From e21d42c2087605afe28c6527f3d8e3b562591cdb Mon Sep 17 00:00:00 2001
From: ExE Boss <3889017+ExE-Boss@users.noreply.github.com>
Date: Wed, 10 Mar 2021 15:00:00 +0100
Subject: [PATCH] =?UTF-8?q?[WebIDL]=20Test=C2=A0subclassing=20of=C2=A0lega?=
 =?UTF-8?q?cy=C2=A0factory=C2=A0functions?=
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---
 .../legacy-factor-function-subclass.window.js       | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 WebIDL/ecmascript-binding/legacy-factor-function-subclass.window.js

diff --git a/WebIDL/ecmascript-binding/legacy-factor-function-subclass.window.js b/WebIDL/ecmascript-binding/legacy-factor-function-subclass.window.js
new file mode 100644
index 00000000000000..1fd64f41bb2e8e
--- /dev/null
+++ b/WebIDL/ecmascript-binding/legacy-factor-function-subclass.window.js
@@ -0,0 +1,13 @@
+"use strict";
+
+test(() => {
+  class CustomImage extends Image {}
+  var instance = new CustomImage();
+
+  assert_equals(
+    Object.getPrototypeOf(instance), CustomImage.prototype,
+    "Object.getPrototypeOf(instance) === CustomImage.prototype");
+
+  assert_true(instance instanceof CustomImage, "instance instanceof CustomImage");
+  assert_true(instance instanceof HTMLImageElement, "instance instanceof HTMLImageElement");
+}, "[LegacyFactoryFunction] can be subclassed and correctly handles NewTarget");