Why is a table td not suitable as a containing block for absolute positioning of an element when other browsers allow that CSS feature?

Absolute positioning requires a containing element. I'm taking a class on HTML5 and CSS3 from ed2go.com. A photo display using thumbnails in a table shows the full size picture with its corner in the center of the thumbnail when you hover over the thumbnail.
Snippet of code for one td
<pre><nowiki><td>
<img src="pix2/flower01.png" alt="" class="small">
<img src="pix2/flower01.png" alt="" class="left"></td></nowiki></pre>
The "small" class makes the picture a thumbnail. The "left" class positions the full size picture with its corner in the center of the thumbnail when the mouse hovers over the thumbnail. This works correctly in Internet Explorer but not Firefox. The reason is that Firefox does not consider a td to be a containing element by using position:relative so the large picture corner is in the center of the viewport. Although td is not a block element it would seem that allowing absolute positioning with respect to a td would be a good default implementation.
The "problem" can be "fixed" by simply placing the two <img> inside a . 
You can see the two different implementations at http://s179350112.onlinehome.us/temp6.htm and http://s179350112.onlinehome.us/temp7.htm
Is Firefox implementing the Standard correctly? Would a default implementation as in Internet Explorer be allowed by the Standard?

Yes, I see the same on the temp7 page.
Maybe someone at the MozillaZine "Web Development/Standards Evangelism" forum knows more about this.
*http://forums.mozillazine.org/viewforum.php?f=25
The helpers at that forum are more knowledgeable about web development issues. 
You need to register at the MozillaZine forum site in order to post at that forum.

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Thx!
Message was edited by:
delphosbean
Message was edited by:
delphosbean
Message was edited by:
delphosbean

You are supposed to be able to preserve you formatting using the <pre></pre> tags but I can't get this to work either 
 
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Why is a table td not suitable as a containing block for absolute positioning of an element when other browsers allow that CSS feature?

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