[Webkit-unassigned] [Bug 17760] New: <img> treats empty src as no image at all

[bugzilla-daemon at webkit.org]

http://bugs.webkit.org/show_bug.cgi?id=17760

           Summary: <img> treats empty src as no image at all
           Product: WebKit
           Version: 525+ (Nightly build)
          Platform: PC
        OS/Version: Windows XP
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Images
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: yuzhu.shen at gmail.com


Consider the following example:

<img src="" width="100" height="100" alt="" onerror="processLoadError();">

WebKit treats src="" as no image at all and doesn't try to load. While IE and
Firefox will try to load the image and (in most cases) trigger the onerror
handler. (IE7 and Firefox2/3 are tested.)

The reason why IE and Firefox do so is that src="" should be regarded as a
relative URI and resolved using the base URI. For example, if the base URI is
"http://example.org/images/", the <img> with src="" should try to load this
URI. In most cases, this will trigger onerror handler. (However, if an image
"example.jpg" is set as the default document for this path, the <img> will load
this "example.jpg".)

A real world example is as follows:
1. Go to
http://qun.51.com/category_search.php?type1_name=%C7%E9%B8%D0%C1%BD%D0%D4
2. All missing images should be replaced with a "noclublogo.gif" (as llustrated
in the snapshot).
3. WebKit doesn't do so, while IE and Firefox do.


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