One issue that came up in #3207 (noticed by @heycam while reviewing code from @emilio) is that the spec should define to what extent namespace prefixes are required to be declared. In particular, how do:
@supports (content: attr(n|href)) {
}CSS.supports("content", "attr(n|href)");CSS.supports("(content: attr(n|href))");depend on whether the namespace prefix n has been declared? Do they:
- treat all namespace prefixes as already declared?
- treat all namespace prefixes as undeclared (invalid)?
- depend on a set of namespace declarations (which set, exactly)?
One issue that came up in #3207 (noticed by @heycam while reviewing code from @emilio) is that the spec should define to what extent namespace prefixes are required to be declared. In particular, how do:
depend on whether the namespace prefix
nhas been declared? Do they: