mDocument = nsnull; mDisabled = PR_FALSE;
CSSStyleSheetImpl::CSSStyleSheetImpl(nsIURL* aURL)  : nsICSSStyleSheet(),    mURL(nsnull), mFirstChild(nsnull),     mOrderedRules(nsnull), mWeightedRules(nsnull),     mNext(nsnull),    mRuleHash(nsnull){  NS_INIT_REFCNT();  mURL.SetAddRef(aURL);  mParent = nsnull;  mRuleCollection = nsnull;  mImportsCollection = nsnull;  mScriptObject = nsnull;#ifdef DEBUG_REFS  ++gInstanceCount;  fprintf(stdout, "%d + CSSStyleSheet size: %d\n", gInstanceCount, sizeof(*this));#endif}