[Webkit-unassigned] [Bug 149185] New: CSS parser unable to recover after invalid @media block

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=149185

            Bug ID: 149185
           Summary: CSS parser unable to recover after invalid @media
                    block
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: Macintosh
                OS: Mac OS X 10.10
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: hartman.wiki at gmail.com

Created attachment 261241
  --> https://bugs.webkit.org/attachment.cgi?id=261241&action=review
Reduced testcase

The attached testcase shows that after an invalid media query block inside <style>, the CSS parser is unable to recover and ignores anything and everything that will follow the invalid block.

Browsers like Chrome and Firefox, ignore the first statement after the invalid media query block (which in the testcase would have made the div blue), but then do apply any following statements (in the testcase making the div green).

This caused a serious CSS styling issue on Wikimedia Commons, where a good percentage of CSS statements was ignored by Safari. Downstream report in Wikipedia: https://phabricator.wikimedia.org/T112552#1643002

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