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[cssom][css-nesting] Error behavior for insertRule with declaration blocks.
In https://github.com/w3c/csswg-drafts/issues/10234 we resolved to give insertRule
the ability to parse and insert declaration blocks (as CSSNestedDeclarations
rules).
As of recent spec edits, insertRule is now set up to parse a declaration block (after the regular rule parsing), and throw an error when that declaration block is empty. https://drafts.csswg.org/cssom/#insert-a-css-rule, Step 4.
Is this behavior indeed what we want? @emilio points out that it's possibly weird that potentially-unknown-property:foo
throws, but potentially-unknown-property: foo; color:red
doesn't.
On the other hand, the following would lead to no CSSNestedDeclarations
rule when parsed normally:
.a {
.b { ... }
potentially-unknown-property: foo;
}
Whereas this would:
.a {
.b { ... }
potentially-unknown-property: foo;
color:red;
}
So probably the specified behavior isn't too bad, but I'd like to discuss to either get a stamp for this change, or to see if we can do better somehow.