chromium/src/third_party/blink/renderer/core/testing/data/selection_readonly.html - manifest_repos/chromium_src - Git at Google

 <input id="readonly-input" type="text" value="This text should be selected." readonly>
 <script>
 var input = document.getElementById('readonly-input');
 input.select();
 </script>
	<input id="readonly-input" type="text" value="This text should be selected." readonly>
	<script>
	var input = document.getElementById('readonly-input');
	input.select();
	</script>