Is there a way for me to identify what deletes CSS classes from an element during the first page load?

On a page where an element (specifically, a TextBox) initially has two CSS classes assigned when it loads, something strange is happening. After the page renders and JavaScript runs, the class attribute of the input element mysteriously becomes empty.

I can confirm that the element did indeed have classes originally because even good old IE6 shows me the source code with the classes intact. However, upon inspecting the element, I see that the class attribute is now blank.

Is there a way, in any browser, to set up a watch that triggers a debugging break point whenever an element's attributes change?

Answer №1

Currently using Firebug version 1.6X.0b1 on Firefox 4.0 nightlies, I've discovered an interesting feature called 'Break on attribute change' when you right click on an element in the HTML Inspector tab. It's possible that this option may not have been available in older versions of Firebug, but it could be exactly what you're looking for.

--Update: It appears that this feature is also present in earlier versions

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