scroll-behavior-smooth-after-hiding-iframe.html

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This WPT test may be referenced by the following Test IDs:
- /css/cssom-view/scroll-behavior-smooth-after-hiding-iframe.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>cssom-view - scroll-behavior: smooth after hiding iframe</title>

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

<link rel="help" href="https://drafts.csswg.org/cssom-view/#smooth-scrolling">

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

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

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

<style>

  #scroller {

    width: 300px;

    height: 300px;

    overflow-y: scroll;

</style>

<body>

  <div id="scroller">

    <div id="firstTab">

      <iframe srcdoc='<html><style>body { height: 200vh; }</style><body></body></html>'></iframe>

    </div>

    <div id="secondTab" style="display: none">

      <div style="width: 200px; height: 5000px;"></div>

      <div style="width: 100px; height: 100px; background: green;"></div>

    </div>

  </div>

  <script>

    promise_test(async (t) => {

      await waitForCompositorReady();

      // Wait for initial layout/paint

      await waitForCompositorCommit();

      const firstTab = document.getElementById('firstTab');

      const secondTab = document.getElementById('secondTab');

      const scroller = document.getElementById('scroller');

      // Hide first tab

      firstTab.style.display = 'none';

      await waitForCompositorCommit();

      // Show second tab and scroll.

      secondTab.style.display = 'block';

      const scrollEndPromise = new Promise(resolve => {

        scroller.addEventListener('scrollend', resolve, {once: true});

});

      // Smooth scroll to the end.

      scroller.scroll({top: 999999, left: 0, behavior: "smooth" });

      await scrollEndPromise;

      const scrolledToBottom = Math.abs(scroller.scrollHeight - scroller.clientHeight - scroller.scrollTop) < 1;

      assert_true(scrolledToBottom, "Scroller should be at the bottom after scrollend fires. Current scrollTop: " + scroller.scrollTop);

    }, "Smooth scroll finishes correctly after hiding a tab with an iframe");

  </script>

</body>