diff --git a/dom/html/HTMLInputElement.cpp b/dom/html/HTMLInputElement.cpp
index bd4ed10853..efad221078 100644
--- a/dom/html/HTMLInputElement.cpp
+++ b/dom/html/HTMLInputElement.cpp
@@ -865,6 +865,7 @@ HTMLInputElement::HTMLInputElement(already_AddRefed<mozilla::dom::NodeInfo>& aNo
   , mNumberControlSpinnerSpinsUp(false)
   , mPickerRunning(false)
   , mSelectionCached(true)
+  , mHasPatternAttribute(false)
 {
   // We are in a type=text so we now we currenty need a nsTextEditorState.
   mInputData.mState = new nsTextEditorState(this);
@@ -1150,6 +1151,10 @@ HTMLInputElement::AfterSetAttr(int32_t aNameSpaceID, nsIAtom* aName,
     } else if (MaxLengthApplies() && aName == nsGkAtoms::maxlength) {
       UpdateTooLongValidityState();
     } else if (aName == nsGkAtoms::pattern) {
+      // Although pattern attribute only applies to single line text controls,
+      // we set this flag for all input types to save having to check the type
+      // here.
+      mHasPatternAttribute = !!aValue;
       UpdatePatternMismatchValidityState();
     } else if (aName == nsGkAtoms::multiple) {
       UpdateTypeMismatchValidityState();
@@ -6426,8 +6431,7 @@ HTMLInputElement::HasTypeMismatch() const
 bool
 HTMLInputElement::HasPatternMismatch() const
 {
-  if (!DoesPatternApply() ||
-      !HasAttr(kNameSpaceID_None, nsGkAtoms::pattern)) {
+  if (!mHasPatternAttribute || !DoesPatternApply()) {
     return false;
   }
 
diff --git a/dom/html/HTMLInputElement.h b/dom/html/HTMLInputElement.h
index db91879bab..97246518dd 100644
--- a/dom/html/HTMLInputElement.h
+++ b/dom/html/HTMLInputElement.h
@@ -282,6 +282,11 @@ class HTMLInputElement final : public nsGenericHTMLFormElementWithState,
     return mSelectionProperties;
   }
 
+  bool HasPatternAttribute() const
+  {
+    return mHasPatternAttribute;
+  }
+
   // nsIConstraintValidation
   bool     IsTooLong();
   bool     IsValueMissing() const;
@@ -1357,6 +1362,7 @@ class HTMLInputElement final : public nsGenericHTMLFormElementWithState,
   bool                     mNumberControlSpinnerSpinsUp : 1;
   bool                     mPickerRunning : 1;
   bool                     mSelectionCached : 1;
+  bool                     mHasPatternAttribute : 1;
 
 private:
   static void MapAttributesIntoRule(const nsMappedAttributes* aAttributes,