Erik Nordin 17dbae2125 Bug 1613511 - Disallow @import rules for all Constructable StyleSheets functions r=emilio
- Add enum AllowImportRules to CSS parsing.
- `replaceSync()` will skip over @import rules and continue parsing.
- `replace()` will skip over @import rules and continue parsing.
- `insertRule()` will throw a syntax error on @import rules.
- Modify WPT test cases to reflect these changes.

Differential Revision: https://phabricator.services.mozilla.com/D61882

--HG--
extra : moz-landing-system : lando
2020-03-12 18:11:09 +00:00
..