illegal-example">
h1 { color: red; rotation: 70minutes }
</pre>

<p>用户代理将把样式表当作
</p>
<pre class="example"><code class="css">
h1 { color: red }
</code></pre>
</li>
<li id="illegalvalues"><strong>非法值</strong> 用户代理必须忽略含有非法值的声明，例如：

<pre class="illegal-example"><code>
img { float: left }       /* correct CSS&nbsp;2.1 */
img { float: left here }  /* "here" is not a value of 'float' */
img { background: "red" } /* keywords cannot be quoted */
img