Bug 1632580 [wpt PR 23207] - Update interfaces/fullscreen.idl, a=testonly

Automatic update from web-platform-tests
Update interfaces/fullscreen.idl (#23207)

Includes necessary idlharness.js updates for
https://github.com/web-platform-tests/wpt/issues/23148

Closes https://github.com/web-platform-tests/wpt/pull/23128
--

wpt-commits: 7b4b5b84caae9e748eb13fda010d48a6a874e5a4
wpt-pr: 23207

testing/web-platform/tests/interfaces/fullscreen.idl

@@ -21,8 +21,8 @@ partial interface Element {
 };
 
 partial interface Document {
-  [LenientSetter] readonly attribute boolean fullscreenEnabled;
-  [LenientSetter, Unscopable] readonly attribute boolean fullscreen; // historical
+  [LegacyLenientSetter] readonly attribute boolean fullscreenEnabled;
+  [LegacyLenientSetter, Unscopable] readonly attribute boolean fullscreen; // historical
 
   Promise<void> exitFullscreen();
 
@@ -31,5 +31,5 @@ partial interface Document {
 };
 
 partial interface mixin DocumentOrShadowRoot {
-  [LenientSetter] readonly attribute Element? fullscreenElement;
+  [LegacyLenientSetter] readonly attribute Element? fullscreenElement;
 };

testing/web-platform/tests/resources/idlharness.js

@@ -3088,6 +3088,7 @@ IdlInterface.prototype.do_interface_attribute_asserts = function(obj, member, a_
     // TypeError in most cases).
     if (member.readonly
     && !member.has_extended_attribute("LenientSetter")
+    && !member.has_extended_attribute("LegacyLenientSetter")
     && !member.has_extended_attribute("PutForwards")
     && !member.has_extended_attribute("Replaceable"))
     {