HTML5 doctype

Estimated Support About

73.17% supported


  • 1

    Buggy. Renders as if there was no doctype with an Outlook email, and in HTML5 otherwise.

  • 2

    Not supported. The HTML5 doctype has no impact here.

  • 3

    Partial support. Depends on the version of Internet Explorer installed.

Know something we don't?

Is any of the above data outdated? Or do you want to add a new email client to the list? Heads on to GitHub and edit the data file!

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Test it yourself

This feature was last tested on July 25, 2019.

If you want to test this feature in the same conditions as we did, you can get our test code and run a test by yourself. Make sure to follow our testing recommendations first.