1 files changed, 76 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/canvas/offscreen/manual/the-offscreen-canvas/offscreencanvas.transfercontrol.to.offscreen.w.html b/testing/web-platform/tests/html/canvas/offscreen/manual/the-offscreen-canvas/offscreencanvas.transfercontrol.to.offscreen.w.html
new file mode 100644
index 0000000000..1347e7b50b
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/manual/the-offscreen-canvas/offscreencanvas.transfercontrol.to.offscreen.w.html
@@ -0,0 +1,76 @@
+<!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 id="myWorker" type="text/worker">
+
+function testSize(offscreenCanvas)
+{
+    if (offscreenCanvas.width == 100 && offscreenCanvas.height == 50)
+        return true;
+    return false;
+}
+
+self.onmessage = function(e) {
+    switch (e.data.msg) {
+        case 'test1':
+            self.postMessage(testSize(e.data.data));
+            break;
+        case 'test2':
+            self.postMessage("");
+            break;
+        case 'test3':
+            self.postMessage("");
+            break;
+    }
+};
+
+</script>
+
+<script>
+function makeWorker(script)
+{
+    var blob = new Blob([script]);
+    return new Worker(URL.createObjectURL(blob));
+}
+
+async_test(function(t) {
+    var placeholder = document.createElement('canvas');
+    placeholder.width = 100;
+    placeholder.height = 50;
+    var offscreenCanvas = placeholder.transferControlToOffscreen();
+    var worker = makeWorker(document.getElementById("myWorker").textContent);
+    worker.addEventListener('message', t.step_func_done(function(msg) {
+        assert_true(msg.data);
+    }));
+    worker.postMessage({msg: 'test1', data: offscreenCanvas}, [offscreenCanvas]);
+}, "Test that an OffscreenCanvas generated by transferControlToOffscreen gets correct width and height when it is transferred to a worker");
+
+async_test(function(t) {
+    var placeholder = document.createElement('canvas');
+    placeholder.width = 100;
+    placeholder.height = 50;
+    var offscreenCanvas = placeholder.transferControlToOffscreen();
+    var worker = makeWorker(document.getElementById("myWorker").textContent);
+    worker.addEventListener('message', t.step_func_done(function(msg) {
+        assert_throws_dom("InvalidStateError", function() { placeholder.getContext('2d'); });
+    }));
+    worker.postMessage({msg: 'test2', data: offscreenCanvas}, [offscreenCanvas]);
+}, "Test that calling getContext on a placeholder canvas that is transferred its control to an OffscreenCanvas throws an exception, when the OffscreenCanvas is transferred to a worker");
+
+async_test(function(t) {
+    var placeholder = document.createElement('canvas');
+    placeholder.width = 100;
+    placeholder.height = 50;
+    var offscreenCanvas = placeholder.transferControlToOffscreen();
+    var worker = makeWorker(document.getElementById("myWorker").textContent);
+    worker.addEventListener('message', t.step_func_done(function(msg) {
+        assert_throws_dom("InvalidStateError", function() { placeholder.transferControlToOffscreen(); });
+    }));
+    worker.postMessage({msg: 'test3', data: offscreenCanvas}, [offscreenCanvas]);
+}, "Test that calling transferControlToOffscreen twice throws an exception, when its associated OffscreenCanvas is transferred to a worker");
+
+</script>
+