From 4f0d9497f268e79ff47ed4509273204566961199 Mon Sep 17 00:00:00 2001
From: Moonchild <moonchild@palemoon.org>
Date: Thu, 13 Aug 2020 13:42:52 +0000
Subject: Issue #618: Ignore 'event' and 'for' attributes for module scripts.

Because the spec says so.
---
 dom/script/ScriptLoader.cpp | 53 +++++++++++++++++++++++++--------------------
 1 file changed, 30 insertions(+), 23 deletions(-)

(limited to 'dom')

diff --git a/dom/script/ScriptLoader.cpp b/dom/script/ScriptLoader.cpp
index 9de9a1d037..903822ef57 100644
--- a/dom/script/ScriptLoader.cpp
+++ b/dom/script/ScriptLoader.cpp
@@ -299,8 +299,12 @@ ScriptLoader::~ScriptLoader()
 // <script for=... event=...> element.
 
 static bool
-IsScriptEventHandler(nsIContent* aScriptElement)
+IsScriptEventHandler(ScriptKind kind, nsIContent* aScriptElement)
 {
+  if (kind != ScriptKind::Classic) {
+    return false;
+  }
+
   if (!aScriptElement->IsHTMLElement()) {
     return false;
   }
@@ -1198,35 +1202,38 @@ ScriptLoader::ProcessScriptElement(nsIScriptElement *aElement)
 
   nsCOMPtr<nsIContent> scriptContent = do_QueryInterface(aElement);
 
+  // Determine whether this is a classic script or a module script.
+  nsAutoString type;
+  bool hasType = aElement->GetScriptType(type);
+  ScriptKind scriptKind = ScriptKind::Classic;
+  if (ModuleScriptsEnabled() &&
+      !type.IsEmpty() && type.LowerCaseEqualsASCII("module")) {
+    scriptKind = ScriptKind::Module;
+  }
+
   // Step 13. Check that the script is not an eventhandler
-  if (IsScriptEventHandler(scriptContent)) {
+  if (IsScriptEventHandler(scriptKind, scriptContent)) {
     return false;
   }
 
   JSVersion version = JSVERSION_DEFAULT;
 
-  // Check the type attribute to determine language and version.
-  // If type exists, it trumps the deprecated 'language='
-  nsAutoString type;
-  bool hasType = aElement->GetScriptType(type);
-
-  ScriptKind scriptKind = ScriptKind::Classic;
-  if (!type.IsEmpty()) {
-    if (ModuleScriptsEnabled() && type.LowerCaseEqualsASCII("module")) {
-      scriptKind = ScriptKind::Module;
-    } else {
+  // For classic scripts, check the type attribute to determine language and
+  // version. If type exists, it trumps the deprecated 'language='
+  if (scriptKind == ScriptKind::Classic) {
+    if (!type.IsEmpty()) {
       NS_ENSURE_TRUE(ParseTypeAttribute(type, &version), false);
-    }
-  } else if (!hasType) {
-    // no 'type=' element
-    // "language" is a deprecated attribute of HTML, so we check it only for
-    // HTML script elements.
-    if (scriptContent->IsHTMLElement()) {
-      nsAutoString language;
-      scriptContent->GetAttr(kNameSpaceID_None, nsGkAtoms::language, language);
-      if (!language.IsEmpty()) {
-        if (!nsContentUtils::IsJavaScriptLanguage(language)) {
-          return false;
+    } else if (!hasType) {
+      // no 'type=' element
+      // "language" is a deprecated attribute of HTML, so we check it only for
+      // HTML script elements.
+      if (scriptContent->IsHTMLElement()) {
+        nsAutoString language;
+        scriptContent->GetAttr(kNameSpaceID_None, nsGkAtoms::language, language);
+        if (!language.IsEmpty()) {
+          if (!nsContentUtils::IsJavaScriptLanguage(language)) {
+            return false;
+          }
         }
       }
     }
-- 
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