Backed out changeset dd72eb737d96 (bug 1632975) for causing Bug 1800981 CLOSED TREE

dom/script/ScriptLoader.cpp

@@ -1186,6 +1186,13 @@ bool ScriptLoader::ProcessInlineScript(nsIScriptElement* aElement,
       }
     }
 
+    {
+      // We must perform a microtask checkpoint when inserting script elements
+      // as specified by: https://html.spec.whatwg.org/#parsing-main-incdata
+      // For the non-inline module cases this happens in ProcessRequest.
+      mozilla::nsAutoMicroTask mt;
+    }
+
     // This calls OnFetchComplete directly since there's no need to start
     // fetching an inline script.
     nsresult rv = modReq->OnFetchComplete(NS_OK);