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chromium/third_party/blink/web_tests/external/wpt/selection/caret/empty-elements.html 

<!DOCTYPE HTML>
<meta charset=utf-8>
<title>Placing selection inside empty elements</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div contenteditable id="host">
  <p><strong id="strong"></strong></p>
</div>
<script>
test( () => {
  const range = document.createRange();

  range.setStart( strong, 0 );
  range.collapse()
  getSelection().removeAllRanges();
  getSelection().addRange( range );

  const selectedRange = getSelection().getRangeAt( 0 );

  assert_equals( selectedRange.startContainer, strong );
  assert_equals( selectedRange.startOffset, 0 );
  assert_equals( selectedRange.endContainer, strong );
  assert_equals( selectedRange.endOffset, 0 );
}, 'Selection can be placed inside the empty element' );
</script>