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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=904810
+-->
+<head>
+ <title>Test for Bug 904810</title>
+ <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+ <script type="text/javascript" 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=904810">Mozilla Bug 904810</a>
+<p id="display">
+<textarea dir="ltr" id="textarea904810">
+first line
+second line
+third line
+</textarea></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 904810 **/
+
+SimpleTest.waitForExplicitFinish();
+
+// We intermittently trigger two "Wrong parent style context" assertions
+// on B2G emulator builds (bug XXXXXXX). The two frames that get incorrect
+// style context parents are scroll bar parts in the <textarea>.
+SimpleTest.expectAssertions(0, 2);
+
+SimpleTest.waitForFocus(function test() {
+ function shiftLeft(i) {
+ for ( ; i > 0; --i)
+ synthesizeKey("VK_LEFT", {shiftKey:true});
+ }
+
+ function shiftRight(i) {
+ for ( ; i > 0; --i)
+ synthesizeKey("VK_RIGHT", {shiftKey:true});
+ }
+
+ const isWindows = /WINNT/.test(SpecialPowers.OS);
+
+ var textarea = document.getElementById('textarea904810');
+ textarea.focus();
+
+ // Testing VK_DOWN with forward selection
+ textarea.selectionStart = 1;
+ textarea.selectionEnd = 1;
+ shiftRight(7);
+ synthesizeKey("VK_DOWN", {});
+ if (isWindows) {
+ is(textarea.selectionStart, 19, "caret moved to next line below selection end");
+ is(textarea.selectionEnd, 19, "caret moved to next line below selection end");
+ } else {
+ is(textarea.selectionStart, 8, "caret moved to visual end of selection");
+ is(textarea.selectionEnd, 8, "caret moved to visual end of selection");
+ }
+
+ // Testing VK_DOWN with backward selection
+ textarea.selectionStart = 8;
+ textarea.selectionEnd = 8;
+ shiftLeft(7);
+ synthesizeKey("VK_DOWN", {});
+ if (isWindows) {
+ is(textarea.selectionStart, 12, "caret moved to next line below selection start");
+ is(textarea.selectionEnd, 12, "caret moved to next line below selection start");
+ } else {
+ is(textarea.selectionStart, 8, "caret moved to visual end of selection");
+ is(textarea.selectionEnd, 8, "caret moved to visual end of selection");
+ }
+
+ // Testing VK_UP with forward selection
+ textarea.selectionStart = 12;
+ textarea.selectionEnd = 12;
+ shiftRight(7);
+ synthesizeKey("VK_UP", {});
+ var result = textarea.selectionEnd
+ if (isWindows) {
+ is(textarea.selectionStart, 8, "caret moved to previous line above selection end");
+ is(textarea.selectionEnd, 8, "caret moved to previous line above selection end");
+ } else {
+ is(textarea.selectionStart, 12, "caret moved to visual start of selection");
+ is(textarea.selectionEnd, 12, "caret moved to visual start of selection");
+ }
+
+ // Testing VK_UP with backward selection
+ textarea.selectionStart = 19;
+ textarea.selectionEnd = 19;
+ shiftLeft(7);
+ synthesizeKey("VK_UP", {});
+ var result = textarea.selectionEnd
+ if (isWindows) {
+ is(textarea.selectionStart, 1, "caret moved to previous line above selection start");
+ is(textarea.selectionEnd, 1, "caret moved to previous line above selection start");
+ } else {
+ is(textarea.selectionStart, 12, "caret moved to visual start of selection");
+ is(textarea.selectionEnd, 12, "caret moved to visual start of selection");
+ }
+
+
+
+ SimpleTest.finish();
+});
+</script>
+</pre>
+</body>
+</html>