Add tests for fullscreenchange and fullscreenerror event timing

Although HTML does not yet define animation frame tasks as used by Fullscreen, it does have "run the fullscreen rendering steps". That's the old hook, making the timing of these events relative to resize and animation frame callbacks unambiguous: https://fullscreen.spec.whatwg.org/#dom-element-requestfullscreen https://html.spec.whatwg.org/multipage/webappapis.html#event-loop-processing-model Spec issue: whatwg/html#707 document-exit-fullscreen-timing-manual.html consistently matches -expected.txt, with (accidentally) correct timing but no resize event. element-request-fullscreen-timing-manual.html usually matches -expected.txt, with incorrect timing, but can accidentally get the timing right and instead fail due to no resize event. Both are marked as flaky to be safe, and will be enabled in a coming CL. Note: This CL is also a test for the WPT export process. Firefox passes both fullscreechange event tests, but fails the fullscreenerror test. (Implementation preceded spec changes.) BUG=402376,672436 Review-Url: https://codereview.chromium.org/2564543002 Cr-Commit-Position: refs/heads/master@{#437283}
web-platform-tests · Dec 8, 2016 · bde6798 · bde6798
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diff --git a/fullscreen/api/document-exit-fullscreen-timing-manual.html b/fullscreen/api/document-exit-fullscreen-timing-manual.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<title>Document#exitFullscreen() timing</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../trusted-click.js"></script>
+<div id="log"></div>
+<script>
+async_test(t => {
+  const div = document.querySelector('div');
+  trusted_request(div);
+
+  document.onfullscreenchange = t.step_func(() => {
+    // We are now in fullscreen. Exit again.
+    assert_equals(document.fullscreenElement, div);
+    document.exitFullscreen();
+
+    // If fullscreenchange is an animation frame event, then animation frame
+    // callbacks should be run after it is fired, before the timer callback.
+    // The resize event should fire before the fullscreenchange event.
+    const events = [];
+    const callback = t.step_func(event => {
+      events.push(event.type);
+      if (event.type == 'fullscreenchange') {
+        setTimeout(t.unreached_func('timer callback'));
+        requestAnimationFrame(t.step_func_done(() => {
+          assert_array_equals(events, ['resize', 'fullscreenchange'], 'event order');
+        }));
+      }
+    });
+    document.onfullscreenchange = window.onresize = callback;
+  });
+}, 'Timing of fullscreenchange and resize events');
+</script>
diff --git a/fullscreen/api/element-request-fullscreen-timing-manual.html b/fullscreen/api/element-request-fullscreen-timing-manual.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<title>Element#requestFullscreen() timing</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../trusted-click.js"></script>
+<div id="log"></div>
+<script>
+async_test(t => {
+  trusted_request(document.querySelector('div'));
+
+  // If fullscreenchange is an animation frame event, then animation frame
+  // callbacks should be run after it is fired, before the timer callback.
+  // The resize event should fire before the fullscreenchange event.
+  const events = [];
+  const callback = t.step_func(event => {
+    events.push(event.type);
+    if (event.type == 'fullscreenchange') {
+      setTimeout(t.unreached_func('timer callback'));
+      requestAnimationFrame(t.step_func_done(() => {
+        assert_array_equals(events, ['resize', 'fullscreenchange'], 'event order');
+      }));
+    }
+  });
+  document.onfullscreenchange = window.onresize = callback;
+}, 'Timing of fullscreenchange and resize events');
+
+async_test(t => {
+  document.createElement('a').requestFullscreen();
+
+  // If fullscreenerror is an animation frame event, then animation frame
+  // callbacks should be run after it is fired, before the timer callback.
+  document.onfullscreenerror = t.step_func(() => {
+    setTimeout(t.unreached_func('timer callback'));
+    requestAnimationFrame(t.step_func_done());
+  });
+}, 'Timing of fullscreenerror event');
+</script>