File: scroll-button-focus-active-element.html

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<!doctype html>
<meta charset="utf-8">
<title>CSS Test: document.activeElement for ::scroll-button is scroller</title>
<link rel="help" href="https://drafts.csswg.org/css-overflow-5/#scroll-buttons">
<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>
<style>
  body {
    margin: 0;
  }

  #scroller {
    width: 600px;
    height: 300px;
    overflow: auto;
    white-space: nowrap;
  }

  #scroller div {
    display: inline-block;
    width: 600px;
    height: 270px;
  }

  #scroller::scroll-button(right) {
    content: ">";
    width: 100px;
    height: 20px;
    background-color: blue;
  }
</style>
<div id="scroller">
  <div></div>
  <div></div>
</div>
<script>
  promise_test(async t => {
    await new test_driver.Actions()
      .pointerMove(15, 310)
      .pointerDown()
      .pointerUp()
      .send();
    assert_equals(document.activeElement, scroller, "document.activeElement for ::scroll-button is scroller");
  });
</script>