css/css-nesting/nested-error-recovery.html

<!DOCTYPE html>
<title>CSS Nesting: Error recovery</title>
<link rel="help" href="https://drafts.csswg.org/css-nesting-1">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  html {
    z-index: 0;

    error3234 {**** ::}

    #test1 {
      @media screen {
        z-index: 1;
      }
    }

    { whatever }

    :doesntexist {z-index: 9;}

    #test2 {
      z-index: 2;
    }

    #test3 {
      z-index: 3;
      @media screen {
        error3234;
        { foo }
        z-index:4;
      }
      { foo }
      z-index: 5;
    }

  }
</style>

<div id=test1></div>
<div id=test2></div>
<div id=test3></div>

<script>
  test(() => {
    assert_equals(getComputedStyle(document.documentElement).zIndex, '0');
  });
  test(() => {
    assert_equals(getComputedStyle(document.getElementById("test1")).zIndex, '1');
  });
  test(() => {
    assert_equals(getComputedStyle(document.getElementById("test2")).zIndex, '2');
  });
  test(() => {
    assert_equals(getComputedStyle(document.getElementById("test3")).zIndex, '5');
  });
</script>