chromium/third_party/blink/web_tests/editing/pasteboard/mixed_editability.html

<!doctype html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../assert_selection.js"></script>
<script>
function mouseMoveTo(selection, element) {
    const mouseX = selection.document.offsetLeft + element.offsetLeft + element.offsetWidth / 2;
    const mouseY = selection.document.offsetTop + element.offsetTop + element.offsetHeight / 2;
    eventSender.mouseMoveTo(mouseX, mouseY);
}

test(() => {
  assert_not_equals(window.testRunner, 'This test requires clipboard access.');
  assert_selection(
    [
      '<div contenteditable id="src">',
        '^foo <span contenteditable="false">bar</span> baz|',
      '</div>',
      '<div contenteditable id="dest"></div>'
    ].join(''),
    selection => {
      mouseMoveTo(selection, selection.document.getElementById('src'));
      eventSender.mouseDown();
      eventSender.leapForward(500);
      mouseMoveTo(selection, selection.document.getElementById('dest'));
      eventSender.mouseUp();
    },
    [
      '<div contenteditable id="src"></div>',
      '<div contenteditable id="dest">',
        '^foo\u00A0<span contenteditable="false">bar</span>\u00A0baz|',
      '</div>'
    ].join('')
  );
}, 'Dropping content with mixed editability does not change editability');

test(() => {
  assert_not_equals(window.testRunner, 'This test requires clipboard access.');
  assert_selection(
    [
      '<div contenteditable id="src">',
        '^foo <span contenteditable="false">bar</span> baz|',
      '</div>',
      '<div contenteditable id="dest"></div>'
    ].join(''),
    selection => {
      selection.document.execCommand('copy');
      selection.document.getElementById('dest').focus();
      selection.document.execCommand('paste');
    },
    [
      '<div contenteditable id="src">',
        'foo <span contenteditable="false">bar</span> baz',
      '</div>',
      '<div contenteditable id="dest">',
        'foo\u00A0<span contenteditable="false">bar</span>\u00A0baz|',
      '</div>'
    ].join('')
  );
}, 'Pasting content with mixed editability does not change editability');
</script>