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chromium/third_party/blink/web_tests/external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/legend-margin-inline.html 

<!doctype html>
<title>legend and margin (inline direction)</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<style>
 fieldset { margin: 0 0 10px 0; padding: 20px; border: 10px solid; width: 500px; }
 legend { height: 10px; width: 200px; padding: 0; }

 #legend-center { margin-left: auto; margin-right: auto; }
 #legend-right { margin-left: auto; }
 #legend-10 { margin-left: 10px; }
</style>
<fieldset>
  <legend id=legend-left>left</legend>
</fieldset>
<fieldset>
  <legend id=legend-center>center</legend>
</fieldset>
<fieldset>
  <legend id=legend-right>right</legend>
</fieldset>
<fieldset>
  <legend id=legend-10>10px</legend>
</fieldset>

<script>
 const legends = document.getElementsByTagName('legend');
 const [legendLeft, legendCenter, legendRight, legend10] = legends;

 const expectedLeft = 8 + 10 + 20;
 const expectedCenter = expectedLeft + (500 / 2) - (200 / 2);
 const expectedRight = expectedLeft + 500 - 200;
 const expected10 = expectedLeft + 10;

 test(() => {
   assert_equals(legendLeft.offsetLeft, expectedLeft);
 }, 'left');

 test(() => {
   assert_equals(legendCenter.offsetLeft, expectedCenter);
 }, 'center');

 test(() => {
   assert_equals(legendRight.offsetLeft, expectedRight);
 }, 'right');

 test(() => {
   assert_equals(legend10.offsetLeft, expected10);
 }, '10px');
</script>