CSS: Detect more WebKit styles erroneously reported as percentages

[GulajavaMinistudio]

Ref 692f9d4
Fixes jquerygh-3777
Closes jquerygh-3778

Summary

Checklist

• All authors have signed the CLA at https://cla.js.foundation/jquery/jquery
• New tests have been added to show the fix or feature works
• Grunt build and unit tests pass locally with these changes
• If needed, a docs issue/PR was created at https://github.com/jquery/api.jquery.com