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I have a problem with my firefox extension I have a XUL popup panel with a hbox for the tag cloud, and a JS code to add divs to this hbox: <hbox id="tag_base" ondblclick="alert('done')"/> JS: var root = document.getElementById('tag_base'); var tag = document.createElement('div'); tag.textContent = 'test'; root.appendChild(tag); var rect = tag.getBoundingClientRect() alert(rect.top) I need to get the dimensions of each added div, however, getBoundingClientRect simply refuses to work. If I remove alerts, it's always zero. With alerts the story is different: The first time the alert is called it returns zero, although the div appears on the screen. Any subsequent alerts return the correct coordinates. If I set a breakpoint in Chromebug, everything is reported correctly. If I do not interupt the execution in any way, and run a loop, only zeroes got returned. This has got me quite confused. Calling "boxObject" produces the same results, while "getClientRects[0]" is undefined on the first call. Any hints on what might be causing this will be greatly appreciated.

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