LayoutTests/fast/forms/textarea-paste-newline.html - WebKit - Git at Google

 <script>
 function test()
 {
     if (window.testRunner)
         testRunner.dumpAsText();
     var ta = document.getElementById("ta");
     ta.value = "abc\n";
     ta.focus();
     ta.setSelectionRange(0, 4);
     document.execCommand("cut");
     document.execCommand("paste");
     var result1 = ta.value;
     ta.setSelectionRange(0, 0);
     document.execCommand("paste");
     var result2 = ta.value;

     if (result1 == "abc\n" && result2 == "abc\nabc\n")
         document.write("<p>Hooray, the test was successful!</p>");
     else if (result1 == "")
         document.write("<p>The test failed; doesn't work in release builds of Safari because paste is not allowed.</p>");
     else
         document.write("<p>The test failed, result 1 was '" + result1.replace("\n", "\\n") + "' and result 2 was '" + result2.replace("\n", "\\n") + "'.</p>");
 }
 </script>
 <body onload="test()">
 <p><textarea id="ta"></textarea></p>
	<script>
	function test()
	{
	if (window.testRunner)
	testRunner.dumpAsText();
	var ta = document.getElementById("ta");
	ta.value = "abc\n";
	ta.focus();
	ta.setSelectionRange(0, 4);
	document.execCommand("cut");
	document.execCommand("paste");
	var result1 = ta.value;
	ta.setSelectionRange(0, 0);
	document.execCommand("paste");
	var result2 = ta.value;

	if (result1 == "abc\n" && result2 == "abc\nabc\n")
	document.write("<p>Hooray, the test was successful!</p>");
	else if (result1 == "")
	document.write("<p>The test failed; doesn't work in release builds of Safari because paste is not allowed.</p>");
	else
	document.write("<p>The test failed, result 1 was '" + result1.replace("\n", "\\n") + "' and result 2 was '" + result2.replace("\n", "\\n") + "'.</p>");
	}
	</script>
	<body onload="test()">
	<p><textarea id="ta"></textarea></p>