1 files changed, 16 insertions, 0 deletions
diff --git a/dom/html/HTMLScriptElement.cpp b/dom/html/HTMLScriptElement.cpp
index 006bff23a7..9fbf46699d 100644
--- a/dom/html/HTMLScriptElement.cpp
+++ b/dom/html/HTMLScriptElement.cpp
@@ -88,6 +88,12 @@ bool HTMLScriptElement::ParseAttribute(int32_t aNamespaceID, nsAtom* aAttribute,
       ParseFetchPriority(aValue, aResult);
       return true;
     }
+
+    if (aAttribute == nsGkAtoms::blocking &&
+        StaticPrefs::dom_element_blocking_enabled()) {
+      aResult.ParseAtomArray(aValue);
+      return true;
+    }
   }
 
   return nsGenericHTMLElement::ParseAttribute(aNamespaceID, aAttribute, aValue,
@@ -251,4 +257,14 @@ nsDOMTokenList* HTMLScriptElement::Blocking() {
   return mBlocking;
 }
 
+bool HTMLScriptElement::IsPotentiallyRenderBlocking() {
+  return BlockingContainsRender();
+
+  // TODO: handle implicitly potentially render blocking
+  // https://html.spec.whatwg.org/#implicitly-potentially-render-blocking
+  // A script element el is implicitly potentially render-blocking if el's type
+  // is "classic", el is parser-inserted, and el does not have an async or defer
+  // attribute.
+}
+
 }  // namespace mozilla::dom