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Expected overflow behavior for element with clip set?

From: Eli Friedman <sharparrow1@yahoo.com>
Date: Thu, 1 Mar 2007 10:14:02 -0800 (PST)
To: www-style@w3.org
Message-ID: <556518.24693.qm@web52110.mail.yahoo.com>

(Resending because it apparently got lost the first
time.)

Given the following HTML:
<style>
..parent {overflow: auto; position: relative;
         height: 100px; width: 100px}
..child {background: blue; position: absolute;
        clip: rect(0pt, 50px, 50px, 0pt);
        width: 200px; height: 200px;}
</style>
<div class=parent>
  <div class=child></div>
</div>

Is the browser expected to show scrollbars (or
whatever equivalent scrolling mechanism)?

Every browser on my computer (Opera 9, IE 6, Firefox)
shows scrollbars in this situation.  However, there
isn't actually anything there because it's been
clipped out.

I've written a patch for Firefox that changes the
behavior to only show a scrolling mechanism if there
is visible content to scroll to.  This changes the
behavior so that scrollbars no longer appear on my
testcase above.  This seems like a much more
appropriate interpretation of the specification, but
I'm not sure if there's anything else I need to
consider.  Comments?

(See
https://bugzilla.mozilla.org/show_bug.cgi?id=372037
for my patch.)

-Eli Friedman


 
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Received on Thursday, 1 March 2007 21:25:17 GMT

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