org-html-html5-fancy

org-html-html5-fancy is a variable defined in `ox-html.el'.
Its value is

nil

Documentation:
Non-nil means using new HTML5 elements.
This variable is ignored for anything other than HTML5 export.

For compatibility with Internet Explorer, it's probably a good
idea to download some form of the html5shiv (for instance
https://code.google.com/p/html5shiv/) and add it to your
HTML_HEAD_EXTRA, so that your pages don't break for users of IE
versions 8 and below.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.4 of Emacs.