getComputedStyle-z-index-inherit.html

<!DOCTYPE html>
<script src="../../../resources/testharness.js"></script>
<script src="../../../resources/testharnessreport.js"></script>

<style>
#auto {
  z-index: auto;
  opacity: 0.9;
}

#one {
  z-index: 1;
}

#inheritAuto, #inheritOne {
  position: relative;
  z-index: inherit;
}
</style>

<div id="auto">
    <div id="inheritAuto"></div>
</div>

<div id="one">
    <div id="inheritOne"></div>
</div>

<script>
test(() => {
  assert_equals(getComputedStyle(inheritAuto).zIndex, 'auto');
  assert_equals(getComputedStyle(inheritOne).zIndex, '1');
}, 'z-index should inherit the computed value');
</script>

chromium/third_party/blink/web_tests/fast/css/getComputedStyle/getComputedStyle-z-index-inherit.html