C — https://rubyonrails.org | BeaverCheck Audit

Site Health

Score: 73 / 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

HSTS header is missing

Security › Security Headers

No Content-Security-Policy header found

Security › Content Security Policy

No <main> landmark found

Accessibility › Landmark Structure

Cross-Origin-Embedder-Policy header is missing

Security › Security Headers

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[![BeaverCheck](https://beavercheck.com/badge?url=https%3A%2F%2Frubyonrails.org)](https://beavercheck.com/results/11968659-fa93-4163-b5e2-f51bc406f68e)

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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.

966 ms

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

1.10 s

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

374 ms

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

0.215

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

998 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.

1.59 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.

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]

items: [map[node:map[type:text value:Total] score:0.214524] map[node:map[boundingRect:map[bottom:846 height:198 left:30 right:382 top:648 width:352] lhId:page-1-DIV nodeLabel:div.layout > div.video > div.container > div.video__embed path:1,HTML,1,BODY,2,DIV,1,DIV,0,DIV,0,DIV selector:div.layout > div.video > div.container > div.video__embed snippet:<div class="video__embed"> type:node] score:0.123265 subItems:map[items:[map[cause:Web font extra:map[type:url value:https://rubyonrails.org/assets/fonts/calibre-bold.woff2]] map[cause:Web font extra:map[type:url value:https://rubyonrails.org/assets/fonts/IBMPlexMono-Medium.woff2]]] type:subitems]] map[node:map[boundingRect:map[bottom:846 height:198 left:30 right:382 top:648 width:352] lhId:page-1-DIV nodeLabel:div.layout > div.video > div.container > div.video__embed path:1,HTML,1,BODY,2,DIV,1,DIV,0,DIV,0,DIV selector:div.layout > div.video > div.container > div.video__embed snippet:<div class="video__embed"> type:node] score:0.091259]]

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

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

Request	Cache TTL	Transfer Size
videos.37signals.com/rails/rails-8-demo.mp4	3600.0 s	1.1 MiB
videos.37signals.com/rails/rails-8-demo.webp	3600.0 s	420.1 KiB
rubyonrails.org/assets/fonts/IBMPlexMono-Medium.woff2	600.0 s	39.6 KiB
rubyonrails.org/assets/fonts/IBMPlexMono-Text.woff2	600.0 s	39.3 KiB
rubyonrails.org/assets/fonts/calibre-bold.woff2	600.0 s	26.8 KiB
rubyonrails.org/assets/fonts/calibre-semibold.woff2	600.0 s	26.1 KiB
rubyonrails.org/assets/fonts/calibre-regular.woff2	600.0 s	25.9 KiB
rubyonrails.org/assets/css/style.css	600.0 s	10.7 KiB
rubyonrails.org/assets/images/logo-soundcloud.svg	600.0 s	4.2 KiB
rubyonrails.org/assets/images/logo-airbnb.svg	600.0 s	4.0 KiB
rubyonrails.org/assets/images/logo-dribbble.svg	600.0 s	3.1 KiB
rubyonrails.org/assets/images/logo-shopify.svg	600.0 s	2.9 KiB
rubyonrails.org/assets/images/logo-hey.svg	600.0 s	2.6 KiB
rubyonrails.org/assets/images/logo-github.svg	600.0 s	2.6 KiB
rubyonrails.org/assets/images/logo-1password.svg	600.0 s	2.5 KiB
rubyonrails.org/assets/images/logo-intercom.svg	600.0 s	2.4 KiB
rubyonrails.org/assets/images/logo-basecamp.svg	600.0 s	2.2 KiB
rubyonrails.org/assets/images/logo-kickstarter.svg	600.0 s	2.2 KiB
rubyonrails.org/assets/images/logo-fleetio.svg	600.0 s	2.2 KiB
rubyonrails.org/assets/images/logo.svg	600.0 s	2.1 KiB
rubyonrails.org/assets/images/logo-coinbase.svg	600.0 s	2.0 KiB
rubyonrails.org/assets/images/logo-planetscale.svg	600.0 s	2.0 KiB
rubyonrails.org/assets/images/logo-lime.svg	600.0 s	2.0 KiB
rubyonrails.org/assets/images/logo-freeagent.svg	600.0 s	1.9 KiB
rubyonrails.org/assets/images/logo-cookpad.svg	600.0 s	1.8 KiB
rubyonrails.org/assets/images/logo-doximity.svg	600.0 s	1.7 KiB
rubyonrails.org/assets/images/logo-square.svg	600.0 s	1.7 KiB
rubyonrails.org/assets/images/logo-zendesk.svg	600.0 s	1.6 KiB
rubyonrails.org/assets/images/logo-instacart.svg	600.0 s	1.6 KiB
rubyonrails.org/assets/images/logo-gusto.svg	600.0 s	1.5 KiB
rubyonrails.org/assets/images/logo-heroku.svg	600.0 s	1.2 KiB
rubyonrails.org/assets/images/icon-button.svg	600.0 s	750 B
rubyonrails.org/assets/images/icon-card.svg	600.0 s	702 B
rubyonrails.org/assets/images/shape-top-up-left.svg	600.0 s	519 B
rubyonrails.org/assets/images/shape-top-down-left.svg	600.0 s	491 B
rubyonrails.org/assets/images/shape-bottom-up-left.svg	600.0 s	453 B
rubyonrails.org/assets/images/shape-top-down-right.svg	600.0 s	384 B
videos.37signals.com/rails/rails-8-demo.mp4	3600.0 s	0 B
videos.37signals.com/rails/rails-8-demo.mp4	3600.0 s	0 B

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

	URL	Resource Size	Est Savings
div.video > div.container > div.video__embed > video `div.video > div.container > div.video__embed > video`	videos.37signals.com/rails/rails-8-demo.webp	419.5 KiB	416.0 KiB

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

URL	Transfer Size	Duration
rubyonrails.org/assets/css/style.css	10.7 KiB	150 ms

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

These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS

Element	Layout shift score
div.layout > div.video > div.container > div.video__embed `div.layout > div.video > div.container > div.video__embed`	0.123
div.layout > div.video > div.container > div.video__embed `div.layout > div.video > div.container > div.video__embed`	0.091

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.

Diagnostics

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
Other	1.6 s
Style & Layout	519 ms
Rendering	325 ms
Script Evaluation	65 ms
Parse HTML & CSS	30 ms
Script Parsing & Compilation	1.4 ms

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

	URL
Basecamp `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-basecamp.svg
HEY `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-hey.svg
GitHub `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-github.svg
Shopify `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-shopify.svg
Instacart `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-instacart.svg
Dribbble `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-dribbble.svg
Gusto `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-gusto.svg
Zendesk `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-zendesk.svg
Airbnb `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-airbnb.svg
Square `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-square.svg
Kickstarter `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-kickstarter.svg
Heroku `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-heroku.svg
Coinbase `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-coinbase.svg
Soundcloud `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-soundcloud.svg
Cookpad `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-cookpad.svg
Doximity `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-doximity.svg
Intercom `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-intercom.svg
Fleetio `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-fleetio.svg
Lime `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-lime.svg
FreeAgent `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-freeagent.svg
1password `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-1password.svg
PlanetScale `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-planetscale.svg

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

●Document request latency

●Optimize DOM size

●Font display

●Forced reflow

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Time to Interactive 1.6 s

●Minify CSS

●Minify JavaScript

●Reduce unused CSS

●Reduce unused JavaScript

●Avoids enormous network payloads Total size was 1,823 KiB

●JavaScript execution time 0.1 s

●Avoid long main-thread tasks 4 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 0 ms

●Server Backend Latencies 150 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

○LCP request discovery

○User Timing marks and measures

○Avoid non-composited animations

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.

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.

Failing Elements
Ruby on Rails scales from PROMPT to IPO. Token-efficient code that's easy for a… `div.container > div.heading__body > div.heading__headline > h4`
Over the past two decades, Rails has taken countless companies to millions of u… `div.container > div.heading__body > div.heading__headline > h4`
Over six thousand people have contributed code to Rails, and many more have ser… `div.container > div.heading__body > div.heading__headline > h4`
Rails is a full-stack framework. It ships with all the tools needed to build am… `div.container > div.heading__body > div.heading__headline > h4`
app/models/article.rb `div.example__body > div.example__block > div.example__code > h6`
app/controllers/articles_controller.rb `div.example__body > div.example__block > div.example__code > h6`
app/views/articles/show.html.erb `div.example__body > div.example__block > div.example__code > h6`
config/routes.rb `div.example__body > div.example__block > div.example__code > h6`
LEARNING `a > div.card__body > div.card__label > h6`
CONTRIBUTING `a > div.card__body > div.card__label > h6`
KEEPING UP `a > div.card__body > div.card__label > h6`

These are opportunities to improve keyboard navigation in your application.

Best practices

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Failing Elements
html `html`

These items highlight common accessibility best practices.

○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

●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

●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

●Touch targets have sufficient size and spacing.

●Deprecated ARIA roles were not used

●Uses ARIA roles only on compatible elements

○`[accesskey]` values are unique

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

○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 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

○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

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○No element has a `[tabindex]` value greater than 0

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`[lang]` attributes have a valid value

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Image elements do not have `[alt]` attributes that are redundant text.

○Identical links have the same purpose.

○Elements with visible text labels have matching accessible names.

○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`<td>` elements in a large `<table>` have one or more table headers.

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

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

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.

250 ms

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

973 ms

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

82 ms

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

0.039

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

440 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.

975 ms

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.

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

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

Request	Cache TTL	Transfer Size
videos.37signals.com/rails/rails-8-demo.mp4	3600.0 s	2.0 MiB
videos.37signals.com/rails/rails-8-demo.webp	3600.0 s	420.2 KiB
rubyonrails.org/assets/fonts/IBMPlexMono-Medium.woff2	600.0 s	39.6 KiB
rubyonrails.org/assets/fonts/IBMPlexMono-Text.woff2	600.0 s	39.3 KiB
rubyonrails.org/assets/fonts/calibre-bold.woff2	600.0 s	26.8 KiB
rubyonrails.org/assets/fonts/calibre-regular.woff2	600.0 s	26.1 KiB
rubyonrails.org/assets/fonts/calibre-semibold.woff2	600.0 s	26.1 KiB
rubyonrails.org/assets/css/style.css	600.0 s	10.7 KiB
rubyonrails.org/assets/images/logo-soundcloud.svg	600.0 s	4.2 KiB
rubyonrails.org/assets/images/logo-airbnb.svg	600.0 s	4.0 KiB
rubyonrails.org/assets/images/logo-dribbble.svg	600.0 s	3.1 KiB
rubyonrails.org/assets/images/logo-shopify.svg	600.0 s	2.8 KiB
rubyonrails.org/assets/images/logo-hey.svg	600.0 s	2.6 KiB
rubyonrails.org/assets/images/logo-intercom.svg	600.0 s	2.5 KiB
rubyonrails.org/assets/images/logo-github.svg	600.0 s	2.5 KiB
rubyonrails.org/assets/images/logo-1password.svg	600.0 s	2.5 KiB
rubyonrails.org/assets/images/logo-kickstarter.svg	600.0 s	2.3 KiB
rubyonrails.org/assets/images/logo-fleetio.svg	600.0 s	2.2 KiB
rubyonrails.org/assets/images/logo.svg	600.0 s	2.1 KiB
rubyonrails.org/assets/images/logo-basecamp.svg	600.0 s	2.1 KiB
rubyonrails.org/assets/images/logo-lime.svg	600.0 s	2.0 KiB
rubyonrails.org/assets/images/logo-coinbase.svg	600.0 s	2.0 KiB
rubyonrails.org/assets/images/logo-planetscale.svg	600.0 s	2.0 KiB
rubyonrails.org/assets/images/logo-cookpad.svg	600.0 s	1.9 KiB
rubyonrails.org/assets/images/logo-freeagent.svg	600.0 s	1.9 KiB
rubyonrails.org/assets/images/logo-doximity.svg	600.0 s	1.7 KiB
rubyonrails.org/assets/images/logo-zendesk.svg	600.0 s	1.6 KiB
rubyonrails.org/assets/images/logo-square.svg	600.0 s	1.6 KiB
rubyonrails.org/assets/images/logo-instacart.svg	600.0 s	1.6 KiB
rubyonrails.org/assets/images/logo-gusto.svg	600.0 s	1.5 KiB
rubyonrails.org/assets/images/logo-heroku.svg	600.0 s	1.2 KiB
rubyonrails.org/assets/images/icon-button.svg	600.0 s	849 B
rubyonrails.org/assets/images/icon-card.svg	600.0 s	823 B
rubyonrails.org/assets/images/shape-top-down-left.svg	600.0 s	455 B
rubyonrails.org/assets/images/shape-bottom-up-left.svg	600.0 s	418 B
rubyonrails.org/assets/images/shape-top-down-right.svg	600.0 s	418 B
rubyonrails.org/assets/images/shape-top-up-left.svg	600.0 s	412 B
videos.37signals.com/rails/rails-8-demo.mp4	3600.0 s	0 B

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

	URL	Resource Size	Est Savings
div.video > div.container > div.video__embed > video `div.video > div.container > div.video__embed > video`	videos.37signals.com/rails/rails-8-demo.webp	419.5 KiB	381.2 KiB

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

lhId: page-0-VIDEO

nodeLabel: div.video > div.container > div.video__embed > video

path: 1,HTML,1,BODY,2,DIV,1,DIV,0,DIV,0,DIV,0,VIDEO

selector: div.video > div.container > div.video__embed > video

snippet: <video poster="https://videos.37signals.com/rails/rails-8-demo.webp" src="https://videos.37signals.com/rails/rails-8-demo.mp4" width="1920" height="1080" preload="metadata" controls="" crossorigin="">

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

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
rubyonrails.org/assets/css/style.css	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.

Diagnostics

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

URL	Transfer Size
videos.37signals.com/rails/rails-8-demo.mp4	2.0 MiB
videos.37signals.com/rails/rails-8-demo.webp	420.2 KiB
rubyonrails.org/assets/fonts/IBMPlexMono-Medium.woff2	39.6 KiB
rubyonrails.org/assets/fonts/IBMPlexMono-Text.woff2	39.3 KiB
rubyonrails.org/assets/fonts/calibre-bold.woff2	26.8 KiB
rubyonrails.org/assets/fonts/calibre-regular.woff2	26.1 KiB
rubyonrails.org/assets/fonts/calibre-semibold.woff2	26.1 KiB
videos.37signals.com/rails/rails-8-demo-en.vtt	25.0 KiB
rubyonrails.org/assets/css/style.css	10.7 KiB
rubyonrails.org/	5.5 KiB

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

	URL
Basecamp `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-basecamp.svg
HEY `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-hey.svg
GitHub `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-github.svg
Shopify `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-shopify.svg
Instacart `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-instacart.svg
Dribbble `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-dribbble.svg
Gusto `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-gusto.svg
Zendesk `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-zendesk.svg
Airbnb `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-airbnb.svg
Square `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-square.svg
Kickstarter `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-kickstarter.svg
Heroku `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-heroku.svg
Coinbase `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-coinbase.svg
Soundcloud `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-soundcloud.svg
Cookpad `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-cookpad.svg
Doximity `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-doximity.svg
Intercom `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-intercom.svg
Fleetio `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-fleetio.svg
Lime `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-lime.svg
FreeAgent `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-freeagent.svg
1password `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-1password.svg
PlanetScale `div.trusted__blocks > div.trusted__block > a > img`	rubyonrails.org/assets/images/logo-planetscale.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

●Modern HTTP

●Optimize viewport for mobile

●Time to Interactive 1.0 s

●Minify CSS

●Minify JavaScript

●Reduce unused CSS

●Reduce unused JavaScript

●JavaScript execution time 0.0 s

●Minimizes main-thread work 0.6 s

●Avoid long main-thread tasks 1 long task found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 0 ms

●Server Backend Latencies 90 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 180 ms

●Avoid large layout shifts 1 layout shift found

○INP breakdown

○User Timing marks and measures

○Avoid non-composited animations

Accessibility

Navigation

Failing Elements
Ruby on Rails scales from PROMPT to IPO. Token-efficient code that's easy for a… `div.container > div.heading__body > div.heading__headline > h4`
Over the past two decades, Rails has taken countless companies to millions of u… `div.container > div.heading__body > div.heading__headline > h4`
Over six thousand people have contributed code to Rails, and many more have ser… `div.container > div.heading__body > div.heading__headline > h4`
Rails is a full-stack framework. It ships with all the tools needed to build am… `div.container > div.heading__body > div.heading__headline > h4`
app/models/article.rb `div.example__body > div.example__block > div.example__code > h6`
app/controllers/articles_controller.rb `div.example__body > div.example__block > div.example__code > h6`
app/views/articles/show.html.erb `div.example__body > div.example__block > div.example__code > h6`
config/routes.rb `div.example__body > div.example__block > div.example__code > h6`
LEARNING `a > div.card__body > div.card__label > h6`
CONTRIBUTING `a > div.card__body > div.card__label > h6`
KEEPING UP `a > div.card__body > div.card__label > h6`

These are opportunities to improve keyboard navigation in your application.

Best practices

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Failing Elements
html `html`

These items highlight common accessibility best practices.

○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>`

●`[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

●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

●Touch targets have sufficient size and spacing.

●Uses ARIA roles only on compatible elements

○`[accesskey]` values are unique

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

○Deprecated ARIA roles were not used

○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

○`[role]`s have all required `[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

○`[role]` values are valid

○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

○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.

○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

●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

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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