Bug 256180 parser part - Insert elements as siblings instead of children at the Blink-defined magic depth for compatibility. r=smaug

MozReview-Commit-ID: K8fgv3rgklt

parser/html/nsHtml5TreeOpExecutor.cpp

@@ -65,12 +65,13 @@ nsHtml5TreeOpExecutor::nsHtml5TreeOpExecutor()
   , mSuppressEOF(false)
   , mReadingFromStage(false)
   , mStreamParser(nullptr)
-  , mPreloadedURLs(23)  // Mean # of preloadable resources per page on dmoz
+  , mPreloadedURLs(23) // Mean # of preloadable resources per page on dmoz
   , mSpeculationReferrerPolicy(mozilla::net::RP_Unset)
   , mStarted(false)
   , mRunFlushLoopOnStack(false)
   , mCallContinueInterruptedParsingIfEnabled(false)
   , mAlreadyComplainedAboutCharset(false)
+  , mAlreadyComplainedAboutDeepTree(false)
 {
 }
 
@@ -815,6 +816,25 @@ nsHtml5TreeOpExecutor::ComplainAboutBogusProtocolCharset(nsIDocument* aDoc)
                                   "EncProtocolUnsupported");
 }
 
+void
+nsHtml5TreeOpExecutor::MaybeComplainAboutDeepTree(uint32_t aLineNumber)
+{
+  if (mAlreadyComplainedAboutDeepTree) {
+    return;
+  }
+  mAlreadyComplainedAboutDeepTree = true;
+  nsContentUtils::ReportToConsole(nsIScriptError::errorFlag,
+                                  NS_LITERAL_CSTRING("HTML parser"),
+                                  mDocument,
+                                  nsContentUtils::eHTMLPARSER_PROPERTIES,
+                                  "errDeepTree",
+                                  nullptr,
+                                  0,
+                                  nullptr,
+                                  EmptyString(),
+                                  aLineNumber);
+}
+
 nsHtml5Parser*
 nsHtml5TreeOpExecutor::GetParser()
 {