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Web Frameworks

90 coursera.org Last Updated: 1 year

Success 62% of passed verification steps

Warning 23% of total warning

Errors 15% of total errors, require fast action

Mobile

Performance Desktop Score 61%

Best Practices Desktop Score 92%

SEO Desktop Score 91%

Progressive Web App Desktop Score 31%

Performance Mobile Score 31%

Best Practices Mobile Score 92%

SEO Mobile Score 92%

Progressive Web App Mobile Score 33%

Page Authority Authority 66%

Domain Authority Domain Authority 92%

Moz Rank 6.6/10

Bounce Rate Rate 0%

Charset Encoding

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

Title Tag 75 Characters

COURSERA | ONLINE COURSES & CREDENTIALS BY TOP EDUCATORS. JOIN FOR FREE

Meta Description 312 Characters

Learn online and earn credentials from top universities like Yale, Michigan, Stanford, and leading companies like Google and IBM. Join Coursera for free and transform your career with degrees, certificates, Specializations, & MOOCs in data science, computer science, business, and dozens of other topics.

Effective URL 24 Characters

https://www.coursera.org

Excerpt Page content

Coursera | Online Courses & Credentials by Top Educators. Join for Free ListExploreFor EnterpriseJoin for FreeLog InLoupe CopyExploreArts and HumanitiesBusinessComputer ScienceData ScienceInformation TechnologyHealthMath and LogicPersonal De...

Keywords Cloud Density

coursera15 certificate11 skills10 learning10 business10 professional9 science7 online7 university7 they6

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

Keyword	Freq	Title	Desc	Domain	H1	H2
coursera	15
certificate	11
skills	10
learning	10
business	10
professional	9
science	7
online	7
university	7
they	6

Google Preview Your look like this in google search result

COURSERA | ONLINE COURSES & CREDENTIALS BY TOP EDUCATORS

https://www.coursera.org

Learn online and earn credentials from top universities like Yale, Michigan, Stanford, and leading companies like Google and IBM. Join Coursera for fr

Robots.txt File Detected

http://coursera.org/robots.txt

Sitemap.xml File Detected

http://coursera.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: 2013-07-02 / 8 years

Create on: 2012-01-12 / 9 years

Expires on: 2023-01-12 / 23 months 27 days

GoDaddy.com, LLC ,US

Registrar Whois Server: whois.godaddy.com

Registrar URL: http://www.whois.godaddy.com

Nameservers

NS-1481.AWSDNS-57.ORG

NS-1590.AWSDNS-06.CO.UK

NS-258.AWSDNS-32.COM

NS-688.AWSDNS-22.NET

Page Size Code & Text Ratio

Document Size: ~434.17 KB

Code Size: ~201.16 KB

Text Size: ~233.01 KB Ratio: 53.67%

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

Keep request counts low and transfer sizes small 182 requests • 2,302 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 31 resources found

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

Max Potential First Input Delay 470 ms

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

Time to Interactive 4.6 s

Time to interactive is the amount of time it takes for the page to become fully interactive

Links do not have descriptive text 1 link found

Descriptive link text helps search engines understand your content

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 20.1 s

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

Estimated Input Latency 100 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 72 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

User Timing marks and measures 23 user timings

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

Reduce server response times (TTFB) Root document took 790 ms

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

Eliminate render-blocking resources Potential savings of 250 ms

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

Enable text compression Potential savings of 28 KB

Text-based resources should be served with compression (gzip, deflate or brotli) to minimize total network bytes

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 350 ms

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

Reduce JavaScript execution time 1.5 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 318 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

Properly size images Potential savings of 12 KB

Serve images that are appropriately-sized to save cellular data and improve load time

Speed Index 2.7 s

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

First CPU Idle 3.5 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 2,302 KB

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

Minimize main-thread work 2.2 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

Avoid chaining critical requests 4 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 664 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 4 KB

Minifying JavaScript files can reduce payload sizes and script parse time

First Meaningful Paint 0.8 s

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

Mobile

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

Defer offscreen images Potential savings of 1,162 KB

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

Properly size images Potential savings of 7 KB

Serve images that are appropriately-sized to save cellular data and improve load time

Speed Index 13.0 s

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

First CPU Idle 5.5 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).

Avoid enormous network payloads Total size was 3,220 KB

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

Minimize main-thread work 8.4 s

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

First Contentful Paint 2.9 s

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

Avoid chaining critical requests 3 chains found

Avoids an excessive DOM size 597 elements

Minify JavaScript Potential savings of 4 KB

Minifying JavaScript files can reduce payload sizes and script parse time

First Meaningful Paint 2.9 s

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

Keep request counts low and transfer sizes small 184 requests • 3,220 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 31 resources found

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

Max Potential First Input Delay 1,650 ms

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

Time to Interactive 22.3 s

Time to interactive is the amount of time it takes for the page to become fully interactive

Links do not have descriptive text 1 link found

Descriptive link text helps search engines understand your content

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 22.3 s

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

First Contentful Paint (3G) 5790 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 930 ms

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 100% 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 73 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 136 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 23 user timings

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 580 ms

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

Eliminate render-blocking resources Potential savings of 660 ms

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

Enable text compression Potential savings of 28 KB

Text-based resources should be served with compression (gzip, deflate or brotli) to minimize total network bytes

Minimize third-party usage Third-party code blocked the main thread for 150 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 1,820 ms

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

Reduce JavaScript execution time 6.0 s

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

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/1.1 200 OK
Content-Type: text/html
Content-Length: 0
Connection: keep-alive
Cache-Control: private, no-cache, no-store, must-revalidate, max-age=0
Date: Thu, 26 Dec 2019 06:00:54 GMT
etag: W/"5e992-mIPtpZJSZF5uqfOr7hPF0UDR1UQ"
Server: envoy
Set-Cookie: CSRF3-Token=1578204054.y6Qw3ButbCc2ZVqJ; Max-Age=864000; Expires=Sun, 05 Jan 2020 06:00:54 GMT; Path=/; Domain=.coursera.org
Set-Cookie: __204u=6420878883-1577340054255; Max-Age=31536000; Expires=Fri, 25 Dec 2020 06:00:54 GMT; Path=/; Domain=.coursera.org
Strict-Transport-Security: max-age=31536000; includeSubDomains; preload
X-Content-Type-Options: nosniff
x-coursera-render-mode: html
x-coursera-render-version: v2
X-Coursera-Request-Id: E75YaielEeqNnhLD3DzQwQ
X-Coursera-Trace-Id-Hex: 3874aa5547d7aba2
x-envoy-upstream-service-time: 499
X-Frame-Options: SAMEORIGIN
x-powered-by: Express
X-XSS-Protection: 1; mode=block
X-Cache: Miss from cloudfront
Via: 1.1 836d15812518886911b1ae2be813f462.cloudfront.net (CloudFront)
X-Amz-Cf-Pop: IAD79-C1
X-Amz-Cf-Id: BHH7II9_4NX_8oVp5ll9VNwtv-3sN8DIM48Q9WA3DT748ToMN3udgA==

DNS Records DNS Resource Records associated with a hostname

View DNS Records

Type	Name	Value	Class	TTL
A	coursera.org	99.84.216.2	IN	4
A	coursera.org	99.84.216.116	IN	4
A	coursera.org	99.84.216.107	IN	4
A	coursera.org	99.84.216.96	IN	4
NS	coursera.org	ns-688.awsdns-22.net	IN	7174
NS	coursera.org	ns-1481.awsdns-57.org	IN	7174
NS	coursera.org	ns-1590.awsdns-06.co.uk	IN	7174
NS	coursera.org	ns-258.awsdns-32.com	IN	7174
MX	coursera.org	alt2.aspmx.l.google.com	IN	300
MX	coursera.org	aspmx.l.google.com	IN	300
MX	coursera.org	aspmx4.googlemail.com	IN	300
MX	coursera.org	aspmx3.googlemail.com	IN	300
MX	coursera.org	aspmx2.googlemail.com	IN	300
MX	coursera.org	alt1.aspmx.l.google.com	IN	300
MX	coursera.org	aspmx5.googlemail.com	IN	300
TXT	coursera.org	atlassian-domain-verification=OwoxnU5JeeEeNB3PXqTmPOsZNFUYTd05tar4PX8ZNNjps+mMWto+OyyA/50W5+B1	IN	60
TXT	coursera.org	google-site-verification=61uiBFuqY-MYJHWt_8qbU00Rsn7Nq_njU5eMUG0NlrY	IN	60
TXT	coursera.org	v=spf1 include:sendgrid.net ip4:24.6.102.21 ip4:54.83.204.127 ip4:50.16.53.44 include:_spf.google.com include:mail.focal360.com include:amazonses.com include:spf.mtasv.net -all	IN	60
TXT	coursera.org	google-site-verification=874wxzrE4FAJO81XTCXyH6WYnWZAMdlbMRXI3lfI0bw	IN	60
TXT	coursera.org	google-site-verification=tbpsWy5oBEvo-Kod36Lqsb3qRK0h_divcCGAeUdVZlk	IN	60
TXT	coursera.org	google-site-verification=UGpuPtZLCcMKFmgAeN4q6EbvxJn56A8Jz0sgW3yVKmA	IN	60
TXT	coursera.org	yandex-verification: 7472d03e746e191a	IN	60
TXT	coursera.org	MS=ms91657421	IN	60
TXT	coursera.org	spf2.0/pra include:amazonses.com include:sendgrid.net include:_spf.google.com include:spf.mtasv.net -all	IN	60
TXT	coursera.org	376174617-10056694	IN	60
TXT	coursera.org	google-site-verification=l-IugqqOHDGlHpUHfv3e6z8J1koLgfGSem04lqBA_B8	IN	60
TXT	coursera.org	docusign=05d7ee1b-a029-4b94-912a-25bb3c4a2bed	IN	60
TXT	coursera.org	atlassian-domain-verification=pwnyCbGEmC6E08lYJGO/SYkQvbjFS+OXy03eVMG75U52Edj0vbZGBjdaorxh+PUE	IN	60

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