css/cssom-view/scrollIntoView-nearest-visible-element.html

<!DOCTYPE html>
<html>
<head>
  <title>scrollIntoView nearest shouldn't scroll a completely visible element</title>
  <link rel="author" title="Jo Steven Novaryo" href="mailto:steven.novaryo@gmail.com">
  <link rel="help" href="https://drafts.csswg.org/cssom-view/#determine-the-scroll-into-view-position">
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
</head>

<style>
#container {
  width: 300px;
  height: 300px;
  overflow: scroll;
}

#target {
  width: 100px;
  height: 100px;
  position: relative;
  top: 600px;
  left: 800px;
  background-color: aqua;
}

#overflowing {
  width: 3000px;
  height: 3000px;
}
</style>

<div id="container">
  <div id="target">
  </div>
  <div id="overflowing"></div>
</div>

<script>
  test(function() {
    container.scrollTop = 500;
    container.scrollLeft = 700;
    let initial_target_rect = target.getBoundingClientRect();
    target.scrollIntoView({block: 'nearest', inline: 'nearest'});

    let final_target_rect = target.getBoundingClientRect();
    assert_equals(initial_target_rect.x, final_target_rect.x, 'Target x position remain unchanged');
    assert_equals(initial_target_rect.y, final_target_rect.y, 'Target y position remain unchanged');
  }, "scrollIntoView with `nearest` block and inline option shouldn't scroll a completely visible element");
</script>
</html>