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87 edx.org Last Updated: 9 months

Success 78% of passed verification steps

Warning 15% of total warning

Errors 7% of total errors, require fast action

Mobile

Performance Desktop Score 91%

Best Practices Desktop Score 85%

SEO Desktop Score 100%

Progressive Web App Desktop Score 19%

Performance Mobile Score 38%

Best Practices Mobile Score 69%

SEO Mobile Score 97%

Progressive Web App Mobile Score 15%

Page Authority Authority 63%

Domain Authority Domain Authority 89%

Moz Rank 6.3/10

Bounce Rate Rate 0%

Charset Encoding

Great, language/character encoding is specified: UTF-8

Title Tag 49 Characters

EDX |--- ONLINE COURSES BY HARVARD, MIT, & MORE

Meta Description 138 Characters

Access 2000--- online courses from 140 leading institutions worldwide. Gain new skills and earn a certificate of completion. Join today.

Effective URL 19 Characters

https://www.edx.org

Excerpt Page content

edX |--- Online Courses by Harvard, MIT, & more Skip to main content

Meta Keywords 4 Detected

online classes MOOC --- courses college classes

Keywords Cloud Density

skip1 main1 content1

Keyword Consistency Keyword density is one of the main terms in SEO

Keyword	Freq	Title	Desc	Domain	H1	H2
skip	1
main	1
content	1

Google Preview Your look like this in google search result

EDX |--- ONLINE COURSES BY HARVARD, MIT, & MORE

https://www.edx.org

Access 2000--- online courses from 140 leading institutions worldwide. Gain new skills and earn a certificate of completion. Join today.

Robots.txt File Detected

http://edx.org/robots.txt

Sitemap.xml File Detected

http://edx.org/sitemap.xml

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: 2018-10-25 / 2 years

Create on: 2001-11-25 / 19 years

Expires on: 2019-11-25 / 8 months 21 days

Gandi SAS ,US

Registrar Whois Server: whois.gandi.net

Registrar URL: http://www.gandi.net

Nameservers

NS-1472.AWSDNS-56.ORG

NS-73.AWSDNS-09.COM

NS-1753.AWSDNS-27.CO.UK

NS-828.AWSDNS-39.NET

Page Size Code & Text Ratio

Document Size: ~17.91 KB

Code Size: ~15.24 KB

Text Size: ~2.67 KB Ratio: 14.91%

Estimation Traffic and Earnings

Only Registered Users

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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

Total Blocking Time 120 ms

Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds.

JavaScript execution time 0.6 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 1.4 s

Speed Index shows how quickly the contents of a page are visibly populated

First CPU Idle 1.7 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 1,284 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

First Contentful Paint 0.8 s

First Contentful Paint marks the time at which the first text or image is painted

Includes front-end JavaScript libraries with known security vulnerabilities 7 vulnerabilities detected

Some third-party scripts may contain known security vulnerabilities that are easily identified and exploited by attackers

Avoid chaining critical requests 21 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 324 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)

Minify JavaScript Potential savings of 6 KB

Minifying JavaScript files can reduce payload sizes and script parse time

First Meaningful Paint 1.3 s

First Meaningful Paint measures when the primary content of a page is visible

Keep request counts low and transfer sizes small 95 requests • 1,284 KB

To set budgets for the quantity and size of page resources, add a budget.json file

Serve static assets with an efficient cache policy 43 resources found

A long cache lifetime can speed up repeat visits to your page

Max Potential First Input Delay 120 ms

The maximum potential First Input Delay that your users could experience is the duration, in milliseconds, of the longest task

Time to Interactive 2.1 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

Page load is not fast enough on mobile networks Interactive on simulated mobile network at 14.4 s

A fast page load over a cellular network ensures a good mobile user experience

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 66 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

Serve images in next-gen formats Potential savings of 9 KB

Image formats like JPEG 2000, JPEG XR, and WebP often provide better compression than PNG or JPEG, which means faster downloads and less data consumption

User Timing marks and measures 1 user timing

Consider instrumenting your app with the User Timing API to measure your app's real-world performance during key user experiences

Server response times are low (TTFB) Root document took 70 ms

Time To First Byte identifies the time at which your server sends a response

Eliminate render-blocking resources Potential savings of 600 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 80 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

Mobile

Avoids enormous network payloads Total size was 1,279 KB

Large network payloads cost users real money and are highly correlated with long load times

Minimize main-thread work 7.9 s

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this

First Contentful Paint 3.3 s

First Contentful Paint marks the time at which the first text or image is painted

Includes front-end JavaScript libraries with known security vulnerabilities 7 vulnerabilities detected

Some third-party scripts may contain known security vulnerabilities that are easily identified and exploited by attackers

Avoid chaining critical requests 21 chains found

Avoids an excessive DOM size 318 elements

Minify JavaScript Potential savings of 6 KB

Minifying JavaScript files can reduce payload sizes and script parse time

First Meaningful Paint 5.5 s

First Meaningful Paint measures when the primary content of a page is visible

Keep request counts low and transfer sizes small 96 requests • 1,279 KB

To set budgets for the quantity and size of page resources, add a budget.json file

Serve static assets with an efficient cache policy 44 resources found

A long cache lifetime can speed up repeat visits to your page

Max Potential First Input Delay 600 ms

The maximum potential First Input Delay that your users could experience is the duration, in milliseconds, of the longest task

Time to Interactive 14.4 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

Page load is not fast enough on mobile networks Interactive at 14.4 s

A fast page load over a cellular network ensures a good mobile user experience

Estimated Input Latency 170 ms

First Contentful Paint (3G) 6287 ms

First Contentful Paint 3G marks the time at which the first text or image is painted while on a 3G network

Tap targets are not sized appropriately 66% 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 96% 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 68 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

Serve images in next-gen formats Potential savings of 42 KB

Image formats like JPEG 2000, JPEG XR, and WebP often provide better compression than PNG or JPEG, which means faster downloads and less data consumption

Does not use HTTPS 1 insecure request found

All sites should be protected with HTTPS, even ones that don't handle sensitive data. HTTPS prevents intruders from tampering with or passively listening in on the communications between your app and your users, and is a prerequisite for HTTP/2 and many new web platform APIs

User Timing marks and measures 1 user timing

Consider instrumenting your app with the User Timing API to measure your app's real-world performance during key user experiences

Server response times are low (TTFB) Root document took 60 ms

Time To First Byte identifies the time at which your server sends a response

Eliminate render-blocking resources Potential savings of 2,260 ms

Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles

Reduce the impact of third-party code Third-party code blocked the main thread for 1,570 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 2,700 ms

Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds.

Reduce JavaScript execution time 4.9 s

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this

Defer offscreen images Potential savings of 84 KB

Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive

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 5.0 s

Speed Index shows how quickly the contents of a page are visibly populated

First CPU Idle 10.1 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).

Speed And Optimization Tips

Only Registered Users

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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/1.1 200 OK
Date: Tue, 26 Nov 2019 21:15:40 GMT
Content-Type: text/html; charset=utf-8
Connection: keep-alive
Set-Cookie: __cfduid=d3843d10d2b3d2f1dfb0cff63650d60e01574802940; expires=Thu, 26-Dec-19 21:15:40 GMT; path=/; domain=.edx.org; HttpOnly
CF-Ray: 53bee10b2abdc518-ORD
CF-Cache-Status: HIT
Cache-Control: s-maxage=300, max-age=0, must-revalidate
Age: 787
Content-Language: en
Expires: Sun, 19 Nov 1978 05:00:00 GMT
Last-Modified: Tue, 26 Nov 2019 21:02:23 GMT
Set-Cookie: prod-edx-cf-loc=US; Path=/; Expires=Thu, 26 Nov 2020 21:15:40 GMT
Strict-Transport-Security: max-age=2592000
Vary: X-Accept-Language,Accept-Encoding
Via: varnish
Expect-CT: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
X-AH-Environment: prod
X-Cache: HIT
X-Cache-Hits: 3
X-Content-Type-Options: nosniff
X-Drupal-Cache: MISS
X-Frame-Options: SameOrigin
X-Generator: Drupal 7 (http://drupal.org)
X-Request-ID: v-0aeabb04-1090-11ea-9c81-e70550aee825
Server: cloudflare
Content-Encoding: gzip

DNS Records DNS Resource Records associated with a hostname

View DNS Records

Type	Name	Value	Class	TTL
A	edx.org	99.84.251.110	IN	42
A	edx.org	99.84.251.35	IN	42
A	edx.org	99.84.251.62	IN	42
A	edx.org	99.84.251.54	IN	42
NS	edx.org	ns-828.awsdns-39.net	IN	7183
NS	edx.org	ns-73.awsdns-09.com	IN	7183
NS	edx.org	ns-1753.awsdns-27.co.uk	IN	7183
NS	edx.org	ns-1472.awsdns-56.org	IN	7183
MX	edx.org	alt2.aspmx.l.google.com	IN	12
MX	edx.org	alt1.aspmx.l.google.com	IN	12
MX	edx.org	ms19207554.msv1.invalid	IN	12
MX	edx.org	aspmx2.googlemail.com	IN	12
MX	edx.org	aspmx.l.google.com	IN	12
TXT	edx.org	v=spf1 include:_spf.google.com include:mail.zendesk.com include:servers.mcsv.net include:aspmx.sailthru.com include:spf1.mailgun.org include:spf2.mailgun.org ip4:23.239.13.15 ip6:2600:3c03::f03c:91ff:fe98:9a08 -all	IN	282
TXT	edx.org	segment-site-verification=2ZGPEbxZ025BzXh516qCWeQ7sGFFltDx	IN	282
TXT	edx.org	google-site-verification=VmJhKMomzXGRq96pOMWst3QD0KvnurTNsPHNhv8qt1k	IN	282
TXT	edx.org	google-site-verification=3wMRITKQ9E2388ON5mfWt98s48OBDMVzPO-7xY3U6H4	IN	282
TXT	edx.org	facebook-domain-verification=h2gg5zwnyax0dj0jyo4aafdtkpiiyu	IN	282
TXT	edx.org	atlassian-domain-verification=xpq-aB5aXpxCKMr7r3eDPHyz+H8uPB16jIppdmlCIloVrhEtCrKucpx/Nnqr1xJg	IN	282
TXT	edx.org	amazonses:0rz9BauM6+L1fwnDKUmS4nofo+8gZvTReGo5q/EliHY=	IN	282
TXT	edx.org	adobe-idp-site-verification=3f2215d19f499a970c4305a59755a6a1eb0f9850d7777a297a46db1e644e71c7	IN	282

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87 edx.org Last Updated: 9 months

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Alexa Rank

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Information Server

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