Report for www.ck12.org

Overall8.5

The overall score for this website.

Accessibility8.6

How accessible the website is to mobile and disabled users.

The following tests contribute to this score:

Experience9.3

How satisfying the website is likely to be for users.

Marketing8.9

How well marketed, and popular the website is.

Technology8.6

How well designed and built the website is.

Screenshot of www.ck12.org

Nibbler tested a sample of 5 pages from this website at 15:52 on 29 Apr 2020 (BST).

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Top priorities for website improvement

  • Add meaningful anchor text that describes the link's destination. If the link contains an image, ensure you have provided alt text. (read more)
  • Make sure that all the pages of this website include a meta description. If you don't include one, Google will choose a sample of text from the page to appear in the search engine result. By including a meta description, you can control how your search engine result will appear. (read more)
  • Make sure all headings have content which is relevant to the page of content. (read more)

Meta tags3.6

  • All pages include at least some metadata, but only 20.0% of pages have a description meta tag. The description meta data is important as it appears on Google's search result pages.

Meta Tags (name attribute)

Page URLNameContent
www.ck12.org/student/authorCK-12 Foundation
www.ck12.org/student/viewportwidth=device-width
www.ck12.org/student/google-site-verificationwHx0f-Udlfd7ZNYNrIXpJVpjjO8nSH5RE0jIX8V-jIM
www.ck12.org/student/google-translate-customization
www.ck12.org/student/application-nameCK-12 Foundation
www.ck12.org/student/msapplication-tilecolor#003300
www.ck12.org/student/msapplication-tileimage//img1.ck12.org/media/build-20200428180044/images/ck12-logo-livetile.png
www.ck12.org/college/authorCK-12 Foundation
www.ck12.org/college/viewportwidth=device-width
www.ck12.org/college/google-site-verificationwHx0f-Udlfd7ZNYNrIXpJVpjjO8nSH5RE0jIX8V-jIM
www.ck12.org/college/google-translate-customization
www.ck12.org/college/application-nameCK-12 Foundation
www.ck12.org/college/msapplication-tilecolor#003300
www.ck12.org/college/msapplication-tileimage//img1.ck12.org/media/build-20200428180044/images/ck12-logo-livetile.png
www.ck12.org/nojavascript/viewportwidth=device-width, initial-scale=1.0
www.ck12.org/nojavascript/google-site-verificationwHx0f-Udlfd7ZNYNrIXpJVpjjO8nSH5RE0jIX8V-jIM
www.ck12.org/nojavascript/google-translate-customization
www.ck12.org/nojavascript/authorCK-12 Foundation
www.ck12.org/nojavascript/robotsnoindex
www.ck12.org/nojavascript/application-nameCK-12 Foundation
www.ck12.org/nojavascript/msapplication-tilecolor#003300
www.ck12.org/nojavascript/msapplication-tileimage//img1.ck12.org/media/build-20200428180044/images/ck12-logo-livetile.png
www.ck12.org/nocookies/viewportwidth=device-width, initial-scale=1.0
www.ck12.org/nocookies/google-site-verificationwHx0f-Udlfd7ZNYNrIXpJVpjjO8nSH5RE0jIX8V-jIM
www.ck12.org/nocookies/google-translate-customization
www.ck12.org/nocookies/authorCK-12 Foundation
www.ck12.org/nocookies/robotsnoindex
www.ck12.org/nocookies/application-nameCK-12 Foundation
www.ck12.org/nocookies/msapplication-tilecolor#003300
www.ck12.org/nocookies/msapplication-tileimage//img1.ck12.org/media/build-20200428180044/images/ck12-logo-livetile.png
www.ck12.org/earth-science/.../authorCK-12 Foundation
www.ck12.org/earth-science/.../titleSeasons ( Read ) | Earth Science
www.ck12.org/earth-science/.../descriptionDescribes how and why seasons occur.
www.ck12.org/earth-science/.../google-play-appapp-id=org.ck12.app.practice
www.ck12.org/earth-science/.../apple-itunes-app-internalapp-id=909343639
www.ck12.org/earth-science/.../viewportwidth=device-width
www.ck12.org/earth-science/.../google-site-verificationwHx0f-Udlfd7ZNYNrIXpJVpjjO8nSH5RE0jIX8V-jIM
www.ck12.org/earth-science/.../google-translate-customization
www.ck12.org/earth-science/.../application-nameCK-12 Foundation
www.ck12.org/earth-science/.../msapplication-tilecolor#003300
www.ck12.org/earth-science/.../msapplication-tileimage//img1.ck12.org/media/build-20200428180044/images/ck12-logo-livetile.png

Meta Tags (http-equiv attribute)

Page URLNameContent
www.ck12.org/student/x-dns-prefetch-controlon
www.ck12.org/college/x-dns-prefetch-controlon
www.ck12.org/nojavascript/X-UA-CompatibleIE=edge,chrome=1
www.ck12.org/nojavascript/x-dns-prefetch-controlon
www.ck12.org/nocookies/X-UA-CompatibleIE=edge,chrome=1
www.ck12.org/nocookies/x-dns-prefetch-controlon
www.ck12.org/earth-science/.../x-dns-prefetch-controlon

Headings5.8

apple attributions axial browser chrome concept cookies created date describes description details difficulty earth's enabled equinoxes explorer firefox google grades highlights image internet javascript last learning level modified mozilla nodes notes objectives overview requires resources result safari seasons showhide shows site solstices tilt vocabulary

  • All pages were found to use defined headings. This is excellent as it allows visitors and search engines to summarise the content of webpages quickly. Correctly defined headings aid accessibility and are particularly important for search engine optimisation.
  • Some headings (3.0%) were found to be empty, or incorrectly defined. Empty or invalid headings are of no value to search engines and make a website less accessible.
    • Make sure all headings have content which is relevant to the page of content.
  • Some pages did not define headings correctly. The H1 tag should be used for the most top-level heading, with H2 being used for sub-headings and H3 for further sub-headings and so-on. Not conforming to this convention may confuse visitors.
    • Ensure that headings are defined in a semantically correct way, i.e. always start with a H1 tag. This is used to summarise the page content. Further tags (H2, H3, H4 etc) are meant to summarise and partition sections within the content.

Page headings detail

URLHeadingLevel
www.ck12.org/student/CK-12 OverviewH4
www.ck12.org/college/CK-12 OverviewH4
www.ck12.org/nojavascript/Our site requires Javascript to be enabled.H2
www.ck12.org/nojavascript/Internet Explorer (6.0 & 7.0)H2
www.ck12.org/nojavascript/Mozilla Firefox (1.5+ & Up)H2
www.ck12.org/nojavascript/Google ChromeH2
www.ck12.org/nojavascript/Apple SafariH2
www.ck12.org/nojavascript/CK-12 OverviewH4
www.ck12.org/nocookies/Our site requires browser cookies to be enabled.H2
www.ck12.org/nocookies/Internet Explorer (6.0 & 7.0)H2
www.ck12.org/nocookies/Mozilla Firefox (1.5+ & Up)H2
www.ck12.org/nocookies/Google ChromeH2
www.ck12.org/nocookies/Apple SafariH2
www.ck12.org/nocookies/CK-12 OverviewH4
www.ck12.org/earth-science/.../SeasonsH1
www.ck12.org/earth-science/.../Shows how seasons are the result of Earth's axial tilt and describes solstices and equinoxes.H2
www.ck12.org/earth-science/.../DescriptionH2
www.ck12.org/earth-science/.../Learning ObjectivesH2
www.ck12.org/earth-science/.../VocabularyH2
www.ck12.org/earth-science/.../Difficulty LevelH2
www.ck12.org/earth-science/.../GradesH2
www.ck12.org/earth-science/.../Date Created:H2
www.ck12.org/earth-science/.../Last Modified:H2
www.ck12.org/earth-science/.../Concept Nodes:H2
www.ck12.org/earth-science/.../Notes/HighlightsH3
www.ck12.org/earth-science/.../Image AttributionsH3
www.ck12.org/earth-science/.../ShowHide DetailsH3
www.ck12.org/earth-science/.../ShowHide ResourcesH3
www.ck12.org/earth-science/.../CK-12 OverviewH4

Amount of content7.0

Rendering Chart...

  • This website has an average of 218 words per page. The amount of content on a website has been shown to correlate with its search engine ranking.
    • Consider the amount of text on this website and increase it if appropriate.

Images8.9

57% of images have a clearly defined size

16 images are being resized by the browser

Server behaviour9.4

Yes404 page

YesCompression

  • This website handles missing pages correctly by sending a 404 HTTP status code.
  • This website was served with GZIP encoding. This is very good because it reduces the loading time of a web page.
  • This website follows the best practice of using a permanent (HTTP 301) redirect between URLs with/without trailing slashes. This is ideal.
  • This website uses a temporary (HTTP 302) redirect from http://ck12.org to http://www.ck12.org. This is OK, but a permanent (HTTP 301) redirect is considered best practice.
    • If possible, change the temporary redirect to a permanent (HTTP 301) redirect.

Twitter10.0

This website is linked with the Twitter account @CK12Foundation

This website's Twitter account has
66,869 followers

  • This website was found to link the Twitter account CK-12 Foundation (@CK12Foundation).
  • This website's Twitter account has made 7,188 tweets to 66,869 followers.

Source: Twitter

Mobile10.0

Mobile screenshot of www.ck12.orgTablet screenshot of www.ck12.org
  • All of this website appears to be optimised for viewing on a mobile phone or a tablet.

Media specific CSS detected

MediaMin widthMax widthCSS file
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all-767pxst3.ck12.org/media/.../content.css
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all768px-st2.ck12.org/media/.../tangerine-ui.css
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all768px1023pxst2.ck12.org/media/.../tangerine-ui.css
all900px1023pxst2.ck12.org/media/.../tangerine-ui.css
all768px-st2.ck12.org/media/.../tangerine-ui.css
all1024px1440pxst2.ck12.org/media/.../tangerine-ui.css
all1280px-st2.ck12.org/media/.../tangerine-ui.css
all320px400pxst2.ck12.org/media/.../tangerine-ui.css
only screen1025px-st2.ck12.org/media/.../tangerine-ui.css
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all768px899pxst1.ck12.org/media/.../master.css
all768px1023pxst1.ck12.org/media/.../master.css
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all768px-st1.ck12.org/media/.../master.css
all1024px1440pxst1.ck12.org/media/.../master.css
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all-320pxst2.ck12.org/.../concept_coversheet.css
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all768px1023pxst2.ck12.org/media/.../concept.css
all-767pxst2.ck12.org/media/.../concept.css
all-600pxst2.ck12.org/media/.../concept.css
screen-47.875emst2.ck12.org/media/.../concept.css
all320px1023pxst2.ck12.org/media/.../modalities.css
all768px-st2.ck12.org/media/.../modalities.css
all-767pxst2.ck12.org/media/.../modalities.css
all768px1023pxst2.ck12.org/media/.../modalities.css
all768px1024pxst2.ck12.org/media/.../modalities.css
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Analytics10.0

100% of pages use analytics

Google Tag Manager

  • Every page in this website is using Google Tag Manager. This is excellent and should allow for a complete analysis of visitor behaviour.

Page titles10.0

100% of pages have defined titles

0% of page titles are weak

  • All pages were found to use page titles appropriately. Page titles appear in search results and at the top of the browser's window when visiting the site. Appropriate page titles are particularly important for search engine optimisation.

Printability10.0

100% of pages are optimised for printing

  • All of this website appears to be optimised for printing (using CSS).

Media specific CSS detected

MediaMin widthMax widthCSS file
all768px1024pxst3.ck12.org/media/.../content.css
all-767pxst3.ck12.org/media/.../content.css
all768px1023pxst2.ck12.org/media/.../tangerine-ui.css
all768px-st2.ck12.org/media/.../tangerine-ui.css
all-767pxst2.ck12.org/media/.../tangerine-ui.css
all768px899pxst2.ck12.org/media/.../tangerine-ui.css
all768px1023pxst2.ck12.org/media/.../tangerine-ui.css
all900px1023pxst2.ck12.org/media/.../tangerine-ui.css
all768px-st2.ck12.org/media/.../tangerine-ui.css
all1024px1440pxst2.ck12.org/media/.../tangerine-ui.css
all1280px-st2.ck12.org/media/.../tangerine-ui.css
all320px400pxst2.ck12.org/media/.../tangerine-ui.css
only screen1025px-st2.ck12.org/media/.../tangerine-ui.css
only screen-1024pxst2.ck12.org/media/.../tangerine-ui.css
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URL format10.0

  • This website uses appropriate web addresses (URLs) throughout. This is excellent and will help search engine placement, usability and the marketability of this website.

Popularity10.0

2,092 Most popular website in the world

This website recently saw a moderate increase in popularity.

  • This is the 2,092 most popular website in the world.
  • Over the past 3 months, this website has experienced a moderate increase in popularity.
  • This website accounts for 68.7% of the Internet traffic to ck12.org and its subdomains.

Source: Alexa

Domain agei

  • Sorry, we cannot check the domain age of .org websites.

Freshnessi

  • Sorry, we couldn't determine when this website was last updated. This is usually because its web server isn't reporting this information and we couldn't find enough other dates in the content of pages.

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