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20 ck12.org Last Updated: 2 years

Success 55% of passed verification steps

Warning 15% of total warning

Errors 30% of total errors, require fast action

Mobile

Performance Desktop Score 69%

Best Practices Desktop Score 85%

SEO Desktop Score 73%

Progressive Web App Desktop Score 31%

Performance Mobile Score 14%

Best Practices Mobile Score 85%

SEO Mobile Score 74%

Progressive Web App Mobile Score 33%

Page Authority Authority 52%

Domain Authority Domain Authority 66%

Moz Rank 5.2/10

Bounce Rate Rate 0%

Charset Encoding

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

Title Tag 46 Characters

WELCOME TO CK-12 FOUNDATION | CK-12 FOUNDATION

Meta Description 0 Characters

NO DATA

Effective URL 28 Characters

https://www.ck12.org/student

Excerpt Page content

Welcome to CK-12 Foundation | CK-12 Foundation ...

Keywords Cloud Density

please3 flexbooks®2 browser2 foundation2 flexbook®2 platform2 program2 wait2 overview2 enable2

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

Keyword	Freq	Title	Desc	Domain	H1	H2
please	3
flexbooks®	2
browser	2
foundation	2
flexbook®	2
platform	2
program	2
wait	2
overview	2
enable	2

Google Preview Your look like this in google search result

WELCOME TO CK-12 FOUNDATION | CK-12 FOUNDATION

https://www.ck12.org/student

Welcome to CK-12 Foundation | CK-12 Foundation ...

Robots.txt File Detected

http://ck12.org/robots.txt

Sitemap.xml File Detected

http://ck12.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: 2018-03-01 / 3 years

Create on: 2006-12-16 / 14 years

Expires on: 2022-12-16 / 18 months 9 days

Network Solutions, LLC ,US

Registrar Whois Server: whois.networksolutions.com

Registrar URL: http://www.networksolutions.com

Nameservers

NS-1136.AWSDNS-14.ORG

NS-161.AWSDNS-20.COM

NS-1687.AWSDNS-18.CO.UK

NS-977.AWSDNS-58.NET

Page Size Code & Text Ratio

Document Size: ~23.83 KB

Code Size: ~13.84 KB

Text Size: ~9.99 KB Ratio: 41.93%

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

Avoid enormous network payloads Total size was 3,160 KB

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

Minimize main-thread work 2.4 s

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

First Contentful Paint 1.1 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 3 vulnerabilities detected

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

Avoid chaining critical requests 16 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

Avoid an excessive DOM size 833 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)

Preload key requests Potential savings of 1,150 ms

Consider using `<link rel=preload>` to prioritize fetching resources that are currently requested later in page load

First Meaningful Paint 1.5 s

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

Keep request counts low and transfer sizes small 121 requests • 3,160 KB

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

Use video formats for animated content Potential savings of 448 KB

Large GIFs are inefficient for delivering animated content. Consider using MPEG4/WebM videos for animations and PNG/WebP for static images instead of GIF to save network bytes

Serve static assets with an efficient cache policy 51 resources found

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

Max Potential First Input Delay 170 ms

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

Time to Interactive 2.8 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 17.8 s

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

Estimated Input Latency 40 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 41 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 616 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

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 90 ms

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

Eliminate render-blocking resources Potential savings of 40 ms

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

Efficiently encode images Potential savings of 408 KB

Optimized images load faster and consume less cellular data

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 300 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 330 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 642 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 2.6 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).

Mobile

Serve images in next-gen formats Potential savings of 616 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

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 40 ms

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

Eliminate render-blocking resources Potential savings of 300 ms

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

Efficiently encode images Potential savings of 408 KB

Optimized images load faster and consume less cellular data

Reduce the impact of third-party code Third-party code blocked the main thread for 550 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 2,540 ms

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

Reduce JavaScript execution time 6.7 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

Defer offscreen images Potential savings of 1,764 KB

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

Speed Index 9.0 s

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

First CPU Idle 12.3 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 3,160 KB

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

Minimize main-thread work 9.0 s

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

First Contentful Paint 4.8 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 3 vulnerabilities detected

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

Avoid chaining critical requests 17 chains found

Avoid an excessive DOM size 831 elements

Preload key requests Potential savings of 1,470 ms

Consider using `<link rel=preload>` to prioritize fetching resources that are currently requested later in page load

First Meaningful Paint 6.7 s

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

Keep request counts low and transfer sizes small 120 requests • 3,160 KB

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

Use video formats for animated content Potential savings of 448 KB

Large GIFs are inefficient for delivering animated content. Consider using MPEG4/WebM videos for animations and PNG/WebP for static images instead of GIF to save network bytes

Serve static assets with an efficient cache policy 51 resources found

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

Max Potential First Input Delay 870 ms

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

Time to Interactive 17.4 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 17.4 s

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

Estimated Input Latency 440 ms

First Contentful Paint (3G) 9753 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 77% 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 96.54% 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 42 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

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/1.1 301 Moved Permanently
Content-Type: text/plain; charset=UTF-8
Connection: keep-alive
Date: Thu, 28 Nov 2019 06:33:19 GMT
Server: Apache/2.4.18 (Ubuntu)
Location: https://www.ck12.org/student/
Content-Encoding: gzip
P3P: CP="ALL DSP COR CURa OUR IND ONL COM NAV INT CNT STA PRE"
Access-Control-Allow-Headers: Content-Type, *
Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS
Access-Control-Allow-Credentials: true
Vary: Accept-Encoding
X-Cache: Hit from cloudfront
Via: 1.1 e257dc69f95c31210d80daf337acd889.cloudfront.net (CloudFront)
X-Amz-Cf-Pop: ORD50-C1
X-Amz-Cf-Id: 1fd8LQf3e9gC_Y36VK28HCGhCoDnjxboDshHZ04czb0MUeOg4KnmTQ==

DNS Records DNS Resource Records associated with a hostname

View DNS Records

Type	Name	Value	Class	TTL
A	ck12.org	107.22.233.201	IN	95
A	ck12.org	54.243.211.55	IN	95
NS	ck12.org	ns-977.awsdns-58.net	IN	7176
NS	ck12.org	ns-1687.awsdns-18.co.uk	IN	7176
NS	ck12.org	ns-161.awsdns-20.com	IN	7176
NS	ck12.org	ns-1136.awsdns-14.org	IN	7176
MX	ck12.org	aspmx5.aspmx.l.google.com	IN	95
MX	ck12.org	aspmx4.aspmx.l.google.com	IN	95
MX	ck12.org	aspmx2.aspmx.l.google.com	IN	95
MX	ck12.org	alt2.aspmx.l.google.com	IN	95
MX	ck12.org	alt1.aspmx.l.google.com	IN	95
MX	ck12.org	aspmx.l.google.com	IN	95
TXT	ck12.org	v=spf1 ip4:174.129.252.43 ip4:63.236.100.0/24 ip4:66.77.16.0/24 include:icpbounce.com include:amazonses.com include:_spf.google.com ~all	IN	95
AAAA	ck12.org	2600:1f18:357:2a01:938c:5085:b6c0:5c6d	IN	275
AAAA	ck12.org	2600:1f18:357:2a01:4146:aa25:d1d5:ae2c	IN	275

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20 ck12.org Last Updated: 2 years

Desktop

Mobile

Estimation Traffic and Earnings

Sign up for see all features and reviews about this site

Technologies

Amazon Cloudfront

Apache

Google Font API

Google Tag Manager

Ubuntu

ZURB Foundation

PWA - Manifest

Desktop

Mobile

Speed And Optimization Tips

Sign up for see all features and reviews about this site

Alexa Rank

0

Information Server

Comments