这是syntaxhighlighter-3.0.83的BUG，会自动删除html、body、head标签吗？

如何解决这是syntaxhighlighter-3.0.83的BUG，会自动删除html、body、head标签吗？

我的 html 代码如下：

<!DOCTYPE html>
<head>
<Meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>SyntaxHighlighter-3.0.83</title>

<link type="text/css" rel="stylesheet" href="./SyntaxHighlighter-3.0.83/styles/shCore.css"/>
<link type="text/css" rel="stylesheet" href="./SyntaxHighlighter-3.0.83/styles/shThemeDefault.css"/>
    
<script type="text/javascript" src="./SyntaxHighlighter-3.0.83/scripts/XRegExp.js"></script>
<script type="text/javascript" src="./SyntaxHighlighter-3.0.83/scripts/shCore.js"></script>
<script type="text/javascript" src="./SyntaxHighlighter-3.0.83/scripts/shBrushXml.js"></script>
<script type="text/javascript">SyntaxHighlighter.all()</script>

</head>
<body>

<p>Is this a BUG in SyntaxHighlighter-3.0.83 ??  </p>
<p>Will auto delete the html,body,head tags ??</p>

<pre name="code" class="brush: html;toolbar: false">

<!DOCTYPE html>
<head>
<Meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>SyntaxHighlighter-3.0.83</title>
</head>
<body>
<p>Is this a BUG in SyntaxHighlighter-3.0.83 ??  </p>
<p>Will auto delete the html,head tags ??</p>
</body>
</html>

</pre>

</body>
</html>

但在浏览器中显示如下jpg。 Syntax Highlighter-3.0.83 似乎自动删除了 html 标签、body 标签和 head 标签。如何显示完整的HTML代码？