window-scroll-promises.html

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This test has a WPT meta file that expects 12 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /css/cssom-view/window-scroll-promises.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Window.scroll* methods returning promises</title>

<meta name="timeout" content="long">

<meta name="viewport" content="width=device-width,initial-scale=1">

<link rel="author" title="Mustaq Ahmed" href="mailto:mustaq@chromium.org">

<link rel="help" href="https://drafts.csswg.org/cssom-view/#extensions-to-the-window-interface">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="/dom/events/scrolling/scroll_support.js"></script>

<style>

  .filler { height: 10000px }

</style>

<div class="filler"></div>

<script>

  "use strict";

  const scroll_methods = ["scroll", "scrollTo", "scrollBy"];

  function reset() {

    window.scrollTo({ top: 0 });

    assert_equals(window.scrollY, 0, "Sanity check starting position");

  promise_setup(async () => {

    await waitForCompositorReady();

});

  for (const scroll_method of scroll_methods) {

    for (const behavior of ["auto", "instant", "smooth"]) {

      const test_label = `Window.${scroll_method}(${behavior})`;

      promise_test(async () => {

        let result = window[scroll_method]({ behavior: behavior });

        assert_true(result instanceof Promise);

      }, `${test_label}: return type`);

      promise_test(async () => {

        reset();

        const offset = 5000;

        let promise = window[scroll_method]({ top: offset, behavior: behavior });

        if (behavior != "smooth") {

          assert_equals(window.scrollY, offset, "Position before await");

        } else {

          assert_true(0 <= window.scrollY && window.scrollY < offset,

                "Position before await");

        await promise;

        assert_equals(window.scrollY, offset, "Position after await");

      }, `${test_label}: promise behavior`);

</script>