C — https://prometheus.io | BeaverCheck Audit

Site Health

Score: 79 / 100

Based on 8 categories, 0 sections

How is this calculated?

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

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

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

Top Priorities (5)

Content-Security-Policy header is missing

Security › Security Headers

No Content-Security-Policy header found

Security › Content Security Policy

2 button(s) with no accessible text

Accessibility › Link & Button Quality

Cross-Origin-Embedder-Policy header is missing

Security › Security Headers

Cross-Origin-Opener-Policy header is missing

Security › Security Headers

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[![BeaverCheck](https://beavercheck.com/badge?url=https%3A%2F%2Fprometheus.io)](https://beavercheck.com/results/bdbd8334-e068-f52d-33dc-1d163f83b45b)

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Lighthouse Scores

Industry-standard audits powered by Google Lighthouse.

Performance

Accessibility

100

Best Practices

100

SEO

Core Web Vitals

Key metrics that affect user experience.

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

1.74 s

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

3.01 s

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

802 ms

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

0.000

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

1.74 s

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

7.67 s

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

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

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

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

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

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

items: [map[reflowTime:37.574 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.

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.

URL	Transfer Size	Duration
prometheus.io/_next/static/css/b3f783ba16bcc241.css	1.3 KiB	482 ms
prometheus.io/_next/static/css/12996fad8d583efc.css	27.0 KiB	798 ms
prometheus.io/_next/static/css/0566b04bc4104246.css	2.5 KiB	165 ms
prometheus.io/_next/static/css/afedc5bb723d1741.css	2.0 KiB	482 ms

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

Request	Cache TTL	Transfer Size
www.google-analytics.com/analytics.js	7200.0 s	20.8 KiB
/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312...	86400.0 s	10.7 KiB

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

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

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

TTI

Diagnostics

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

URL	Total CPU Time	Script Evaluation	Script Parse
prometheus.io/_next/static/chunks/255-0edcbb5b637cbfcb.js	439 ms	406 ms	21 ms
prometheus.io/	408 ms	28 ms	20 ms
prometheus.io/_next/static/chunks/341-0544a5ed99d6b02e.js	373 ms	311 ms	61 ms
www.googletagmanager.com/gtag/js?id=G-80ZM8LGB96	328 ms	269 ms	56 ms
Unattributable	256 ms	36 ms	0.0 ms
prometheus.io/_next/static/chunks/4bd1b696-409494caf8c83275.js	171 ms	152 ms	18 ms
www.googletagmanager.com/gtag/js?id=UA-58468480-1&cx=c&gtm=4e6460	158 ms	115 ms	41 ms
prometheus.io/_next/static/chunks/app/docs/layout-93dabed0bf180654.js	92 ms	65 ms	26 ms
prometheus.io/_next/static/chunks/app/download/page-96109228bfdc297b.js	59 ms	43 ms	16 ms
www.google-analytics.com/analytics.js	51 ms	43 ms	7.1 ms

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

Category	Time Spent
Script Evaluation	1.6 s
Script Parsing & Compilation	303 ms
Other	296 ms
Style & Layout	282 ms
Parse HTML & CSS	47 ms
Rendering	19 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.

Estimated savings: 0.0 ms 213.3 KiB

URL	Transfer Size	Est Savings
prometheus.io/_next/static/chunks/341-0544a5ed99d6b02e.js	141.5 KiB	86.9 KiB
www.googletagmanager.com/gtag/js?id=UA-58468480-1&cx=c&gtm=4e6460	114.7 KiB	64.9 KiB
www.googletagmanager.com/gtag/js?id=G-80ZM8LGB96	152.2 KiB	61.5 KiB

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

●Improve image delivery

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●Reduce unused CSS

●Avoids enormous network payloads Total size was 824 KiB

●User Timing marks and measures 6 user timings

●Avoid long main-thread tasks 12 long tasks found

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

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 10 ms

●Server Backend Latencies 160 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 30 ms

○INP breakdown

○LCP request discovery

○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.

Names and labels

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

Failing Elements
div.m_7485cace > div.Header_inner__ggL_E > div.m_4081bf90 > button#mantine-fdqpb6lm5-target `div.m_7485cace > div.Header_inner__ggL_E > div.m_4081bf90 > button#mantine-fdqpb6lm5-target`

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Contrast

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

Failing Elements
Prometheus User Survey (Edition 03.2026) `div.mantine-hidden-from-sm > span > a.mantine-focus-auto > span`
Monitor your applications, systems, and services with the leading open source m… `div.m_7485cace > div.Hero_wrapper__PHxif > div.Hero_inner__M_C9y > p.mantine-focus-auto`
Get started `div.Hero_buttons__KNKv_ > a.mantine-focus-auto > span.m_80f1301b > span.m_811560b9`
Prometheus models time series in a flexible dimensional data model. Time series… `div.m_7485cace > div.m_2415a157 > a.FeaturesCards_card__6UuI0 > p.mantine-focus-auto`
The PromQL query language allows you to query, correlate, and transform your ti… `div.m_7485cace > div.m_2415a157 > a.FeaturesCards_card__6UuI0 > p.mantine-focus-auto`
Alerting rules are based on PromQL and make full use of the dimensional data mo… `div.m_7485cace > div.m_2415a157 > a.FeaturesCards_card__6UuI0 > p.mantine-focus-auto`
Prometheus servers operate independently and only rely on local storage. Develo… `div.m_7485cace > div.m_2415a157 > a.FeaturesCards_card__6UuI0 > p.mantine-focus-auto`
Prometheus provides a large number of official and community-contributed metric… `div.m_7485cace > div.m_2415a157 > a.FeaturesCards_card__6UuI0 > p.mantine-focus-auto`
Prometheus comes with hundreds of official and community-contributed integratio… `div.m_7485cace > div.m_2415a157 > a.FeaturesCards_card__6UuI0 > p.mantine-focus-auto`
MODERN MONITORING `div.m_7485cace > div.m_4081bf90 > div.m_347db0ec > span.m_5add502a`
Designed for the cloud native world, Prometheus integrates with Kubernetes and … `div.m_89ab340 > main.m_8983817 > div.m_7485cace > p.mantine-focus-auto`
Site Reliability Engineering: How Google Runs Production Systems (O'Reilly Medi… `main.m_8983817 > div.m_7485cace > blockquote.m_ddec01c0 > cite.m_dde51a35`
Prometheus is 100% open source and community-driven. All components are availab… `main.m_8983817 > div.m_7485cace > div.FeaturesCards_description__Nd9a8 > p.mantine-focus-auto`
Apache 2 License `div.m_7485cace > div.FeaturesCards_description__Nd9a8 > p.mantine-focus-auto > a.mantine-focus-auto`
GitHub `div.m_7485cace > div.FeaturesCards_description__Nd9a8 > p.mantine-focus-auto > a.mantine-focus-auto`
Star us on GitHub `div.m_6d731127 > a.mantine-focus-auto > span.m_80f1301b > span.m_811560b9`
Prometheus is a Cloud Native Computing Foundation graduated project. `main.m_8983817 > div.m_7485cace > div.FeaturesCards_description__Nd9a8 > p.mantine-focus-auto`
Cloud Native Computing Foundation `div.m_7485cace > div.FeaturesCards_description__Nd9a8 > p.mantine-focus-auto > a.mantine-focus-auto`
© Prometheus Authors 2014-2026 \| Documentation Distributed under CC-BY-4.0 `footer > div.m_7485cace > div.m_4081bf90 > p.mantine-focus-auto`
© 2026 The Linux Foundation. All rights reserved. The Linux Foundation has regi… `footer > div.m_7485cace > div.m_4081bf90 > p.mantine-focus-auto`
Trademark Usage `div.m_7485cace > div.m_4081bf90 > p.mantine-focus-auto > a.mantine-focus-auto`

Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.

Failing Elements
Apache 2 License `div.m_7485cace > div.FeaturesCards_description__Nd9a8 > p.mantine-focus-auto > a.mantine-focus-auto`
GitHub `div.m_7485cace > div.FeaturesCards_description__Nd9a8 > p.mantine-focus-auto > a.mantine-focus-auto`
Cloud Native Computing Foundation `div.m_7485cace > div.FeaturesCards_description__Nd9a8 > p.mantine-focus-auto > a.mantine-focus-auto`
Trademark Usage `div.m_7485cace > div.m_4081bf90 > p.mantine-focus-auto > a.mantine-focus-auto`

These are opportunities to improve the legibility of your content.

○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

●Image elements have `[alt]` attributes

●`[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

●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

○`[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

○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.

○Uses ARIA roles only on compatible elements

○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.

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.

URL
prometheus.io/_next/static/chunks/341-0544a5ed99d6b02e.js

●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

○Redirects HTTP traffic to HTTPS

○Detected JavaScript libraries

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`

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse. — Desktop

100

Performance

Accessibility

100

Best Practices

100

SEO

Core Web Vitals

Key metrics that affect user experience. — Desktop

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

489 ms

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

773 ms

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

25 ms

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

0.000

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

489 ms

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

1.32 s

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.

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

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

items: [map[reflowTime:62.357 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.

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.

URL	Transfer Size	Duration
prometheus.io/_next/static/css/12996fad8d583efc.css	27.0 KiB	205 ms
prometheus.io/_next/static/css/afedc5bb723d1741.css	2.0 KiB	156 ms
prometheus.io/_next/static/css/b3f783ba16bcc241.css	1.3 KiB	156 ms
prometheus.io/_next/static/css/0566b04bc4104246.css	2.5 KiB	59 ms

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

Request	Cache TTL	Transfer Size
www.google-analytics.com/analytics.js	7200.0 s	20.8 KiB
/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312...	86400.0 s	10.7 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.

Estimated savings: 0.0 ms 213.7 KiB

URL	Transfer Size	Est Savings
prometheus.io/_next/static/chunks/341-0544a5ed99d6b02e.js	141.5 KiB	86.9 KiB
www.googletagmanager.com/gtag/js?id=UA-58468480-1&cx=c&gtm=4e6460	114.7 KiB	64.9 KiB
www.googletagmanager.com/gtag/js?id=G-80ZM8LGB96	152.2 KiB	61.8 KiB

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

●Max Potential First Input Delay 100 ms

●Layout shift culprits

●Document request latency

●Optimize DOM size

●Font display

●Improve image delivery

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Time to Interactive 1.3 s

●Minify CSS

●Minify JavaScript

●Reduce unused CSS

●Avoids enormous network payloads Total size was 995 KiB

●User Timing marks and measures 6 user timings

●JavaScript execution time 0.3 s

●Minimizes main-thread work 0.7 s

●Avoid long main-thread tasks 1 long task found

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

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 10 ms

●Server Backend Latencies 100 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 20 ms

○INP breakdown

○LCP request discovery

○Avoid non-composited animations

○Avoid large layout shifts

Accessibility

Contrast

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

Failing Elements
Take the Prometheus User Survey (Edition 03.2026) and help the community prior… `div > div.m_4081bf90 > div.mantine-visible-from-sm > span`
Prometheus User Survey (Edition 03.2026) `div.mantine-visible-from-sm > span > a.mantine-focus-auto > span`
Ctrl + K `div.m_46b77525 > div.m_6c018570 > div.m_82577fc2 > p.mantine-focus-auto`
Monitor your applications, systems, and services with the leading open source m… `div.m_7485cace > div.Hero_wrapper__PHxif > div.Hero_inner__M_C9y > p.mantine-focus-auto`
Get started `div.Hero_buttons__KNKv_ > a.mantine-focus-auto > span.m_80f1301b > span.m_811560b9`
Prometheus models time series in a flexible dimensional data model. Time series… `div.m_7485cace > div.m_2415a157 > a.FeaturesCards_card__6UuI0 > p.mantine-focus-auto`
The PromQL query language allows you to query, correlate, and transform your ti… `div.m_7485cace > div.m_2415a157 > a.FeaturesCards_card__6UuI0 > p.mantine-focus-auto`
Alerting rules are based on PromQL and make full use of the dimensional data mo… `div.m_7485cace > div.m_2415a157 > a.FeaturesCards_card__6UuI0 > p.mantine-focus-auto`
Prometheus servers operate independently and only rely on local storage. Develo… `div.m_7485cace > div.m_2415a157 > a.FeaturesCards_card__6UuI0 > p.mantine-focus-auto`
Prometheus provides a large number of official and community-contributed metric… `div.m_7485cace > div.m_2415a157 > a.FeaturesCards_card__6UuI0 > p.mantine-focus-auto`
Prometheus comes with hundreds of official and community-contributed integratio… `div.m_7485cace > div.m_2415a157 > a.FeaturesCards_card__6UuI0 > p.mantine-focus-auto`
MODERN MONITORING `div.m_7485cace > div.m_4081bf90 > div.m_347db0ec > span.m_5add502a`
Designed for the cloud native world, Prometheus integrates with Kubernetes and … `div.m_89ab340 > main.m_8983817 > div.m_7485cace > p.mantine-focus-auto`
Site Reliability Engineering: How Google Runs Production Systems (O'Reilly Medi… `main.m_8983817 > div.m_7485cace > blockquote.m_ddec01c0 > cite.m_dde51a35`
Prometheus is 100% open source and community-driven. All components are availab… `main.m_8983817 > div.m_7485cace > div.FeaturesCards_description__Nd9a8 > p.mantine-focus-auto`
Apache 2 License `div.m_7485cace > div.FeaturesCards_description__Nd9a8 > p.mantine-focus-auto > a.mantine-focus-auto`
GitHub `div.m_7485cace > div.FeaturesCards_description__Nd9a8 > p.mantine-focus-auto > a.mantine-focus-auto`
Star us on GitHub `div.m_6d731127 > a.mantine-focus-auto > span.m_80f1301b > span.m_811560b9`
Prometheus is a Cloud Native Computing Foundation graduated project. `main.m_8983817 > div.m_7485cace > div.FeaturesCards_description__Nd9a8 > p.mantine-focus-auto`
Cloud Native Computing Foundation `div.m_7485cace > div.FeaturesCards_description__Nd9a8 > p.mantine-focus-auto > a.mantine-focus-auto`
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Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.

Failing Elements
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These are opportunities to improve the legibility of your content.

○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

●Image elements have `[alt]` attributes

●Form elements have associated labels

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

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

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

●Elements use only permitted ARIA attributes

●Document has a `<title>` element

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

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

●Links 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

○`[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

○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.

○Uses ARIA roles only on compatible elements

○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.

100

Best Practices

General

URL
prometheus.io/_next/static/chunks/341-0544a5ed99d6b02e.js

●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

○Redirects HTTP traffic to HTTPS

○Detected JavaScript libraries

100

SEO

○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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Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

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