[Webkit-unassigned] [Bug 64778] New: Undefined behavior for EOF in foreign content mode in HTML5 parser

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=64778

           Summary: Undefined behavior for EOF in foreign content mode in
                    HTML5 parser
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: simonjam at chromium.org
                CC: inferno at chromium.org, tonyg at chromium.org
            Blocks: 64419


The spec does not define how to handle end-of-file while in foreign content mode. For example:

<svg>
<g>
<use xlink:href="#test"/>
<rect id="test">
<script>
document.body.innerHTML = "PASS";

Should the script execute when it reaches the end of the file? If not, it leads to problems with the <use> tag, because recalcStyle() will try to build a shadow DOM for it. The shadow DOM copies the <script>, but since the parser didn't execute the script, it is still un-started, so the copy will execute when it's inserted into the shadow DOM.

The correct behavior should be defined in the HTML5 spec, then we need to fix WebKit.

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