Lighthouse Desktop

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

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Detailed Report

Audit breakdown by category with detailed findings.

100

Performance

Insights

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Protocol
ziglang.org/	http/1.1
ziglang.org/css/style.css	http/1.1
ziglang.org/css/navigation.css	http/1.1
ziglang.org/css/home.css	http/1.1
ziglang.org/ziggy.svg	http/1.1
ziglang.org/zero.svg	http/1.1
ziglang.org/sponsors/tb-logo-black.png	http/1.1
ziglang.org/sponsors/Blacksmith_Logo-Black.svg	http/1.1
ziglang.org/sponsors/zml.svg	http/1.1
ziglang.org/sponsors/SILARES_HORIZONTAL_LOGO_BLACK.png	http/1.1
ziglang.org/zig-logo-dark.svg	http/1.1
ziglang.org/external-link-dark.svg	http/1.1
ziglang.org/favicon.svg	http/1.1
ziglang.org/favicon.png	http/1.1

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.

title: Preconnected origins

value: no origins were preconnected

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

value: No additional origins are good candidates for preconnecting

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
ziglang.org/css/home.css	1.6 KiB	126 ms
ziglang.org/css/style.css	2.6 KiB
ziglang.org/css/navigation.css	765 B	126 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.

Request	Cache TTL	Transfer Size
ziglang.org/zero.svg	0.0 ms	240.5 KiB
ziglang.org/sponsors/SILARES_HORIZONTAL_LOGO_BLACK.png	0.0 ms	128.8 KiB
ziglang.org/ziggy.svg	0.0 ms	21.7 KiB
ziglang.org/sponsors/tb-logo-black.png	0.0 ms	11.1 KiB
ziglang.org/sponsors/Blacksmith_Logo-Black.svg	0.0 ms	7.6 KiB
ziglang.org/sponsors/zml.svg	0.0 ms	3.2 KiB
ziglang.org/css/style.css	0.0 ms	2.6 KiB
ziglang.org/zig-logo-dark.svg	0.0 ms	1.8 KiB
ziglang.org/css/home.css	0.0 ms	1.6 KiB
ziglang.org/external-link-dark.svg	0.0 ms	1.2 KiB
ziglang.org/css/navigation.css	0.0 ms	765 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.

	URL	Resource Size	Est Savings
div.monetary-logos > a.span2 > picture > img `div.monetary-logos > a.span2 > picture > img`	ziglang.org/sponsors/SILARES_HORIZONTAL_LOGO_BLACK.png	128.5 KiB	127.5 KiB

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

Diagnostics

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.monetary-logos > a.span2 > picture > img `div.monetary-logos > a.span2 > picture > img`	ziglang.org/sponsors/SILARES_HORIZONTAL_LOGO_BLACK.png
div.monetary-logos > a.span2 > picture#zml > img `div.monetary-logos > a.span2 > picture#zml > img`	ziglang.org/sponsors/zml.svg
div.monetary-logos > a.span2 > picture > img `div.monetary-logos > a.span2 > picture > img`	ziglang.org/sponsors/tb-logo-black.png
div.monetary-logos > a.span2 > picture > img `div.monetary-logos > a.span2 > picture > img`	ziglang.org/sponsors/Blacksmith_Logo-Black.svg
div.container > div.container > div > img `div.container > div.container > div > img`	ziglang.org/ziggy.svg
div.container > div.container > div > img `div.container > div.container > div > img`	ziglang.org/zero.svg

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

●Layout shift culprits

●Document request latency

●Optimize DOM size

●Font display

●Forced reflow

●LCP breakdown

●Optimize viewport for mobile

●Time to Interactive 0.3 s

●Max Potential First Input Delay 20 ms

●Minify CSS

●Minify JavaScript

●Reduce unused CSS

●Reduce unused JavaScript

●Avoids enormous network payloads Total size was 427 KiB

●JavaScript execution time 0.0 s

●Minimizes main-thread work 0.1 s

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 90 ms

●Server Backend Latencies 10 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 100 ms

○INP breakdown

○LCP request discovery

○User Timing marks and measures

○Avoid long main-thread tasks

○Avoid non-composited animations

○Avoid large layout shifts

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

Contrast

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
@import `figure > pre > code > span.tok-builtin`
// Ensure the list is freed at scope exit. `figure > pre > code > span.tok-comment`
// Try commenting out this line! `figure > pre > code > span.tok-comment`
10 `figure > pre > code > span.tok-number`
123 `figure > pre > code > span.tok-number`
67 `figure > pre > code > span.tok-number`
89 `figure > pre > code > span.tok-number`
99 `figure > pre > code > span.tok-number`

These are opportunities to improve the legibility of your content.

Names and labels

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.container > div.container > div > img `div.container > div.container > div > img`
div.container > div.container > div > img `div.container > div.container > div > 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
body > div.container > a `body > div.container > a`
div.alt-background > div.container > div.monetary-logos > a.span2 `div.alt-background > div.container > div.monetary-logos > a.span2`
div.alt-background > div.container > div.monetary-logos > a.span2 `div.alt-background > div.container > div.monetary-logos > a.span2`
div.alt-background > div.container > div.monetary-logos > a.span2 `div.alt-background > div.container > div.monetary-logos > a.span2`
div.alt-background > div.container > div.monetary-logos > a.span2 `div.alt-background > div.container > div.monetary-logos > a.span2`

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.

○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

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

●Document has a `<title>` element

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

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

●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

●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

●Identical links have the same purpose.

○`[accesskey]` values are unique

○`[aria-*]` attributes match their roles

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

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

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

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

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements use only permitted ARIA attributes

○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

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

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

○Buttons have an accessible name

○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

○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.

○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 clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Detected JavaScript libraries

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Content Best Practices

Meta descriptions may be included in search results to concisely summarize page content. Learn more about the meta description.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Descriptive link text helps search engines understand your content. Learn how to make links more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Link destination	Link Text
ziglang.org/zsf/	Learn More

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.container > div.container > div > img `div.container > div.container > div > img`
div.container > div.container > div > img `div.container > div.container > div > img`

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Page has successful HTTP status code

●Links are crawlable

●Document has a valid `hreflang`

○robots.txt is valid

○Document has a valid `rel=canonical`