XHTML Strict Specs, Part 1

Focus:

• More Examples

  • This invalid (incorrect):

    src="SMILE.gif" ALT="Smile"

    Lower-case letters must be used for the attribute's name — always, without exception in XHTML.

  • This is valid (correct):

    src="SMILE.gif" alt="Smile"

    Upper-case letters may be used in the attribute's value — optionally, if you want to.