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chromium/third_party/blink/web_tests/wpt_internal/css/css-fonts/font-size-adjust-with-zoom.html 

<!doctype html>
<meta charset="utf-8">
<title>CSS Fonts Test: font-size-adjust and page zoom</title>
<link rel="help" href="https://drafts.csswg.org/css-fonts/#propdef-font-size-adjust">
<link rel="stylesheet" herf="/fonts/ahem.css">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<meta name="flags" content="ahem">
<style>
  div {
    font-family: Ahem;
    font-size: 100px;
    /* font-size-adjust:1.0 should give a used font which has 1ex equal to the
       original font-size. */
    font-size-adjust: 1.0;
    width: 1ex;
  }
</style>
<div id="testDiv"></div>
<script>
  test(() => {
    assert_equals(getComputedStyle(testDiv).width, "100px");
  }, "1ex equal to the original font-size.");

  test(() => {
    assert_true(window.testRunner instanceof Object,
                'window.testRunner is required for this test.');
    testRunner.setPageZoomFactor(2);
    assert_equals(getComputedStyle(testDiv).width, "100px");
  }, "1ex equal to the original font-size - 200% page zoom.");
</script>