CKEditor bug #11544 demo

See https://dev.ckeditor.com/ticket/11544

HTML

<script src="http://ckeditor.com/apps/ckeditor/4.3.2/ckeditor.js"></script>
<h1 class="samples">#11544</h1>
<form action="sample_posteddata.php" method="post">
  <textarea cols="80" id="editor1" name="editor1" rows="10">&lt;!DOCTYPE html> &lt;html> &lt;head> &lt;meta charset="utf-8"> &lt;title>foo [[bar]] foo&lt;/title>&lt;/head> &lt;body>foo [[bar]] foo&lt;/body> &lt;/html></textarea>
</form>
<script>
CKEDITOR.replace('editor1', {
  fullPage: true,
  extraPlugins: 'placeholder'
});
</script>