[Webkit-unassigned] [Bug 135756] New: Elements whose contents start with an astral Unicode symbol disappear when CSS `::first-letter` is applied to them

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=135756

           Summary: Elements whose contents start with an astral Unicode
                    symbol disappear when CSS `::first-letter` is applied
                    to them
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mathias at qiwi.be
                CC: ap at webkit.org


Created an attachment (id=236279)
 --> (https://bugs.webkit.org/attachment.cgi?id=236279&action=review)
Reduced test case

Elements whose contents start with an astral Unicode symbol (such as U+1D306, which I’ll use in examples) disappear when CSS `::first-letter` is applied to them.

For example, the following displays just fine, with and without `::first-letter { background: red; }`:

    <p>Lorem ipsum</p>

But prepend any astral symbol to the element’s contents and it disappears when the `::first-letter` styles are active:

    <p>&#x1D306;Lorem ipsum (1)</p>

Blink has the same bug: https://code.google.com/p/chromium/issues/detail?id=401945

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