nsresult rv = mStyleSet->AttributeChanged(mPresContext, aContent, aAttribute, aHint);
nsresult rv = mStyleSet->AttributeChanged(mPresContext, aContent, aNameSpaceID, aAttribute, aHint);
PresShell::AttributeChanged(nsIDocument *aDocument,                            nsIContent*  aContent,                            nsIAtom*     aAttribute,                            PRInt32      aHint){  NS_PRECONDITION(nsnull != mRootFrame, "null root frame");  EnterReflowLock();  nsresult rv = mStyleSet->AttributeChanged(mPresContext, aContent, aAttribute, aHint);  VERIFY_STYLE_TREE;  ExitReflowLock();  return rv;}