<a href="http://bugs.webkit.org/show_bug.cgi?id=8991">Bug 8991</a>: REGRESSION: missing or broken CSS custom cursors are displayed as a missing image icon.<p>
Move the cursor over the blue box - it should not turn into a missing image icon, and should turn into an I-beam over text.

<div style="width:100px;height:50px;background-color:lightblue; cursor:url(nonexistent.png), auto;"><span style="cursor:url(nonexistent.png), auto;">some text</span></div>
<div style="width:100px;height:50px;background-color:lightblue; cursor:url(nonexistent.png);"></div>

<hr>
<a href="http://bugs.webkit.org/show_bug.cgi?id=8991">Bug 6001</a>: WebKit does not handle fallback custom cursors<p>
Move the cursor over the blue box - it should become a help cursor (question mark).
<div style="width:100px;height:100px;background-color:lightblue; cursor:url(resources/helpCursor.tiff), help;"></div>