html5rocks.com
web.dev
Last scanned Aug 3, 2026, 4:00 AM · 6 views
Overall score
Excellent
Summary
Guidance to build modern web experiences that work in every browser. This website uses Google Analytics. SEO is good (80/100) and accessibility is excellent (90/100). Security scores excellent (90/100) and performance excellent (100/100). Top issue: No H1 heading found.
web.dev
Guidance to build modern web experiences that work in every browser.
Top issues to fix
5 issues found · 1 high priority
No H1 heading found
SEOAdd exactly one H1 describing the page's main topic — it anchors the document outline for search engines and screen readers.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
robots.txt not found
SEOPublish /robots.txt with a Sitemap: directive to guide crawlers.
sitemap.xml not found
SEOPublish an XML sitemap and reference it from robots.txt to speed up page discovery.
20 broken links on the page
SEOFix or remove broken links — they waste crawl budget and erode user trust.
SEO
3 issue(s) found
Performance
868 ms
Security
HTTPS & header checks
Accessibility
1 issue(s) found
Score history
0 overall since Jul 26, 2026
- Overall
- 90
- SEO
- 80
- Security
- 90
- Performance
- 100
- Accessibility
- 90
Organization
Company details published in this site's own structured data.
Meta tags
- Title
- web.dev
- Description
- Guidance to build modern web experiences that work in every browser.
- Canonical
- https://web.dev/
- Language
- en
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1
- Robots meta
- Manifest
- https://web.dev/_pwa/web/manifest.json
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- —
- CDN provider
- —
- IP address
- —
- ASN
- —
DNS records
| Type | Value |
|---|---|
| A | — |
| AAAA | — |
| MX | — |
| TXT | — |
| NS | — |
| CAA | — |
| CNAME | — |
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Google Trust Services
- Subject
- devsite-sni.developers.google.com
- Valid from
- Jun 29, 2026
- Valid to
- Sep 21, 2026
- Days until expiry
- 49
- SAN domains
- devsite-sni.developers.google.com, docs.actifio.com, d.actifio.com, apigee.com, *.apigee.com, appdefensealliance.dev, *.appdefensealliance.dev, bazel.build, *.bazel.build, builders.google, *.builders.google, cel.dev, *.cel.dev, deepmind.google.com, *.deepmind.google.com, developer.nest.com, developers.nest.com, devsitetest.how, *.devsitetest.how, fuchsia.dev, *.fuchsia.dev, issues.fuchsia.dev, *.issues.fuchsia.dev, generativeai.google, *.generativeai.google, *.generativeai.google.com, google.dev, ai.google.dev, www.ai.google.dev, *.google.dev, intrinsic.ai, *.intrinsic.ai, jibemobile.com, *.jibemobile.com, learn.mapsplatform.google.com, *.learn.mapsplatform.google.com, onboarding.off.goog, *.onboarding.off.goog, openthread.io, *.openthread.io, openweave.io, *.openweave.io, openxla.org, *.openxla.org, preview.source.android.com, privacysandbox.google.com, *.privacysandbox.google.com, quantumai.google, *.quantumai.google, tensorflow.org, *.tensorflow.org, web.dev, *.web.dev, webrtc.org, www.webrtc.org, wing.com, *.wing.com, wing.dev, *.wing.dev, devsite.google, *.devsite.google, mediapipe.dev, *.mediapipe.dev, ai.dev, *.ai.dev, ai.studio, *.ai.studio, app.new, *.app.new, chat.new, *.chat.new, bot.new, *.bot.new, agent.new, *.agent.new, ai.app, *.ai.app
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyEnabled
- X-Frame-OptionsMissing
- X-Content-Type-OptionsEnabled
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 0 · H2 9 · H3 40
Links
50 internal · 12 external · 20 broken
Images
10 total · 0 missing alt
Scripts / Styles
3 scripts · 4 stylesheets
JS / CSS size
7.0 KB · 1.0 KB
Page size
131 KB
Robots.txt & Sitemap
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- No H1 heading found
- robots.txt not found
- sitemap.xml not found
Accessibility issues
- No H1 heading found
Scan details
- Requested URL
- https://html5rocks.com
- Final URL
- https://web.dev/
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 866 ms
- HTML size
- 131 KB
- Redirect chain
- https://html5rocks.com → https://web.dev/
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does html5rocks.com use?
- html5rocks.com is built with Google Analytics.
- Is html5rocks.com secure (HTTPS)?
- Yes. html5rocks.com uses TLS 1.3 with a certificate issued by Google Trust Services, valid until Sep 21, 2026.
- Who hosts html5rocks.com?
- Hosting provider information for html5rocks.com is not available yet.
- What is html5rocks.com's SEO score?
- html5rocks.com scored 80/100 for SEO in the latest analysis (great).
- What is html5rocks.com's overall website score?
- html5rocks.com has an overall SiteGraph score of 90/100, combining SEO, performance, security, and accessibility.
- What company operates html5rocks.com?
- html5rocks.com is operated by web.dev. Guidance to build modern web experiences that work in every browser.
- Has html5rocks.com's score changed over time?
- html5rocks.com's overall score has stayed steady at 90/100 since Jul 26, 2026.
OpenGraph & Twitter Card
OpenGraph
Twitter Card