Created attachment 245387 [details] Testcase + js workaround to reflow the layout Testcase attached. this testcase is a mobile navbar opener stuff AR: after opening navbar the #content disappears with wrong width; ER: the reflow algorythm renders correctly the #content layer after transition Workaround added to testcase: after opening navbar, if you press the "Reappend" button that causes reflow and renders correctly the object.