Move styleMap attribute from HTMLElement to Element

third_party/WebKit/Source/core/dom/Element.idl

Index: third_party/WebKit/Source/core/dom/Element.idl
diff --git a/third_party/WebKit/Source/core/dom/Element.idl b/third_party/WebKit/Source/core/dom/Element.idl
index 07e6d7aa90489f5b14954851fb6eb6dc062b6769..36e48770690c68ac51efc66921c15b005835a5ef 100644
--- a/third_party/WebKit/Source/core/dom/Element.idl
+++ b/third_party/WebKit/Source/core/dom/Element.idl
@@ -114,6 +114,10 @@ interface Element : Node {
     [RuntimeEnabled=ScrollCustomization] void setApplyScroll(ScrollStateCallback scrollStateCallback, NativeScrollBehavior nativeScrollBehavior);
     [RuntimeEnabled=ScrollCustomization] void setDistributeScroll(ScrollStateCallback scrollStateCallback, NativeScrollBehavior nativeScrollBehavior);
 
+    // Typed OM
+    // https://drafts.css-houdini.org/css-typed-om/#inline-stylepropertymap-objects
+    [RuntimeEnabled=CSSTypedOM] readonly attribute StylePropertyMap styleMap;
+
     // Non-standard API
     [MeasureAs=ElementScrollIntoViewIfNeeded] void scrollIntoViewIfNeeded(optional boolean centerIfNeeded);
     [RaisesException, CallWith=ScriptState, MeasureAs=ElementCreateShadowRoot] ShadowRoot createShadowRoot();