[jggube]

Yeah, you'd have to enforce very strict nesting rules in the document structure, which is impractical, especially for more complicated, multi-user web apps. Classes provide flexibility and atomicity.

> What’s the advantage of [shape-type="1"] over .shape-type-1? In terms of CSS selector performance, classes are often faster than custom attributes, so I also don't know if there are any advantages in this particular use-case.