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66
100
CK12-Foundation
https://www.ck12.org/student/
4 high issues
12.1%
4 medium issues
12.1%
5 low issues
15.2%
20 tests passed
60.6%
0.01 seconds
3.23 kB
14 resources
Secure
Seo
Title
The title tag is perfect.
CK12-Foundation
Meta description
The meta description tag is missing or empty.
Headings
There is no h1 tag on the webpage.
Content keywords
No relevant keywords found on the webpage.
ck12foundation
Image keywords
There are 1 images with missing alt attributes.
  1. data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz48c3ZnIHdpZHRoPSI5OTk5OXB4IiBoZWlnaHQ9Ijk5OTk5cHgiIHZpZXdCb3g9IjAgMCA5OTk5OSA5OTk5OSIgdmVyc2lvbj0iMS4xIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHhtbG5zOnhsaW5rPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5L3hsaW5rIj48ZyBzdHJva2U9Im5vbmUiIGZpbGw9Im5vbmUiIGZpbGwtb3BhY2l0eT0iMCI+PHJlY3QgeD0iMCIgeT0iMCIgd2lkdGg9Ijk5OTk5IiBoZWlnaHQ9Ijk5OTk5Ij48L3JlY3Q+IDwvZz4gPC9zdmc+
SEO friendly URL
The URL is SEO friendly.
https://www.ck12.org/student/
404 page
The website has 404 error pages.
https://www.ck12.org/404-ecbebfd4642eecab95351b586c9a1324
Robots.txt
The webpage can be accessed by search engines.
Noindex
The webpage does not have a noindex tag set.
In-page links
The number of links on the webpage is okay.
Language
The webpage does not have a language declared.
Favicon
The webpage does not have a favicon.
Performance
Text compression
The HTML file is compressed.
Load time
The webpage loaded in 0.01 seconds.
Page size
The size of the HTML webpage is 3,225.00.
HTTP requests
There are fewer than 14 HTTP requests on the webpage.
  1. https://www.ck12.org/media/buildnumber.js
  2. https://static3.ck12.org/media/build-20221013120914/outdatedbrowser/outdatedbrowser.js
  3. https://tinymce.ck12.org/tinymce-loader.js
  4. https://accounts.google.com/gsi/client
  5. https://static2.ck12.org/media/build-20221013120914/dexterjs/dexterjs.min.js
  6. https://d3lkjnwva6z405.cloudfront.net/MathJax-2.7.2/MathJax.js?config=TeX-AMS-MML_SVG
  7. https://static3.ck12.org/media/build-20221013120914/course-book-app/dist/vendors.js
  8. https://static3.ck12.org/media/build-20221013120914/course-book-app/dist/main.js
  9. https://static1.ck12.org/media/build-20221013120914/lib/require.js
  10. https://static.ck12.org/licenceDialog/v1.0.10/main.js
  11. https://static3.ck12.org/media/build-20221013120914/i18nWidget/lib/main.js
  1. https://static1.ck12.org/media/build-20221013120914/course-book-app/dist/main.css
  1. data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz48c3ZnIHdpZHRoPSI5OTk5OXB4IiBoZWlnaHQ9Ijk5OTk5cHgiIHZpZXdCb3g9IjAgMCA5OTk5OSA5OTk5OSIgdmVyc2lvbj0iMS4xIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHhtbG5zOnhsaW5rPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5L3hsaW5rIj48ZyBzdHJva2U9Im5vbmUiIGZpbGw9Im5vbmUiIGZpbGwtb3BhY2l0eT0iMCI+PHJlY3QgeD0iMCIgeT0iMCIgd2lkdGg9Ijk5OTk5IiBoZWlnaHQ9Ijk5OTk5Ij48L3JlY3Q+IDwvZz4gPC9zdmc+
  1. https://www.googletagmanager.com/ns.html?id=GTM-NFJ3V2
Image format
There are 1 images that are not using the AVIF, WebP format.
  1. data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz48c3ZnIHdpZHRoPSI5OTk5OXB4IiBoZWlnaHQ9Ijk5OTk5cHgiIHZpZXdCb3g9IjAgMCA5OTk5OSA5OTk5OSIgdmVyc2lvbj0iMS4xIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHhtbG5zOnhsaW5rPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5L3hsaW5rIj48ZyBzdHJva2U9Im5vbmUiIGZpbGw9Im5vbmUiIGZpbGwtb3BhY2l0eT0iMCI+PHJlY3QgeD0iMCIgeT0iMCIgd2lkdGg9Ijk5OTk5IiBoZWlnaHQ9Ijk5OTk5Ij48L3JlY3Q+IDwvZz4gPC9zdmc+
JavaScript defer
The are 10 javascript resources without the defer attribute.
  1. https://www.ck12.org/media/buildnumber.js
  2. https://static3.ck12.org/media/build-20221013120914/outdatedbrowser/outdatedbrowser.js
  3. https://tinymce.ck12.org/tinymce-loader.js
  4. https://static2.ck12.org/media/build-20221013120914/dexterjs/dexterjs.min.js
  5. https://d3lkjnwva6z405.cloudfront.net/MathJax-2.7.2/MathJax.js?config=TeX-AMS-MML_SVG
  6. https://static3.ck12.org/media/build-20221013120914/course-book-app/dist/vendors.js
  7. https://static3.ck12.org/media/build-20221013120914/course-book-app/dist/main.js
  8. https://static1.ck12.org/media/build-20221013120914/lib/require.js
  9. https://static.ck12.org/licenceDialog/v1.0.10/main.js
  10. https://static3.ck12.org/media/build-20221013120914/i18nWidget/lib/main.js
DOM size
The DOM size is optimal.
The HTML file has 44 DOM nodes.
Security
HTTPS encryption
The webpage uses HTTPS encryption.
The HTML file has https://www.ck12.org/student/ DOM nodes.
Mixed content
There are no mixed content resources on the webpage.
Server signature
The webpage has a public server signature.
Apache/2.4.41 (Ubuntu)
Unsafe cross-origin links
The webpage does not have unsafe cross-origin links.
Plaintext email
The webpage does not contain any plaintext emails.
Miscellaneous
Structured data
The webpage has structured data.
      Meta viewport
      The webpage has a meta viewport tag set.
      width=device-width, initial-scale=1, minimum-scale=1.0
      Character set
      The webpage has a charset value set.
      utf-8
      Sitemap
      The website has sitemaps.
      1. https://www.ck12.org/sitemapindex.xml
      2. https://www.ck12.org/sitemap_subjects_index.xml
      Social
      The webpage does not contain any social links.
      Content length
      The are less than 500 words on the webpage.
      The webpage has 0 words.
      Text to HTML ratio
      The text to HTML ratio is under 10%
      The text to HTML ratio is 0%.
      Inline CSS
      The webpage contains inline CSS code.
      1. margin: 0px; position: initial !important;
      2. pointer-events: none; position: absolute; top: 0; left: 0; width: 99vw; height: 99vh; max-width: calc(99vw - (100vw - 100%)); max-height: 99vh;
      3. display: none; visibility: hidden
      Deprecated HTML
      There are no deprecated HTML tags on the webpage.