About this case

This test case ensures that the is attribute it handled correctly. Tidy accepts is for all versions of HTML, but ensures that it is correct per the HTML5 rules.

• is must have a value.
• is must have a value.
• is must contain a hyphen.
• is must not contain a space.
• is is correct for this paragraph.
• is can be used with user-defined tags… …unless they look like autonomous custom tags. is cannot be used with autonomous custom tags detected in the document, either.