C — https://diagrams.net | BeaverCheck Audit

Site Health

Score: 76 / 100

Based on 8 categories, 0 sections

Fast site — your users get a smooth experience.

Several missing protections leave your users and data exposed.

Several issues make your site difficult for assistive technology users.

Solid SEO basics — a few optimizations could boost rankings.

Solid infrastructure — fast server responses across the board.

Mostly compliant — a few items need attention.

Missing metadata means poor previews on social media and search.

Lean and efficient — low environmental impact per visit.

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.

How the composite score is calculated

How you compare

Animate.css · 34 peers

You 76

Avg 72

At average

0 50 100

Better than 73% of Animate.css sites See full Animate.css benchmark →

Bootstrap · 823 peers

You 76

Avg 73

At average

0 50 100

Better than 74% of Bootstrap sites See full Bootstrap benchmark →

Top Priorities (5)

Content-Security-Policy header is missing

Security gaps expose your site and users to attacks, eroding trust.

Security › Security Headers

No Content-Security-Policy header found

Security gaps expose your site and users to attacks, eroding trust.

Security › Content Security Policy

1 button(s) with no accessible text

Accessibility issues exclude users with disabilities — up to 15% of your potential audience.

Accessibility › Link & Button Quality

1 link(s) with no accessible text

Accessibility issues exclude users with disabilities — up to 15% of your potential audience.

Accessibility › Link & Button Quality

43 third-party resources (100% of weight)

Performance issues directly impact user engagement and conversion rates.

Performance › Page Weight Inventory

View fix priority matrix

Fix Priority Matrix

5 findings

Impact

Quick Wins

High impact, low effort — start here.

Strategic

High impact, requires investment.

Easy Improvements

Small gains, minimal effort.

Nothing in this quadrant — good news.

Deprioritize

Low impact, high effort — do last.

Nothing in this quadrant — good news.

← Low effort High effort →

Embed this badge

Markdown

[![BeaverCheck](https://beavercheck.com/badge?url=https%3A%2F%2Fdiagrams.net)](https://beavercheck.com/results/3d6f77f6-3bf8-4689-b09f-a04418135088)

HTML

<a href="https://beavercheck.com/results/3d6f77f6-3bf8-4689-b09f-a04418135088"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Fdiagrams.net" alt="BeaverCheck Score"></a>

Image URL

https://beavercheck.com/badge?url=https%3A%2F%2Fdiagrams.net

This badge auto-updates with your latest scan result.

What fixing these means

Your site performs reasonably well, but a few targeted fixes could meaningfully improve results. Your LCP of 4.6s exceeds Google's 2.5s 'Good' threshold and the 1 performance issue below directly contributes to it. Addressing the critical issues below would have the most immediate impact on your user trust.

2 security gaps detected — browsers may warn visitors about your site.

2 accessibility issues exclude users who rely on assistive technology.

Your LCP is 4.6s — fixing the 1 performance critical could bring it under Google's 2.5s 'Good' threshold.

Could reach Estimate based on resolving critical issues

Conversion Barriers

2 critical 5 warning

7 barrier(s) likely increasing bounce by ~29%.

Speed (1)

Page takes 4.6s to load

+12% bounce

Users abandon at ~3s — you're 2.1s over the 2.5s threshold

Fix: Optimize render-blocking resources, preload the hero image, and compress images

Trust (1)

No Content-Security-Policy header

+1% bounce

Higher XSS blast radius — one compromised script can exfiltrate the checkout form

Fix: Ship a reporting-only CSP first, then enforce once violations are clean

Content (3)

No Open Graph tags

+2% bounce

Links shared on LinkedIn / Slack / Facebook show bare URLs — referral clicks drop

Fix: Add og:title, og:description, og:image, og:url to the page head

No structured data

+2% bounce

No rich-result eligibility in Google — lower SERP CTR vs competitors with stars and prices

Fix: Add JSON-LD for your page type (Product, Article, FAQPage, LocalBusiness, …)

Thin content

+3% bounce

Under 300 words — visitors bounce looking for substance, search engines rank competitors first

Fix: Add a substantive FAQ, product detail, or case-study section

Navigation (2)

No skip-to-content link

+1% bounce

Keyboard and screen-reader users must tab through the entire header on every page

Fix: Add a visible-on-focus <a href="#main">Skip to content</a> as the first focusable element

11 broken link(s) on the page

+5% bounce

Clicks land on 404s — trust drops and the session often ends

Fix: Fix or remove the broken destinations surfaced on the Content tab

Preliminary CRO audit — each barrier links to the tab with detailed analysis.

Return on Investment

€510 investment → €2,861/month returns + EUR 20,500,000 risk avoided

Payback period: < 1 month First-year ROI: +6633%

Investment

€510

6h · 5 findings

Monthly returns

€2,861 /mo

~€34,338 / year

Conversions recovered €2,861
Bandwidth savings €0.17

Regulatory risk avoided

EUR 20,500,000

if kept compliant

GDPR EUR 20,000,000
EAA EUR 500,000

Payback period

0 12mo 24mo

€85 — in quick wins — start here for the fastest payback

Figures combine localized regulatory fine ceilings, search/conversion value priced against local CPC, and bandwidth waste estimates. Results depend on implementation quality and audience composition. Not legal or financial advice.

Full methodology & sources

Estimated Remediation Cost

€510

6.0 developer hours at €85/hr

Based on European Union rates (€85/hr)

Quick wins

€85 2 fixes in ~60 minutes

Start here for the best return on investment

Cost by category

Cost by effort level

Adjust assumptions

Custom rate

€ /hr

Rates reflect fully-loaded developer cost including overhead

How developer rates are sourced

What Inaction Is Costing You

€1,708,333 / month at risk

~€20,500,002 / year if left unfixed

Compliance Risk

€20,500,000

GDPREAA

Privacy Policy not detected
GDPR: EUR 10,000 – EUR 20,000,000
Skip navigation link is missing (WCAG 2.4.1)
EAA: EUR 1,000 – EUR 500,000
Heading level skipped: H2 → H4 (missing H3)
EAA: EUR 1,000 – EUR 500,000

Bandwidth Waste

€0.17 /mo

2247.0 MB/mo × 0.074 EUR/GB

Optimize transfer: save ~225 KB per page load
Saves €0.17/mo

Compliance figures represent the statutory maximum fine for the most severe triggered category, capped per regulation — not the sum of per-finding penalties. Based on published regulatory fine ranges. This is not legal advice.

Compliance methodology · SEO assumptions · Bandwidth model

Your performance is already good — improvements may show diminishing returns

Monthly visitors

Unique monthly visitors from your analytics

Conversion rate (%)

Purchases, signups, or key actions

Avg. order value

Optional — for revenue estimation

additional conversions/month

more engaged visitors from reduced bounce

potential monthly revenue

Current bounce (est.)

After fixes (est.)

Estimated bounce reduction

Fix 4 critical issues to capture this value

How this is calculated

Based on Google/Deloitte research ("Milliseconds Make Millions") showing a ~7% bounce rate increase per additional second of LCP above the 2.5s "Good" threshold.

Your site's LCP: → estimated after fixes.

These are estimates based on industry research — actual results vary

Bounce-rate model & assumptions

Your data stays in your browser — nothing is sent to our servers

Was this report useful?

Thanks for your feedback!

We'll use a cached audit if available, or offer to scan.

Checking for existing audit...

Press ? for shortcuts

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse.

Performance

Accessibility

100

Best Practices

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.

3.85 s

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

4.64 s

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

0 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.

4.90 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.

4.64 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.

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

Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.

Learn more ▾

Most users today run browsers that natively support ES6+, async/await, optional chaining, and the rest of modern JavaScript. Transpiling to ES5 'just in case' adds 20-40% to your bundle for no benefit. Configure your build to target a modern browserslist, or ship a differential bundle pair (modern + legacy) with the module/nomodule pattern.

Source: Google web.dev / Lighthouse

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.

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Est Savings
www.drawio.com/assets/webfonts/fa-solid-900.woff2	90 ms
fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2	45 ms
fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2	40 ms
fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLGT9Z1xlFd2JQEk.woff2	30 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-0-IMG

nodeLabel: Example diagram

path: 1,HTML,1,BODY,7,MAIN,1,DIV,0,DIV,1,DIV,0,IMG

selector: div.container > div.row > div.col-lg-6 > img.img-fluid

snippet: <img class="img-fluid" src="assets/svg/home-dia1.svg" style="padding-bottom: 100px;" alt="Example diagram">

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
fonts.googleapis.com/css?family=Lato&display=swap	482 B	176 ms
fonts.googleapis.com/css?family=Poppins:300,400,500,600,700	1.0 KiB	833 ms
www.drawio.com/assets/css/theme.css	62.4 KiB	1.0 s
www.drawio.com/assets/css/animate.min.css	4.7 KiB	167 ms
www.drawio.com/assets/css/fontawesome-all.min.css	12.2 KiB	167 ms
www.drawio.com/assets/css/hs.megamenu.css	1.1 KiB

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
static.cloudflareinsights.com/beacon.min.js	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.

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 803 ms

URL	Time Spent
diagrams.net/	803 ms
www.drawio.com/	0.0 ms

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

Diagnostics

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 20 ms 13.1 KiB

URL	Transfer Size	Est Savings
www.drawio.com/assets/css/theme.css	62.4 KiB	13.1 KiB

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 300 ms 72.3 KiB

URL	Transfer Size	Est Savings
www.drawio.com/assets/css/theme.css	62.1 KiB	60.4 KiB
www.drawio.com/assets/css/fontawesome-all.min.css	12.0 KiB	11.9 KiB

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
Example diagram `div.container > div.row > div.col-lg-6 > img.img-fluid`	www.drawio.com/assets/svg/home-dia1.svg
Example diagram 2 `div.col-lg-7 > div.tab-content > div#pills-one-code-features > img.img-fluid`	www.drawio.com/assets/svg/home-dia2.svg

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

●Layout shift culprits

●Optimize DOM size

●Forced reflow

●Improve image delivery

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Max Potential First Input Delay 40 ms

●Minify JavaScript

●Reduce unused JavaScript

●Avoids enormous network payloads Total size was 731 KiB

●JavaScript execution time 0.1 s

●Minimizes main-thread work 0.7 s

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 30 ms

●Server Backend Latencies 50 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 40 ms

○INP breakdown

○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.

ARIA

Some ARIA parent roles must contain specific child roles to perform their intended accessibility functions. Learn more about roles and required children elements.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Share with everyone Don't worry about licenses or platforms, it just works. P… `div.container > div.row > div.col-lg-5 > ul.nav`

Some ARIA child roles must be contained by specific parent roles to properly perform their intended accessibility functions. Learn more about ARIA roles and required parent element.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Share with everyone Don't worry about licenses or platforms, it just works. `div.col-lg-5 > ul.nav > li.nav-item > a#pills-one-code-features-tab`
Powerful features Collaborate with shared cursors in real-time. draw.io has ev… `div.col-lg-5 > ul.nav > li.nav-item > a#pills-two-code-features-tab`
Privacy first Store your data wherever you want to. We cannot access your data. `div.col-lg-5 > ul.nav > li.nav-item > a#pills-three-code-features-tab`

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.

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.js-form-message > div.input-group > div.input-group-append > button.btn `div.js-form-message > div.input-group > div.input-group-append > button.btn`

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
draw.io `div#logoAndNav > nav.js-mega-menu > a.navbar-brand > span.u-header__navbar-brand-text`
Bring your storage to our online tool, or save locally with the desktop app. `div.row > div.col-lg-5 > div.mb-5 > p`
Describe your diagram: `div.container > div.row > div.col-lg-5 > p.small`
Start `div.row > div.col-lg-5 > div.mb-3 > a#startButton`
Download `div.row > div.col-lg-5 > div.mb-3 > a.btn`
No login or registration required. Diagram generation uses OpenAI. `div.container > div.row > div.col-lg-5 > p.small`
Share with everyone `a#pills-one-code-features-tab > div.media > div.media-body > h3.h6`
Don't worry about licenses or platforms, it just works. `a#pills-one-code-features-tab > div.media > div.media-body > p.mb-0`
Collaborate with shared cursors in real-time. draw.io has everything you expect… `a#pills-two-code-features-tab > div.media > div.media-body > p.mb-0`
Store your data wherever you want to. We cannot access your data. `a#pills-three-code-features-tab > div.media > div.media-body > p.mb-0`
More features `div.col-lg-7 > div.w-md-80 > p.mb-0 > a`
Example diagrams & templates `div.col-lg-7 > div.w-md-80 > p.mb-0 > a`
Works with Google Drive and Google Workplace (G Suite). `div.container > div.row > div.col-sm-6 > p`
Google Drive `div.row > div.col-sm-6 > p > a`
Google Workplace `div.row > div.col-sm-6 > p > a`
Works with OneDrive and Sharepoint. Office 365 and Microsoft Teams apps provide… `div.container > div.row > div.col-sm-6 > p`
OneDrive and Sharepoint `div.row > div.col-sm-6 > p > a`
Office 365 `div.row > div.col-sm-6 > p > a`
Microsoft Teams `div.row > div.col-sm-6 > p > a`
Highest-rated Confluence app, delivered by us as draw.io. Also for Jira. `div.container > div.row > div.col-sm-6 > p`
Confluence app `div.row > div.col-sm-6 > p > a`
Jira `div.row > div.col-sm-6 > p > a`
Works with GitHub, GitLab and Dropbox for visual documentation in distributed t… `div.container > div.row > div.col-sm-6 > p`
GitHub `div.row > div.col-sm-6 > p > a`
GitLab `div.row > div.col-sm-6 > p > a`
Dropbox `div.row > div.col-sm-6 > p > a`
Download draw.io Desktop for offline use, or draw.io for VSCode.* `div.container > div.row > div.col-sm-6 > p`
draw.io Desktop `div.row > div.col-sm-6 > p > a`
draw.io for VSCode `div.row > div.col-sm-6 > p > a`
Embed and edit diagrams directly with the draw.io for Notion Chrome extension. `div.container > div.row > div.col-sm-6 > p`
draw.io for Notion Chrome extension `div.row > div.col-sm-6 > p > a`
See more `div.container > div.text-center > div.mb-3 > a.btn`
Start Now `div.container > div.text-center > div.mb-3 > a.btn`
* Third-party integration. `main#content > div.container > div.text-center > p.small`

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
OneDrive and Sharepoint `div.row > div.col-sm-6 > p > a`
Office 365 `div.row > div.col-sm-6 > p > a`
Microsoft Teams `div.row > div.col-sm-6 > p > a`
Confluence app `div.row > div.col-sm-6 > p > a`
Jira `div.row > div.col-sm-6 > p > a`
GitHub `div.row > div.col-sm-6 > p > a`
GitLab `div.row > div.col-sm-6 > p > a`
Dropbox `div.row > div.col-sm-6 > p > a`
draw.io for Notion Chrome extension `div.row > div.col-sm-6 > p > a`

These are opportunities to improve the legibility of your content.

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
Google Workplace and Google Drive `div.col-sm-6 > div.media > div.media-body > h4.h6`

These are opportunities to improve keyboard navigation in your application.

Internationalization and localization

If a page doesn't specify a `lang` attribute, a screen reader assumes that the page is in the default language that the user chose when setting up the screen reader. If the page isn't actually in the default language, then the screen reader might not announce the page's text correctly. Learn more about the `lang` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html `html`

These are opportunities to improve the interpretation of your content by users in different locales.

Tables and lists

Screen readers require list items (`<li>`) to be contained within a parent `<ul>`, `<ol>` or `<menu>` to be announced properly. Learn more about proper list structure.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Share with everyone Don't worry about licenses or platforms, it just works. `div.row > div.col-lg-5 > ul.nav > li.nav-item`
Powerful features Collaborate with shared cursors in real-time. draw.io has ev… `div.row > div.col-lg-5 > ul.nav > li.nav-item`
Privacy first Store your data wherever you want to. We cannot access your data. `div.row > div.col-lg-5 > ul.nav > li.nav-item`

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

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
draw.io `div.u-header__section > div#logoAndNav > nav.js-mega-menu > a.navbar-brand`
draw.io `div.container > div.row > div.col-lg-4 > a.d-inline-flex`

○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

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

●Elements use only permitted ARIA attributes

●Document has a `<title>` element

●Links have a discernible name

●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

●Touch targets have sufficient size and spacing.

●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 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 a valid value for its `[lang]` attribute

○`<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.

○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

●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

●Ensure proper origin isolation with COOP

●Mitigate clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Use a strong HSTS policy

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
app.diagrams.net/?src=about	Start
www.drawio.com/integrations.html	See more

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

●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

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.

850 ms

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

1.04 s

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

0 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.

850 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.

1.04 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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Why this matters

Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.

Learn more ▾

Source: Google web.dev / Lighthouse

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.

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Est Savings
www.drawio.com/assets/webfonts/fa-solid-900.woff2	85 ms
fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2	40 ms
fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLGT9Z1xlFd2JQEk.woff2	35 ms
fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2	30 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-0-IMG

nodeLabel: Example diagram

path: 1,HTML,1,BODY,7,MAIN,1,DIV,0,DIV,1,DIV,0,IMG

selector: div.container > div.row > div.col-lg-6 > img.img-fluid

snippet: <img class="img-fluid" src="assets/svg/home-dia1.svg" style="padding-bottom: 100px;" alt="Example diagram">

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.

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
fonts.googleapis.com/css?family=Poppins:300,400,500,600,700	667 B	287 ms
fonts.googleapis.com/css?family=Lato&display=swap	853 B	69 ms
www.drawio.com/assets/css/theme.css	62.4 KiB	112 ms
www.drawio.com/assets/css/fontawesome-all.min.css	12.2 KiB	56 ms
www.drawio.com/assets/css/animate.min.css	4.7 KiB
www.drawio.com/assets/css/hs.megamenu.css	1.1 KiB

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
static.cloudflareinsights.com/beacon.min.js	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

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 13.1 KiB

URL	Transfer Size	Est Savings
www.drawio.com/assets/css/theme.css	62.4 KiB	13.1 KiB

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 71.8 KiB

URL	Transfer Size	Est Savings
www.drawio.com/assets/css/theme.css	62.1 KiB	60.0 KiB
www.drawio.com/assets/css/fontawesome-all.min.css	12.0 KiB	11.9 KiB

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
Example diagram `div.container > div.row > div.col-lg-6 > img.img-fluid`	www.drawio.com/assets/svg/home-dia1.svg
Example diagram 2 `div.col-lg-7 > div.tab-content > div#pills-one-code-features > img.img-fluid`	www.drawio.com/assets/svg/home-dia2.svg

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

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 246 ms

URL	Time Spent
diagrams.net/	246 ms
www.drawio.com/	0.0 ms

●Layout shift culprits

●Optimize DOM size

●Forced reflow

●Improve image delivery

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Time to Interactive 1.0 s

●Max Potential First Input Delay 20 ms

●Minify JavaScript

●Reduce unused JavaScript

●Avoids enormous network payloads Total size was 731 KiB

●JavaScript execution time 0.0 s

●Minimizes main-thread work 0.2 s

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 30 ms

●Server Backend Latencies 50 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 60 ms

●Avoid large layout shifts 2 layout shifts found

○INP breakdown

○User Timing marks and measures

○Avoid long main-thread tasks

○Avoid non-composited animations

Accessibility

ARIA

Some ARIA parent roles must contain specific child roles to perform their intended accessibility functions. Learn more about roles and required children elements.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Share with everyone Don't worry about licenses or platforms, it just works. P… `div.container > div.row > div.col-lg-5 > ul.nav`

Some ARIA child roles must be contained by specific parent roles to properly perform their intended accessibility functions. Learn more about ARIA roles and required parent element.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Share with everyone Don't worry about licenses or platforms, it just works. `div.col-lg-5 > ul.nav > li.nav-item > a#pills-one-code-features-tab`
Powerful features Collaborate with shared cursors in real-time. draw.io has ev… `div.col-lg-5 > ul.nav > li.nav-item > a#pills-two-code-features-tab`
Privacy first Store your data wherever you want to. We cannot access your data. `div.col-lg-5 > ul.nav > li.nav-item > a#pills-three-code-features-tab`

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.

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.js-form-message > div.input-group > div.input-group-append > button.btn `div.js-form-message > div.input-group > div.input-group-append > button.btn`

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Blog `div#navBar > ul.navbar-nav > li.nav-item > a#blogMegaMenu`
Start Now `div#navBar > ul.navbar-nav > li.nav-item > a.btn`
Bring your storage to our online tool, or save locally with the desktop app. `div.row > div.col-lg-5 > div.mb-5 > p`
Describe your diagram: `div.container > div.row > div.col-lg-5 > p.small`
Start `div.row > div.col-lg-5 > div.mb-3 > a#startButton`
Download `div.row > div.col-lg-5 > div.mb-3 > a.btn`
No login or registration required. Diagram generation uses OpenAI. `div.container > div.row > div.col-lg-5 > p.small`
Share with everyone `a#pills-one-code-features-tab > div.media > div.media-body > h3.h6`
Don't worry about licenses or platforms, it just works. `a#pills-one-code-features-tab > div.media > div.media-body > p.mb-0`
Collaborate with shared cursors in real-time. draw.io has everything you expect… `a#pills-two-code-features-tab > div.media > div.media-body > p.mb-0`
Store your data wherever you want to. We cannot access your data. `a#pills-three-code-features-tab > div.media > div.media-body > p.mb-0`
Works with Google Drive and Google Workplace (G Suite). `div.container > div.row > div.col-sm-6 > p`
Google Drive `div.row > div.col-sm-6 > p > a`
Google Workplace `div.row > div.col-sm-6 > p > a`
Works with OneDrive and Sharepoint. Office 365 and Microsoft Teams apps provide… `div.container > div.row > div.col-sm-6 > p`
OneDrive and Sharepoint `div.row > div.col-sm-6 > p > a`
Office 365 `div.row > div.col-sm-6 > p > a`
Microsoft Teams `div.row > div.col-sm-6 > p > a`
Highest-rated Confluence app, delivered by us as draw.io. Also for Jira. `div.container > div.row > div.col-sm-6 > p`
Confluence app `div.row > div.col-sm-6 > p > a`
Jira `div.row > div.col-sm-6 > p > a`
Works with GitHub, GitLab and Dropbox for visual documentation in distributed t… `div.container > div.row > div.col-sm-6 > p`
GitHub `div.row > div.col-sm-6 > p > a`
GitLab `div.row > div.col-sm-6 > p > a`
Dropbox `div.row > div.col-sm-6 > p > a`
Download draw.io Desktop for offline use, or draw.io for VSCode.* `div.container > div.row > div.col-sm-6 > p`
draw.io Desktop `div.row > div.col-sm-6 > p > a`
draw.io for VSCode `div.row > div.col-sm-6 > p > a`
Embed and edit diagrams directly with the draw.io for Notion Chrome extension. `div.container > div.row > div.col-sm-6 > p`
draw.io for Notion Chrome extension `div.row > div.col-sm-6 > p > a`
See more `div.container > div.text-center > div.mb-3 > a.btn`
Start Now `div.container > div.text-center > div.mb-3 > a.btn`
* Third-party integration. `main#content > div.container > div.text-center > p.small`

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
OneDrive and Sharepoint `div.row > div.col-sm-6 > p > a`
Office 365 `div.row > div.col-sm-6 > p > a`
Microsoft Teams `div.row > div.col-sm-6 > p > a`
Confluence app `div.row > div.col-sm-6 > p > a`
Jira `div.row > div.col-sm-6 > p > a`
GitHub `div.row > div.col-sm-6 > p > a`
GitLab `div.row > div.col-sm-6 > p > a`
Dropbox `div.row > div.col-sm-6 > p > a`
draw.io for Notion Chrome extension `div.row > div.col-sm-6 > p > a`

These are opportunities to improve the legibility of your content.

Navigation

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Google Workplace and Google Drive `div.col-sm-6 > div.media > div.media-body > h4.h6`

These are opportunities to improve keyboard navigation in your application.

Internationalization and localization

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html `html`

These are opportunities to improve the interpretation of your content by users in different locales.

Tables and lists

Screen readers require list items (`<li>`) to be contained within a parent `<ul>`, `<ol>` or `<menu>` to be announced properly. Learn more about proper list structure.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Share with everyone Don't worry about licenses or platforms, it just works. `div.row > div.col-lg-5 > ul.nav > li.nav-item`
Powerful features Collaborate with shared cursors in real-time. draw.io has ev… `div.row > div.col-lg-5 > ul.nav > li.nav-item`
Privacy first Store your data wherever you want to. We cannot access your data. `div.row > div.col-lg-5 > ul.nav > li.nav-item`

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

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
draw.io `div.u-header__section > div#logoAndNav > nav.js-mega-menu > a.navbar-brand`
draw.io `div.container > div.row > div.col-lg-4 > a.d-inline-flex`

○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

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

●Elements use only permitted ARIA attributes

●Document has a `<title>` element

●Links have a discernible name

●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

●Touch targets have sufficient size and spacing.

●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 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 a valid value for its `[lang]` attribute

○`<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.

○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

●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

●Ensure proper origin isolation with COOP

●Mitigate clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Use a strong HSTS policy

SEO

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
app.diagrams.net/?src=about	Start
www.drawio.com/integrations.html	See more

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

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

○Document has a valid `rel=canonical`

Results for https://diagrams.net

Site Health

How you compare

Top Priorities (5)

Fix Priority Matrix

Quick Wins

Strategic

Easy Improvements

Deprioritize

What fixing these means

Conversion Barriers

Speed (1)

Trust (1)

Content (3)

Navigation (2)

Return on Investment

Investment

Monthly returns

Regulatory risk avoided

Payback period

Estimated Remediation Cost

Cost by category

Cost by effort level

What Inaction Is Costing You

Compliance Risk

Bandwidth Waste

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

ARIA

Names and labels

Contrast

Navigation

Internationalization and localization

Tables and lists

Best Practices

SEO

Content Best Practices

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

ARIA

Names and labels

Contrast

Navigation

Internationalization and localization

Tables and lists

Best Practices

SEO

Content Best Practices

Keyboard Shortcuts