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-rw-r--r--testing/web-platform/tests/dom/events/scrolling/overscroll-event-fired-to-element-with-overscroll-behavior.html92
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diff --git a/testing/web-platform/tests/dom/events/scrolling/overscroll-event-fired-to-element-with-overscroll-behavior.html b/testing/web-platform/tests/dom/events/scrolling/overscroll-event-fired-to-element-with-overscroll-behavior.html
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--- /dev/null
+++ b/testing/web-platform/tests/dom/events/scrolling/overscroll-event-fired-to-element-with-overscroll-behavior.html
@@ -0,0 +1,92 @@
+<!DOCTYPE HTML>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="scroll_support.js"></script>
+<style>
+#overscrollXDiv {
+ width: 600px;
+ height: 600px;
+ overflow: scroll;
+ overscroll-behavior-x: contain;
+}
+#overscrollYDiv {
+ width: 500px;
+ height: 500px;
+ overflow: scroll;
+ overscroll-behavior-y: none;
+}
+#targetDiv {
+ width: 400px;
+ height: 400px;
+ overflow: scroll;
+}
+.content {
+ width:800px;
+ height:800px;
+}
+</style>
+
+<body style="margin:0" onload=runTest()>
+<div id="overscrollXDiv">
+ <div class=content>
+ <div id="overscrollYDiv">
+ <div class=content>
+ <div id="targetDiv">
+ <div class="content">
+ </div>
+ </div>
+ </div>
+ </div>
+ </div>
+</div>
+</body>
+
+<script>
+var target_div = document.getElementById('targetDiv');
+var overscrolled_x_delta = 0;
+var overscrolled_y_delta = 0;
+function onOverscrollX(event) {
+ assert_false(event.cancelable);
+ assert_false(event.bubbles);
+ overscrolled_x_delta = event.deltaX;
+}
+function onOverscrollY(event) {
+ assert_false(event.cancelable);
+ assert_false(event.bubbles);
+ overscrolled_y_delta = event.deltaY;
+}
+// Test that both "onoverscroll" and addEventListener("overscroll"... work.
+document.getElementById('overscrollXDiv').onoverscroll = onOverscrollX;
+document.getElementById('overscrollYDiv').
+ addEventListener("overscroll", onOverscrollY);
+
+function runTest() {
+ promise_test (async (t) => {
+ // Make sure that no overscroll event is sent to document or target_div.
+ document.addEventListener("overscroll",
+ t.unreached_func("Document got unexpected overscroll event."));
+ target_div.addEventListener("overscroll",
+ t.unreached_func("target_div got unexpected overscroll event."));
+ await waitForCompositorCommit();
+ // Scroll up on target div and wait for the element with overscroll-y to get
+ // overscroll event.
+ await touchScrollInTarget(300, target_div, 'up');
+ await waitFor(() => { return overscrolled_y_delta < 0; },
+ 'Expected element did not receive overscroll event after scroll up on ' +
+ 'target.');
+ assert_equals(target_div.scrollTop, 0);
+
+ // Scroll left on target div and wait for the element with overscroll-x to
+ // get overscroll event.
+ await touchScrollInTarget(300, target_div, 'left');
+ await waitFor(() => { return overscrolled_x_delta < 0; },
+ 'Expected element did not receive overscroll event after scroll left ' +
+ 'on target.');
+ assert_equals(target_div.scrollLeft, 0);
+ }, 'Tests that the last element in the cut scroll chain gets overscroll ' +
+ 'event when no element scrolls by touch.');
+}
+</script>