About HTML class attribute, that assigns CSS class (or classes?) to a tag. The use of spaces, like in
<tag class="a b">....</tag>
is valid?
This syntax is used by some web-designers and occurs into exported HTML of Adobe InDesign (tested with versions 5 and 6), and another HTML generation softwares...
It (class="a b"
) is a valid W3C syntax? What versions of CSS and HTML?
(starting from which version became valid?)
EDIT: a natural subquestion "W3C say how to interpret it?" (it is an "override" or another renderization behaviour?) was posted here.