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95 developer.mozilla.org Last Updated: 7 months

Success 47% of passed verification steps
Warning 30% of total warning
Errors 23% of total errors, require fast action

Desktop

Mobile

Performance Desktop Score 97%
Best Practices Desktop Score 100%
SEO Desktop Score 89%
Progressive Web App Desktop Score 58%
Performance Mobile Score 88%
Best Practices Mobile Score 100%
SEO Mobile Score 91%
Progressive Web App Mobile Score 59%
Page Authority Authority 76%
Domain Authority Domain Authority 97%
Moz Rank 7.6/10
Bounce Rate Rate 0%
Charset Encoding
Great, language/character encoding is specified: UTF-8
Title Tag 12 Characters
MDN WEB DOCS
Meta Description 250 Characters
The MDN Web Docs site provides information about Open Web technologies including HTML, CSS, and APIs for both Web sites and progressive web apps. It also has some developer-oriented documentation for Mozilla products, such as Firefox Developer Tools.
Effective URL 35 Characters
https://developer.mozilla.org/en-US
Excerpt Page content
MDN Web Docs Skip to main contentS...
Google Preview Your look like this in google search result
MDN WEB DOCS
https://developer.mozilla.org/en-US
The MDN Web Docs site provides information about Open Web technologies including HTML, CSS, and APIs for both Web sites and progressive web apps. It a
Robots.txt File No Found
Sitemap.xml File No Found
Whois Is a query and response protocol that is widely used for querying databases that store the registered users or assignees of an Internet resource, such as a domain name, an IP address block, or an autonomous system
Updated: 2018-12-22 / 2 years
Create on: 1998-01-24 / 23 years
Expires on: 2021-01-23 / 1 months 19 days

MarkMonitor Inc. ,US
Registrar Whois Server: whois.markmonitor.com
Registrar URL: http://www.markmonitor.com

Nameservers
NS5-65.AKAM.NET
NS7-66.AKAM.NET
NS4-64.AKAM.NET
NS1-240.AKAM.NET
Page Size Code & Text Ratio
Document Size: ~17.69 KB
Code Size: ~13.92 KB
Text Size: ~3.77 KB Ratio: 21.31%

Estimation Traffic and Earnings

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Technologies

PWA - Manifest

Manifest is not valid
Your site don't have valid manifest.json, read more in Web App Manifest

Desktop

Desktop Screenshot
Uses efficient cache policy on static assets 2 resources found
A long cache lifetime can speed up repeat visits to your page
Max Potential First Input Delay 30 ms
The maximum potential First Input Delay that your users could experience is the duration, in milliseconds, of the longest task
Time to Interactive 0.9 s
Time to interactive is the amount of time it takes for the page to become fully interactive
Network Round Trip Times 0 ms
Network round trip times (RTT) have a large impact on performance. If the RTT to an origin is high, it's an indication that servers closer to the user could improve performance
Estimated Input Latency 10 ms
Estimated Input Latency is an estimate of how long your app takes to respond to user input, in milliseconds, during the busiest 5s window of page load. If your latency is higher than 50 ms, users may perceive your app as laggy
Remove unused CSS Potential savings of 31 KB
Remove dead rules from stylesheets and defer the loading of CSS not used for above-the-fold content to reduce unnecessary bytes consumed by network activity
Avoid multiple page redirects Potential savings of 230 ms
Redirects introduce additional delays before the page can be loaded
Server response times are low (TTFB) Root document took 250 ms
Time To First Byte identifies the time at which your server sends a response
Eliminate render-blocking resources Potential savings of 440 ms
Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles
Minimize third-party usage Third-party code blocked the main thread for 0 ms
Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading
Total Blocking Time 0 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds.
JavaScript execution time 0.0 s
Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this
Server Backend Latencies 0 ms
Server latencies can impact web performance. If the server latency of an origin is high, it's an indication the server is overloaded or has poor backend performance
Speed Index 0.9 s
Speed Index shows how quickly the contents of a page are visibly populated
First CPU Idle 0.9 s
First CPU Idle marks the first time at which the page's main thread is quiet enough to handle input. [Learn more](https://web.dev/first-cpu-idle).
Avoids enormous network payloads Total size was 339 KB
Large network payloads cost users real money and are highly correlated with long load times
robots.txt is not valid 19 errors found
If your robots.txt file is malformed, crawlers may not be able to understand how you want your website to be crawled or indexed
Minimizes main-thread work 0.3 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this
First Contentful Paint 0.9 s
First Contentful Paint marks the time at which the first text or image is painted
Avoid chaining critical requests 10 chains found
The Critical Request Chains below show you what resources are loaded with a high priority. Consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load
Avoids an excessive DOM size 305 elements
A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow)
First Meaningful Paint 0.9 s
First Meaningful Paint measures when the primary content of a page is visible
Keep request counts low and transfer sizes small 28 requests • 339 KB
To set budgets for the quantity and size of page resources, add a budget.json file

Mobile

Mobile Screenshot
First Meaningful Paint 2.8 s
First Meaningful Paint measures when the primary content of a page is visible
Keep request counts low and transfer sizes small 27 requests • 327 KB
To set budgets for the quantity and size of page resources, add a budget.json file
Uses efficient cache policy on static assets 2 resources found
A long cache lifetime can speed up repeat visits to your page
Max Potential First Input Delay 190 ms
The maximum potential First Input Delay that your users could experience is the duration, in milliseconds, of the longest task
Time to Interactive 4.3 s
Time to interactive is the amount of time it takes for the page to become fully interactive
Network Round Trip Times 0 ms
Network round trip times (RTT) have a large impact on performance. If the RTT to an origin is high, it's an indication that servers closer to the user could improve performance
First Contentful Paint (3G) 5229 ms
First Contentful Paint 3G marks the time at which the first text or image is painted while on a 3G network
Estimated Input Latency 10 ms
Estimated Input Latency is an estimate of how long your app takes to respond to user input, in milliseconds, during the busiest 5s window of page load. If your latency is higher than 50 ms, users may perceive your app as laggy
Tap targets are sized appropriately 100% appropriately sized tap targets
Interactive elements like buttons and links should be large enough (48x48px), and have enough space around them, to be easy enough to tap without overlapping onto other elements
Document uses legible font sizes 99.76% legible text
Font sizes less than 12px are too small to be legible and require mobile visitors to “pinch to zoom” in order to read. Strive to have >60% of page text ≥12px
Remove unused CSS Potential savings of 32 KB
Remove dead rules from stylesheets and defer the loading of CSS not used for above-the-fold content to reduce unnecessary bytes consumed by network activity
Avoid multiple page redirects Potential savings of 780 ms
Redirects introduce additional delays before the page can be loaded
Server response times are low (TTFB) Root document took 20 ms
Time To First Byte identifies the time at which your server sends a response
Eliminate render-blocking resources Potential savings of 910 ms
Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles
Minimize third-party usage Third-party code blocked the main thread for 60 ms
Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading
Total Blocking Time 70 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds.
JavaScript execution time 0.3 s
Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this
Server Backend Latencies 0 ms
Server latencies can impact web performance. If the server latency of an origin is high, it's an indication the server is overloaded or has poor backend performance
Speed Index 2.8 s
Speed Index shows how quickly the contents of a page are visibly populated
First CPU Idle 3.4 s
First CPU Idle marks the first time at which the page's main thread is quiet enough to handle input. [Learn more](https://web.dev/first-cpu-idle).
Avoids enormous network payloads Total size was 327 KB
Large network payloads cost users real money and are highly correlated with long load times
Minimizes main-thread work 1.4 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this
robots.txt is not valid 19 errors found
If your robots.txt file is malformed, crawlers may not be able to understand how you want your website to be crawled or indexed
First Contentful Paint 2.8 s
First Contentful Paint marks the time at which the first text or image is painted
Avoid chaining critical requests 10 chains found
The Critical Request Chains below show you what resources are loaded with a high priority. Consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load
Avoids an excessive DOM size 305 elements
A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow)

Speed And Optimization Tips

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Alexa Rank

0

Local Rank: / Users: / PageViews:

Global Rank

Information Server

Response Header HTTP headers carry information about the client browser, the requested page and the server
HTTP/1.1 301 Moved Permanently
Content-Type: text/html; charset=utf-8
Content-Length: 0
Connection: keep-alive
Content-Language: en-US
Date: Tue, 21 Apr 2020 09:06:56 GMT
ETag: "d41d8cd98f00b204e9800998ecf8427e"
Location: /en-US/
Server: meinheld/1.0.1
Strict-Transport-Security: max-age=63072000
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Vary: Cookie
X-Cache: Hit from cloudfront
Via: 1.1 96a64fa2174f29526cca2286fa3d1340.cloudfront.net (CloudFront)
X-Amz-Cf-Pop: EWR52-C4
X-Amz-Cf-Id: FwAn4QeGzv7hoEGElm3sMEAjotBgqa1g4qjYOuDWPjJbzqwog7N8IA==
Age: 6789
DNS Records DNS Resource Records associated with a hostname
View DNS Records

Comments

Add extension to Chrome