test_bug468167.html

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<!DOCTYPE HTML>

<html>

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=468167

-->

<head>

  <title>Test for Bug 468167</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <script src="/tests/SimpleTest/EventUtils.js"></script>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>

</head>

<body>

<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=468167">Mozilla Bug 468167</a>

<p id="display">

<textarea id="ta" rows="10" cols="80"></textarea>

</p>

<pre id="test">

<script type="application/javascript">

/** Test for Bug 468167 **/

SimpleTest.waitForExplicitFinish();

SimpleTest.waitForFocus(runTests);

function runTests()

  var ta = document.getElementById("ta");

  ta.focus();

  is(ta.scrollTop, 0, "initially scrolled to top");

  var s = "";

  for (var i = 0; i < 40; ++i) {

    // three characters per line

    if (i < 10)

      s += "0";

    s += i + "\n";

  ta.value = s;

  is(ta.scrollTop, 0, "scrolled to top after adding content");

  ta.scrollTop = 9999; // scroll down as far as we can

  isnot(ta.scrollTop, 0, "scrolled down after scrolling down");

  ta.setSelectionRange(0, 99); // 33 lines out of 40

  // Send a backspace key event to delete the selection

  synthesizeKey("KEY_Backspace");

  is(ta.scrollTop, 0, "scrolled to top after deleting selection");

  SimpleTest.finish();

</script>

</pre>

</body>

</html>