user-select-none-effect-clipboard-data.html

<!doctype html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../assert_selection.js"></script>
<script>
selection_test(
    [
        '<span>^abc</span>',
        '<span style="user-select: none;">def</span>',
        '<span>ghi</span>',
        '<text  style="user-select: none;" contenteditable>jkl</text>',
        '<span style="user-select: none;">mno|</span>',
        '<input type="text">'
    ],
    selection=> {
        selection.document.execCommand('copy');
        const input = selection.document.querySelector('input');
        input.focus();
        selection.document.execCommand('paste');
        // copy should respect the user-select attribute
        assert_equals(input.value, "abcghijkl");
      },
    [
        '<span>abc</span>',
        '<span style="user-select: none;">def</span>',
        '<span>ghi</span>',
        '<text contenteditable style="user-select: none;">jkl</text>',
        '<span style="user-select: none;">mno</span>',
        '|<input type="text">'
    ],
    'clipboard should respect the user-select attribute.');
</script>

chromium/third_party/blink/web_tests/editing/selection/user-select-none-effect-clipboard-data.html