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chromium/third_party/blink/web_tests/external/wpt/selection/contenteditable/cefalse-on-boundaries.html 

<!DOCTYPE HTML>
<meta charset=utf-8>
<title>Selection of contenteditable=false at the beginning and end of contenteditable element</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div contenteditable id="host">
  <div contenteditable="false" id="beginning">&nbsp;</div>
  <p id="paragraph">Lorem ipsum dolor sit amet.</p>
  <div contenteditable="false" id="end">&nbsp;</div>
</div>
<script>
test( () => {
  const range = document.createRange();

  range.setStartBefore( beginning );
  range.setEndAfter( paragraph );
  getSelection().removeAllRanges();
  getSelection().addRange( range );

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

  assert_equals( selectedRange.startContainer, host );
  assert_equals( selectedRange.startOffset, 1 );
  assert_equals( selectedRange.endContainer, host );
  assert_equals( selectedRange.endOffset, 4 );
}, 'Selection can start on cE=false element at the beginning of the cE=true element' );

test( () => {
  const range = document.createRange();

  range.setStartBefore( paragraph );
  range.setEndAfter( end );
  getSelection().removeAllRanges();
  getSelection().addRange( range );

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

  assert_equals( selectedRange.startContainer, host );
  assert_equals( selectedRange.startOffset, 3 );
  assert_equals( selectedRange.endContainer, host );
  assert_equals( selectedRange.endOffset, 6 );
}, 'Selection can end on cE=false element at the end of the cE=true element' );

test( () => {
  const range = document.createRange();

  range.setStartBefore( beginning );
  range.setEndAfter( end );
  getSelection().removeAllRanges();
  getSelection().addRange( range );

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

  assert_equals( selectedRange.startContainer, host );
  assert_equals( selectedRange.startOffset, 1 );
  assert_equals( selectedRange.endContainer, host );
  assert_equals( selectedRange.endOffset, 6 );
}, 'Selection can start and end on cE=false elements at the boundaries of cE=true element' );

test( () => {
  const range = document.createRange();

  range.selectNodeContents( host );

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

  assert_equals( selectedRange.startContainer, host );
  assert_equals( selectedRange.startOffset, 1 );
  assert_equals( selectedRange.endContainer, host );
  assert_equals( selectedRange.endOffset, 6 );
}, 'Range#selectNodeContents() correctly select contents of cE=true element with cE=false elements on boundaries' );
</script>