Warnings of valid HTML5 attributes in Eclipse

Question

I use Eclipse and I write jsp files with HTML5 content. So I have for example this line:

I

Answer 1

Eclipse 3.6 introduced a new field under:

Validation -> HTML Syntax: Ignore specified attribute names in validation

Add the OpenGraph, RDFa or other non-HTML5 attributes you want the validator to ignore:

You will need to re-validate the project, then the warnings will be gone.