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chromium/third_party/blink/web_tests/editing/selection/designmode-no-caret.html 

<!doctype html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../assert_selection.js"></script>
<script>
// We don't set caret automatically when editable document that is entirely
// editable even when no caret is requested programmatically.
//
// Note: WebKit set caret this case, but Bink doesn't since the CL[1].
// [1] https://codereview.chromium.org/14891003
selection_test(
    'abc',
    selection => selection.document.designMode = 'on',
    'abc');
</script>