General Information


If you want to contribute, fork the Git-Repro (frontendnetwork/faq (opens in a new tab)) and create a new document under pages/metatags named <title of your page>.md.

You can also change existing doc-pages. Just click on "Edit" on the corresponding page. Then just open a pull request and we'll review your page and add it.

How to contribute

Please write your changes in Markdown (opens in a new tab).

Anyone can:

  • Create a new page (source/ → new file → .md file)
  • Edit files

Please don't open issues but instead directly make a Pull Request with your edits/new creations.

Add extensions to the WHATWG Wiki

If you want to add your meta-extensions to the WhatWG-Wiki, please register on WHATWG Wiki (opens in a new tab). To request an account, ask an autoconfirmed user on Chat (opens in a new tab). Then go to Registry <meta name> (opens in a new tab), edit the page and add your meta tag (in alphabetical order!). You can link to our site for the documentation of your meta-tag.

Add extension to W3 Validator

Just send an e-mail to, informing the W3 about the meta-tag you added to the WHATWG Wiki, their purpose, and state that you added them to the WHATWG Wiki. In newer versions of the W3 Validator, this is not necessary anymore.


All security issues and vulnerabilites regarding this repo which are fixed or in the process of being fixed are listed on the Responsible vulnerability disclosure acknowledgements (opens in a new tab).


All text and code in this repository is licensed under CC-BY 4.0 (opens in a new tab) besides the aboved named licenses for dependencies.