<!DOCTYPE html>
<script src="../../../resources/testharness.js"></script>
<script src="../../../resources/testharnessreport.js"></script>
<script src="../../../resources/gesture-util.js"></script>
<style>
body {
height: 1800px;
}
</style>
<script>
// Compute ScrollableArea::pageStep.
var pageStep = innerHeight * 0.875;
if (navigator.userAgent.indexOf("Mac OS X") >= 0)
pageStep = Math.max(pageStep, innerHeight - 40);
promise_test(async () => {
// Click in the vertical scrollbar track, below the thumb, and hold the
// mouse button down. The animation shouldn't continue past the initial
// page step since the initial page step will take the scrollbar thumb
// under the cursor.
await mouseMoveTo(790, 280);
await mouseDownAt(790, 280);
// TODO(crbug.com/1172003): This needs to be fixed for track autoscrolls.
// Impulse based animations have a longer duration than the default ease
// in/out curve. So when an autoscroll animation is initiated (~250ms
// after the initial mousedown), the animation generated by the initial
// mousedown on the scrollbar track will need to be aborted by the
// cc::ScrollbarController (as the cc::KeyframeModel doesn't allow multiple
// sources animating the scroll offset). As a result, the thumb can be
// anywhere between 0 and pageStep. As long as the thumb doesn't cross the
// pointer location (i.e the offset at pageStep), this test is considered
// successful. (Note that this is not an issue while using the default ease
// in/out curve because the initial mousedown animation would've already
// finished by the time the autoscroll animation is being kicked off)
await waitForAnimationEndTimeBased( () => { return scrollY; } );
assert_true(window.scrollY > 0 && window.scrollY <= pageStep,
"window.scrollY = " + window.scrollY + " ");
}, 'Scrollbar track autoscrolling doesn\'t overshoot cursor.');
</script>
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