[Webkit-unassigned] [Bug 271718] New: CSSOM selector text serialization misbehaves when there are more than 8192 tokens

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=271718

            Bug ID: 271718
           Summary: CSSOM selector text serialization misbehaves when
                    there are more than 8192 tokens
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: qianlangchen at apple.com

Created attachment 470609

  --> https://bugs.webkit.org/attachment.cgi?id=470609&action=review

Test case: Open to see instructions

If a CSS rule is something like
    a1, a2, a3, a4, ......., a8190, a8191, a8192, a8193 {
        color: blue;
    }

Where there are more than 8192 whitespace-separated tokens in the selector text, then that rule's `cssText` getter returns a serialized text that's missing some of the tokens, for instance something like
    a1, a2, a3, a4, ......., a8190, a8191 {
        color: blue;
    }

(To clarify, the ellipses are NOT literal and actually include all the aXXX tokens)

This behavior does not replicate on Firefox or Chrome. The specs (https://drafts.csswg.org/cssom/) does not seem to suggest there be any maximum limit of selector text length CSSOM should support.

See attached for a downloadable HTML test case.

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