File: offsetTop-offsetLeft-nested-offsetParents.html

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<!DOCTYPE html>
<link rel=author href="mailto:jarhar@chromium.org">
<link rel=help href="https://drafts.csswg.org/cssom-view-1/#dom-htmlelement-offsettop">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<style>
.square {
  width: 10px;
  height: 10px;
  background-color: red;
}
#one {
  position: absolute;
  top: 10px;
  left: 10px;
}
#two {
  position: absolute;
  top: 50px;
  left: 50px;
}
span.square {
  display: inline-block;
}
</style>

<div id=one class=square>
  <div id=two class=square>
    <div class=square></div>
    <span class=square></span><span id=target></span>
  </div>
</div>

<script>
test(() => {
  assert_equals(target.offsetTop, 10, 'target.offsetTop');
  assert_equals(target.offsetLeft, 10, 'target.offsetLeft');
}, 'Verifies that offsetTop and offsetLeft only go up one offsetParent when there are multiple nested offsetParents.');
</script>