File: img-fallback-baseline-alignment.html

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<!DOCTYPE html>
<meta charset="utf-8">
<title>Image fallback baseline alignment</title>
<link rel="author" href="mailto:zhoupeng.1996@bytedance.com">
<link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#images-3">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  div {
    background: red;
    line-height: 200px;
    width: 100px;
  }
  img {
    border-right: solid 30px black;
    width: 30px;
    height: 30px;
  }
</style>
<body>
  <div>
    <img src="">
  </div>
  <script>
    async_test(t => {
      const img = document.querySelector('img');
      const div = document.querySelector('div');
      img.src = '';
      img.onerror = t.step_func_done(() => {
        assert_greater_than(img.offsetTop, div.offsetTop);
        assert_less_than(img.offsetTop + img.offsetHeight, div.offsetTop + div.offsetHeight);
      });
    });
  </script>
</body>