1 files changed, 34 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/canvas/offscreen/manual/the-offscreen-canvas/offscreencanvas.transfercontrol.to.offscreen.html b/testing/web-platform/tests/html/canvas/offscreen/manual/the-offscreen-canvas/offscreencanvas.transfercontrol.to.offscreen.html
new file mode 100644
index 0000000000..fea375b2ad
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/manual/the-offscreen-canvas/offscreencanvas.transfercontrol.to.offscreen.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+<link rel="help" href="https://html.spec.whatwg.org/#dom-canvas-transfercontroltooffscreen">
+<script>
+
+test(function() {
+    var placeholder = document.createElement('canvas');
+    placeholder.width = 100;
+    placeholder.height = 50;
+    var offscreenCanvas = placeholder.transferControlToOffscreen();
+    assert_equals(offscreenCanvas.width, 100);
+    assert_equals(offscreenCanvas.height, 50);
+}, "Test that an OffscreenCanvas generated by transferControlToOffscreen gets correct width and height");
+
+test(function() {
+    var placeholder = document.createElement('canvas');
+    placeholder.width = 100;
+    placeholder.height = 50;
+    var offscreenCanvas = placeholder.transferControlToOffscreen();
+    assert_throws_dom("InvalidStateError", function() { placeholder.getContext('2d'); });
+}, "Test that calling getContext on a placeholder canvas that has already transferred its control throws an exception");
+
+test(function() {
+    var placeholder = document.createElement('canvas');
+    placeholder.width = 100;
+    placeholder.height = 50;
+    var offscreenCanvas = placeholder.transferControlToOffscreen();
+    assert_throws_dom("InvalidStateError", function() { placeholder.transferControlToOffscreen(); });
+}, "Test that calling transferControlToOffscreen twice throws an exception");
+
+</script>
+