Report more specific errors for invalid CSS selectors. Reviewed by @heycam in https://bugzilla.mozilla.org/show_bug.cgi?id=1384216.
---
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] There are tests for these changes
Source-Repo: https://github.com/servo/servo
Source-Revision: b2f8974ab88c98277f03c727708096edce898974
<!-- Please describe your changes on the following line: -->
Automatically verify that derive() lists are alphabetically ordered #18172
---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix#18172 (github issue number if applicable).
<!-- Either: -->
- [X] There are tests for these changes OR
- [ ] These changes do not require tests because _____
<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->
<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->
Source-Repo: https://github.com/servo/servo
Source-Revision: 474369618965569407d127b1e8c481e757cc59d3
