Current workaround is to use mutation events but it's awkward and doesn't compare — usability-wise — to what could be implemented as native support in web inspector. In complex applications, being able to see which code causes element to change its style is indispensable. Note that Firebug supposedly has experimental support for this — http://getfirebug.com/doc/breakpoints/demo.html#css
Created attachment 97792 [details] [patch] initial version
Comment on attachment 97792 [details] [patch] initial version View in context: https://bugs.webkit.org/attachment.cgi?id=97792&action=review > Source/WebCore/inspector/InspectorDOMDebuggerAgent.cpp:146 > + InspectorDebuggerAgent* debuggerAgent = m_debuggerAgent; It seems that m_debuggerAgent is never 0. If so please remove this check here and in other places in this file.
Committed r89245: <http://trac.webkit.org/changeset/89245>