wpt/css/css-scroll-snap/scroll-padding-focus.html at master · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-padding">
<title>Scroll into view for focus respects scroll padding</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#scroller {
  height: 200px;
  width: 600px;
  margin: 50px;
  scroll-padding: 0 120px;
  scrollbar-width: none;
  overflow: auto;
  border: 1px solid black;
}
.wide {
  width: 2000px;
}
#target {
  width: 100px;
  height: 100px;
  margin: 10px;
  margin-left: 600px;
  background-color: silver;
}
</style>

<div id="scroller">
  <div class="wide">
      <div id="target" tabindex="-1" style="background-color: green"></div>
  </div>
</div>
<div id="other-focus" tabindex="-1">Other focus</div>
<script>
function tick() {
  return new Promise(resolve => {
    requestAnimationFrame(() => requestAnimationFrame(resolve));
  });
}

function reset()
{
  document.getElementById('other-focus').focus();
}

let scroller = document.getElementById("scroller");
promise_test(async t => {
  reset();
  scroller.scrollTo(100, 0);
  await tick();
  const target = document.getElementById("target");
  target.focus();
  await tick(); // Work around WebKit bug.
  assert_equals(scroller.scrollLeft, 350, "Focus should scroll the target from out under the left scrollpadding");
}, 'Avoid left scroll-padding');

promise_test(async t => {
  reset();
  scroller.scrollTo(600, 0);
  await tick();
  const target = document.getElementById("target");
  target.focus();
  await tick(); // Work around WebKit bug.
  assert_equals(scroller.scrollLeft, 350, "Focus should scroll the target from out under the right scrollpadding");
}, 'Avoid right scroll-padding');
</script>