 KiB |
| /assets/views-6ed385fd9c495c89efa772dee4faa01ec0ffb94fd78... | 14.5 KiB | 13.4 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.
Why this matters
Performance issues directly impact user engagement and conversion rates.
Estimated savings: 2.2 s 406.9 KiB
| URL | Transfer Size | Est Savings |
|---|---|---|
| /assets/application-0b268684912bef9b0f23defff01cb608bfc5d... | 190.1 KiB | 185.7 KiB |
| /assets/homePage-fd5d5a8d3dabded9230df005c7df04e1ea5e6dd7... | 167.9 KiB | 123.9 KiB |
| www.googletagmanager.com/gtag/js?id=G-TYEM8Y3JN3 | 150.6 KiB | 62.7 KiB |
| /assets/base-0c748bbcdc30041261c326ef2ce931fbce46c58bc3c4... | 48.5 KiB | 34.6 KiB |
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.
| Category | Time Spent |
|---|---|
| Script Evaluation | 728 ms |
| Other | 523 ms |
| Style & Layout | 412 ms |
| Script Parsing & Compilation | 296 ms |
| Parse HTML & CSS | 134 ms |
| Rendering | 112 ms |
More information about the performance of your application. These numbers don't directly affect the Performance score.
●Use efficient cache lifetimes
●Layout shift culprits
●Document request latency
●Optimize DOM size
●Font display
●LCP breakdown
●Modern HTTP
●Network dependency tree
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●Avoids enormous network payloads Total size was 1,112 KiB
●User Timing marks and measures 5 user timings
●JavaScript execution time 0.8 s
●Avoid long main-thread tasks 9 long tasks found
●Image elements have explicit `width` and `height`
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 0 ms
●Server Backend Latencies 630 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Avoid multiple page redirects
●Initial server response time was short Root document took 0 ms
○INP breakdown
○Avoid non-composited animations
○Avoid large layout shifts
80
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
Assistive technologies, like screen readers, can't interpret ARIA attributes with invalid values. Learn more about valid values for ARIA attributes.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.crayons-story > div.crayons-story__body > div.crayons-story__top > button#sponsorship-close-trigger-238627 div.crayons-story > div.crayons-story__body > div.crayons-story__top > button#sponsorship-close-trigger-238627 |
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 |
|---|
Learn at your own pace, and earn a badge upon completion. Easy! div.crayons-story__body > div.crayons-story__indention-billboard > div.text-styles > h4 |
These are opportunities to improve keyboard navigation in your application.
Names and labels
Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.crayons-story__indention-billboard > div.text-styles > h4 > a div.crayons-story__indention-billboard > div.text-styles > h4 > a |
These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.
Best practices
Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
The DEV Team logo div.crayons-story__top > div.crayons-story__meta > div.crayons-story__author-pic > a.crayons-logo |
Jess Lee div.crayons-story__meta > div > div > a.crayons-story__secondary |
Apr 1 div.crayons-story__top > div.crayons-story__meta > div > a.crayons-story__tertiary |
Jess Lee div.crayons-story__meta > div > div > a.crayons-story__secondary |
Mar 31 div.crayons-story__top > div.crayons-story__meta > div > a.crayons-story__tertiary |
Apr 1 div.crayons-story__top > div.crayons-story__meta > div > a.crayons-story__tertiary |
Apr 2 div.crayons-story__top > div.crayons-story__meta > div > a.crayons-story__tertiary |
Johnson div.crayons-story__meta > div > div > a.crayons-story__secondary |
Apr 4 div.crayons-story__top > div.crayons-story__meta > div > a.crayons-story__tertiary |
Apr 4 div.crayons-story__top > div.crayons-story__meta > div > a.crayons-story__tertiary |
fmerian div.crayons-story__meta > div > div > a.crayons-story__secondary |
Apr 3 div.crayons-story__top > div.crayons-story__meta > div > a.crayons-story__tertiary |
Apr 1 div.crayons-story__top > div.crayons-story__meta > div > a.crayons-story__tertiary |
경규찬 div.crayons-story__meta > div > div > a.crayons-story__secondary |
Apr 4 div.crayons-story__top > div.crayons-story__meta > div > a.crayons-story__tertiary |
Apr 3 div.crayons-story__top > div.crayons-story__meta > div > a.crayons-story__tertiary |
Google Developer Experts logo div.crayons-story__top > div.crayons-story__meta > div.crayons-story__author-pic > a.crayons-logo |
xbill div.crayons-story__meta > div > div > a.crayons-story__secondary |
Apr 3 div.crayons-story__top > div.crayons-story__meta > div > a.crayons-story__tertiary |
Google Developer Experts logo div.crayons-story__top > div.crayons-story__meta > div.crayons-story__author-pic > a.crayons-logo |
xbill div.crayons-story__meta > div > div > a.crayons-story__secondary |
Apr 3 div.crayons-story__top > div.crayons-story__meta > div > a.crayons-story__tertiary |
M Media div.crayons-story__meta > div > div > a.crayons-story__secondary |
Apr 3 div.crayons-story__top > div.crayons-story__meta > div > a.crayons-story__tertiary |
WiScale logo div.crayons-story__top > div.crayons-story__meta > div.crayons-story__author-pic > a.crayons-logo |
Julien L div.crayons-story__meta > div > div > a.crayons-story__secondary |
Apr 4 div.crayons-story__top > div.crayons-story__meta > div > a.crayons-story__tertiary |
Apr 3 div.crayons-story__top > div.crayons-story__meta > div > a.crayons-story__tertiary |
Apr 3 div.crayons-story__top > div.crayons-story__meta > div > a.crayons-story__tertiary |
Apr 4 div.crayons-story__top > div.crayons-story__meta > div > a.crayons-story__tertiary |
vitoriazzp div.crayons-story__meta > div > div > a.crayons-story__secondary |
Apr 3 div.crayons-story__top > div.crayons-story__meta > div > a.crayons-story__tertiary |
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 |
|---|
288 div.crayons-story__indention > div.crayons-story__bottom > div.crayons-story__details > a.crayons-btn |
72 div.crayons-story__indention > div.crayons-story__bottom > div.crayons-story__details > a.crayons-btn |
90 div.crayons-story__indention > div.crayons-story__bottom > div.crayons-story__details > a.crayons-btn |
25 div.crayons-story__indention > div.crayons-story__bottom > div.crayons-story__details > a.crayons-btn |
160 div.crayons-story__indention > div.crayons-story__bottom > div.crayons-story__details > a.crayons-btn |
52 div.crayons-story__indention > div.crayons-story__bottom > div.crayons-story__details > a.crayons-btn |
119 div.crayons-story__indention > div.crayons-story__bottom > div.crayons-story__details > a.crayons-btn |
56 div.crayons-story__indention > div.crayons-story__bottom > div.crayons-story__details > a.crayons-btn |
1 div.crayons-story__indention > div.crayons-story__bottom > div.crayons-story__details > a.crayons-btn |
2 div.crayons-story__indention > div.crayons-story__bottom > div.crayons-story__details > a.crayons-btn |
1 div.crayons-story__indention > div.crayons-story__bottom > div.crayons-story__details > a.crayons-btn |
1 div.crayons-story__indention > div.crayons-story__bottom > div.crayons-story__details > a.crayons-btn |
81 div.crayons-story__indention > div.crayons-story__bottom > div.crayons-story__details > a.crayons-btn |
53 div.crayons-story__indention > div.crayons-story__bottom > div.crayons-story__details > a.crayons-btn |
3 div.crayons-story__indention > div.crayons-story__bottom > div.crayons-story__details > a.crayons-btn |
1 div.crayons-story__indention > div.crayons-story__bottom > div.crayons-story__details > a.crayons-btn |
2 div.crayons-story__indention > div.crayons-story__bottom > div.crayons-story__details > a.crayons-btn |
30 div.crayons-story__indention > div.crayons-story__bottom > div.crayons-story__details > a.crayons-btn |
○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 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
●`[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
●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
●Skip links are focusable.
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Identical links have the same purpose.
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○Elements with `role="dialog"` or `role="alertdialog"` 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 buttons have discernible text.
○`<input type="image">` elements have `[alt]` text
○Form elements have associated labels
○Links are distinguishable without relying on color.
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○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.
○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
General
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.
●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
●Detected JavaScript libraries
○Redirects HTTP traffic to HTTPS
○Mitigate clickjacking with XFO or CSP
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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.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img div.multiple_reactions_aggregate > span.multiple_reactions_icons_container > span.crayons_icon_container > img |
Format your HTML in a way that enables crawlers to better understand your app’s content.
○Structured data is valid
●Page isn’t blocked from indexing
●Document has a `<title>` element
●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`