Developer.mozilla.org - SEO Checker

Sign up for free! PDF Export
Overview of the SEO Check
Meta information
85% 
Page quality
94% 
Page structure
100% 
Link structure
82% 
Server
100% 
External factors
100% 
SEO Score
Response time
0.32 s
File size
41.70 kB
Words
546
Media files
1
Number of links
59 internal / 34 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
MDN Web Docs
The page title is too short. (146 pixels of 580 max pixel length) Optimize title
There are no duplicate words in the title
Meta description
(Critically important)
The MDN Web Docs site provides information about Open Web technologies including HTML, CSS, and APIs for both Web sites and progressive web apps.
The length of the meta description is perfect. (961 pixels out of 1000 max pixel length)
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
https://developer.mozilla.org/es/
There is a valid canonical link specified.
Language
(Somewhat important)
Language detected in text: en
Language defined in HTML: en-us
Server location: United States of America
The following language is defined by HTML: en-us
Alternate/Hreflang Links
(Somewhat important)
The alternate link to the page itself is missing.
Other meta tags
(Somewhat important)
There is no rel next meta tag on this page.
There is no rel prev meta tag on this page.
Domain
(Somewhat important)
This page is hosted on a subdomain. Use a top level domain for better SEO results.
The domain does not contain non-latin characters.
Page URL
(Somewhat important)
No parameters were found in the URL.
No session ID was found in the URL.
The URL does not have too many subdirectories.
Charset encoding
(Somewhat important)
The character encoding is not specified in the HTTP header.
The charset encoding (UTF-8) is set correctly.
Doctype
(Nice to have)
The doctype HTML 5 is set correctly.
The doctype is placed at first in the HTML code.
Favicon
(Nice to have)
The favicon is linked correctly.

Meta tags

NameValue
viewportwidth=device-width,initial-scale=1
theme-color#ffffff
descriptionThe MDN Web Docs site provides information about Open Web technologies including HTML, CSS, and APIs for both Web sites and progressive web apps.
langen-us
twitter:cardsummary_large_image
twitter:creatorMozDevNet
og:urlhttps://developer.mozilla.org
og:titleMDN Web Docs
og:typewebsite
og:localeen_US
og:descriptionThe MDN Web Docs site provides information about Open Web technologies including HTML, CSS, and APIs for both Web sites and progressive web apps.
og:imagehttps://developer.mozilla.org/mdn-social-share.cd6c4a5a.png
og:image:typeimage/png
og:image:height1080
og:image:width1920
og:image:altThe MDN Web Docs logo, featuring a blue accent color, displayed on a solid black background.
og:site_nameMDN Web Docs
charsetutf-8

Test up to 1.000 webpages of developer.mozilla.org with our free plan!

Try For Free
No trial. It's just free!

Page quality

Content
(Critically important)
These Typos were found:
  • improvments => improvements
This page contains 546 words. That's ok.
22.9% of the text are stop words.
Keywords used in the page title are also used in the page content. That's good!
Words from the H1 heading are used in the page content.
The page contains a listing, which indicates a good text layout.
6 paragraphs were found on this page.
The text content is perfect.
No placeholders texts or images were found.
There are no duplicates on the site.
The average number of words per sentence of 14.33 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
A viewport "width=device-width,initial-scale=1" is provided.
At least one Apple touch icon is specified.
Bold and strong tags
(Somewhat important)
The usage of strong and bold tags is perfect. We recommend the use of up to 11 tags for this page.
Image SEO
(Somewhat important)
Alt text (alternative text) is correctly used on all found images.
Social Networks
(Nice to have)
There are only a few social sharing widgets on the page. Make your website popular in social networks with social sharing widgets.
Additional markup
(Nice to have)
No additional page markup was found.
HTTPS
(Somewhat important)
This website uses HTTPS to protect privacy and integrity of the exchanged data.
All included files are also transferred via HTTPS.

Media list

URLAlt attributeTitle
/assets/mdn_contributor.pngTiled Mozilla Logo

Page structure

H1 heading
(Critically important)
Resources for Developers, by Developers
The H1 heading is perfect.
Headings
(Important)
The heading structure is perfect.

Heading structure

Heading levelContent
H1 Resources for Developers, by Developers
H2 Featured articles
H2 Latest news
H2 Recent contributions
H2 MDN
H2 Support
H2 Our communities
H2 Developers
H3 Developer essentials: JavaScript console methods
H3 Introduction to web sustainability
H3 CSS Custom Highlight API
H3 <color>
H3 Contributor Spotlight
Some anchor texts are used more than once.
1 links don't have an anchor text.
The number of internal links is ok.
None of the anchor texts is too long.
All internal links are not using dynamic parameters.
There are too many external links (34) on this page.

Found links on this page

LinkAttributesAnchor text
https://developer.mozilla.org/es/Anchor Skip to main content
https://developer.mozilla.org/es/Anchor Skip to search
https://developer.mozilla.org/es/No Text
/es/docs/WebReferences
/es/docs/WebOverview / Web Technology Web technology reference for developers
/es/docs/Web/HTMLHTML Structure of content on the web
/es/docs/Web/CSSCSS Code used to describe document style
/es/docs/Web/JavaScriptJavaScript General-purpose scripting language
/es/docs/Web/HTTPHTTP Protocol for transmitting web resources
/es/docs/Web/APIWeb APIs Interfaces for building web applications
/es/docs/Mozilla/Add-ons/WebEx...Web Extensions Developing extensions for web browsers
/es/docs/WebWeb Technology Web technology reference for developers
/es/docs/LearnGuides
/es/docs/LearnOverview / MDN Learning Area Learn web development
/es/docs/LearnMDN Learning Area Learn web development
/es/docs/Learn/HTMLHTML Learn to structure web content with HTML
/es/docs/Learn/CSSCSS Learn to style content using CSS
/es/docs/Learn/JavaScriptJavaScript Learn to run scripts in the browser
/es/docs/Web/AccessibilityAccessibility Learn to make the web accessible to all
/es/plusPlus
/es/plusOverview A customized MDN experience
/es/plus/ai-helpAI Help (beta) Get real-time assistance and support
/es/plus/updatesUpdates All browser compatibility updates at a glance
/en-US/plus/docs/features/over...Documentation Learn how to use MDN Plus
/en-US/plus/docs/faqFAQ Frequently asked questions about MDN Plus
/en-US/curriculum/CurriculumNew
/en-US/blog/Blog
/es/playPlay
/en-US/plus/ai-helpAI Help Beta
/users/fxa/login/authenticate/...Nofollow Log in
/users/fxa/login/authenticate/...Nofollow Sign up for free
/en-US/blog/Text duplicate Blog
/en-US/blog/learn-javascript-c...Developer essentials: JavaScript console methods
/en-US/blog/Text duplicate Blog
/en-US/blog/introduction-to-we...Introduction to web sustainability
/en-US/docs/Web/APIWeb APIs
/en-US/docs/Web/API/CSS_Custom...CSS Custom Highlight API
/es/docs/Web/CSSCSS
/es/docs/Web/CSS/color_value<color>
/en-US/blog/mdn-curriculum-lau...Lift-off: The MDN Curriculum launch
/en-US/blog/developer.mozilla.org
/en-US/blog/baseline-evolution...Baseline's evolution on MDN
/en-US/blog/Text duplicate developer.mozilla.org
/en-US/blog/introducing-the-md...Introducing the MDN Playground: Bring your code to life!
/en-US/blog/Text duplicate developer.mozilla.org
https://github.com/mdn/content...External Fix CHIPS typo
https://github.com/mdn/contentExternal mdn/content
https://github.com/mdn/content...External Add link to preconnect
https://github.com/mdn/contentExternal Text duplicate mdn/content
https://github.com/mdn/content...External minor improvments to 'information for web authors'
https://github.com/mdn/contentExternal Text duplicate mdn/content
https://github.com/mdn/content...External Refer from <select> to HTMLSelectElement.value
https://github.com/mdn/contentExternal Text duplicate mdn/content
https://github.com/mdn/transla...External [ko] sync translated content
https://github.com/mdn/transla...External mdn/translated-content
https://github.com/mdn/content...External Remove JS select implementation
https://github.com/mdn/contentExternal Text duplicate mdn/content
https://github.com/mdn/transla...External zh-CN: update Glossary/Fetch_directive
https://github.com/mdn/transla...External Text duplicate mdn/translated-content
https://github.com/mdn/transla...External zh-cn: update translation Glossary/Information_architecture
https://github.com/mdn/transla...External Text duplicate mdn/translated-content
https://github.com/mdn/transla...External [zh-cn]: update the translation of `webrtc-data-channels`
https://github.com/mdn/transla...External Text duplicate mdn/translated-content
https://github.com/mdn/transla...External zh-cn: update translation Glossary/Fallback_Alignment
https://github.com/mdn/transla...External Text duplicate mdn/translated-content
/es/community/spotlight/yujiYuji
/en-US/communityGet involved →
https://developer.mozilla.org/No Text
https://mozilla.social/@mdnNew window External MDN on Mastodon
https://twitter.com/mozdevnetNew window External MDN on X (formerly Twitter)
https://github.com/mdn/New window External MDN on GitHub
/en-US/blog/rss.xmlNew window MDN Blog RSS Feed
/en-US/aboutAbout
/en-US/blog/Text duplicate Blog
https://www.mozilla.org/en-US/...New window External Subdomain Careers
/en-US/advertisingAdvertise with us
https://support.mozilla.org/pr...External Subdomain Product help
/es/docs/MDN/Community/IssuesReport an issue
/en-US/communityMDN Community
https://discourse.mozilla.org/...New window External Subdomain MDN Forum
/discordNew window MDN Chat
/es/docs/WebWeb Technologies
/es/docs/LearnLearn Web Development
/es/plusMDN Plus
https://hacks.mozilla.org/New window External Subdomain Hacks Blog
https://www.mozilla.org/New window External Subdomain No Text
https://www.mozilla.org/privac...New window External Subdomain Website Privacy Notice
https://www.mozilla.org/privac...New window External Subdomain Anchor Cookies
https://www.mozilla.org/about/...New window External Subdomain Legal
https://www.mozilla.org/about/...New window External Subdomain Community Participation Guidelines
https://www.mozilla.org/New window External Subdomain Mozilla Corporation’s
https://foundation.mozilla.org/New window External Subdomain Mozilla Foundation
/es/docs/MDN/Writing_guideline...a Creative Commons license

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://developer.mozilla.org/es/"
HTTP header
(Important)
No X-Powered HTTP header is sent.
This page uses GZip for compressed data transmission.
Performance
(Somewhat important)
The page response time is excellent with 0.32 seconds.
The file size of the HTML document is fine (42 kB).

HTTP Response Header

NameValue
x-goog-generation1717202819830850
x-goog-metageneration1
x-goog-stored-content-encodingidentity
x-goog-stored-content-length42737
x-goog-meta-goog-reserved-file-mtime1717200953
x-goog-hashcrc32c=CQ9gfA==, md5=hSzigCA3SxW2QAoxjhvJSw==
x-goog-storage-classSTANDARD
accept-rangesnone
x-guploader-uploadidABPtcPqdXwTxLbEAL5oKCM2E9ZWejD3zJFmy2Kzu9YKWGodYefNpD-Q8EYWOH9PeQRo9e9bV5E-CcEiklg
expiresSat, 01 Jun 2024 07:51:55 GMT
cache-controlpublic, max-age=3600
last-modifiedSat, 01 Jun 2024 00:46:59 GMT
etagW/"852ce28020374b15b6400a318e1bc94b"
content-typetext/html
age0
alt-svch3=":443"; ma=2592000
x-content-type-optionsnosniff
strict-transport-securitymax-age=63072000
content-security-policydefault-src 'self'; script-src 'report-sample' 'self' https://www.google-analytics.com/analytics.js https://www.googletagmanager.com/gtag/js assets.codepen.io production-assets.codepen.io https://js.stripe.com 'sha256-uogddBLIKmJa413dyT0iPejBg3VFcO+4x6B+vw3jng0=' 'sha256-EehWlTYp7Bqy57gDeQttaWKp0ukTTEUKGP44h8GVeik='; script-src-elem 'report-sample' 'self' https://www.google-analytics.com/analytics.js https://www.googletagmanager.com/gtag/js assets.codepen.io production-assets.codepen.io https://js.stripe.com 'sha256-uogddBLIKmJa413dyT0iPejBg3VFcO+4x6B+vw3jng0=' 'sha256-EehWlTYp7Bqy57gDeQttaWKp0ukTTEUKGP44h8GVeik='; style-src 'report-sample' 'self' 'unsafe-inline'; object-src 'none'; base-uri 'self'; connect-src 'self' developer.allizom.org bcd.developer.allizom.org bcd.developer.mozilla.org updates.developer.allizom.org updates.developer.mozilla.org https://*.google-analytics.com https://*.analytics.google.com https://*.googletagmanager.com stats.g.doubleclick.net https://api.stripe.com; font-src 'self'; frame-src 'self' interactive-examples.mdn.mozilla.net interactive-examples.mdn.allizom.net mdn.github.io live-samples.mdn.mozilla.net live-samples.mdn.allizom.net live-samples.developer.allizom.xyz *.mdnplay.dev *.mdnyalp.dev jsfiddle.net www.youtube-nocookie.com codepen.io survey.alchemer.com https://js.stripe.com; img-src 'self' *.githubusercontent.com *.googleusercontent.com *.gravatar.com mozillausercontent.com firefoxusercontent.com profile.stage.mozaws.net profile.accounts.firefox.com mdn.dev interactive-examples.mdn.mozilla.net interactive-examples.mdn.allizom.net wikipedia.org upload.wikimedia.org https://mdn.github.io/shared-assets/ https://*.google-analytics.com https://*.googletagmanager.com www.gstatic.com; manifest-src 'self'; media-src 'self' archive.org videos.cdn.mozilla.net https://mdn.github.io/shared-assets/; child-src 'self'; worker-src 'self';
x-frame-optionsDENY
x-cloud-trace-context206ee04117dba3e06b98ac756f0a0369
dateSat, 01 Jun 2024 06:51:55 GMT
serverGoogle Frontend
via1.1 google
varyAccept-Encoding
content-encodinggzip
x-cachemiss
statuscode200
http_versionHTTP/2

External factors

Blacklists
(Nice to have)
This website is not classified "for adult only".
This page is referenced by wikipedia.
This website has excellent links from other websites.
This page has backlinks from 107 referring domains.
This page has 26,008 backlinks.
This page has backlinks from 92 different ip addresses.
Facebook popularity
(Somewhat important)
The page has 0 shares and comments on Facebook.

Links from Wikipedia

You can find more links using Wikipedia search

Robots.txt

User-agent: *
Sitemap: https://developer.mozilla.org/sitemap.xml

Disallow: /api/
Disallow: /*/files/
Disallow: /media

Similar sites

Search preview

developer.mozilla.org
MDN Web Docs
The MDN Web Docs site provides information about Open Web technologies including HTML, CSS, and APIs for both Web sites and progressive web apps.

Most important keywords

Following keywords were found. You can check the keyword optimization of this page for each keyword.

KeywordResultRecheck
MDN63%Check
Web62%Check
MDN Web62%Check
MDN Web Docs61%Check
Developer60%Check
Docs58%Check
Web Resources56%Check
Web Technologies54%Check
Web APIs54%Check
developers52%Check
Show more keywords and terms

Test up to 1.000 webpages of developer.mozilla.org with our free plan!

Try For Free
No trial. It's just free!

Cookie Policy

We use cookies to make our site work and also for analytics and advertising purposes. You can enable or disable optional cookies as desired. See the following links for more information.

Contact | Privacy

We need these so the site can function properly

So we can better understand how visitors use our website

So we can serve you tailored ads and promotions