preventScroll-nested-scroll-elements.html

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This WPT test may be referenced by the following Test IDs:
- /html/interaction/focus/processing-model/preventScroll-nested-scroll-elements.html - WPT Dashboard Interop Dashboard

<!doctype html>

<title>focus(options) - preventScroll on nested scroll elements</title>

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

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

<style>

  .scrollBox { width: 400px; height: 300px; border: 1px solid }

  .bigbox { width: 380px; height: 300px; border: 1px solid }

  .box { width: 380px; height: 150px; border: 1px solid }

</style>

<div class="scrollBox" style="overflow-y: scroll;">

  <div class="bigbox" id="1" style="overflow-y: scroll;" tabindex=1>

    <div class="box" id="1_1" tabindex=1>1_1</div>

    <div class="box" id="1_2" tabindex=1>1_2</div>

    <div class="box" id="1_3" tabindex=1>1_3</div>

  </div>

  <div class="bigbox" id="2" style="overflow-y: scroll;" tabindex=1>

    <div class="box" id="2_1" tabindex=1>2_1</div>

    <div class="box" id="2_2" tabindex=1>2_2</div>

    <div class="box" id="2_3" tabindex=1>2_3</div>

  </div>

  <div class="bigbox" id="3" style="overflow-y: scroll;" tabindex=1>

    <div class="box" id="3_1" tabindex=1>3_1</div>

    <div class="box" id="3_2" tabindex=1>3_2</div>

    <div class="box" id="3_3" tabindex=1>3_3</div>

  </div>

</div>

<script>

promise_test(async function(t) {

  await new Promise(resolve => window.addEventListener("load", resolve));

  let div2_2 = document.getElementById("2_2");

  div2_2.focus({ preventScroll: true });

  await new Promise(resolve => {

    requestAnimationFrame(() => requestAnimationFrame(resolve));

});

  assert_equals(document.activeElement, div2_2, `box 2_2: should have been focused`);

  assert_equals(div2_2.scrollTop, 0, "box 2_2: should not have scrolled");

  assert_equals(div2_2.parentNode.scrollTop, 0, "box 2_2: should not have scrolled ancestor");

  // Reset focus

  let div1_1 = document.getElementById("1_1");

  div1_1.focus();

  await new Promise(resolve => {

    requestAnimationFrame(() => requestAnimationFrame(resolve));

});

  assert_equals(document.activeElement, div1_1, `box 1_1: should have been focused`);

  let div2 = document.getElementById("2");

  div2.focus({ preventScroll: true });

  await new Promise(resolve => {

    requestAnimationFrame(() => requestAnimationFrame(resolve));

});

  assert_equals(document.activeElement, div2, `box 2: should have been focused`);

  assert_equals(div2.scrollTop, 0, "box 2: should not have scrolled");

  assert_equals(div2_2.scrollTop, 0, "box 2_2: should not have scrolled");

  assert_equals(div2.parentNode.scrollTop, 0, "box 2: should not have scrolled ancestor");

});

</script>