��式错误的语句可能含有异常的右花括号或者@关键字，例如，下列行都会被忽略：

<pre>
p @here {color: red}     /* ruleset with unexpected at-keyword "@here" */
@foo @bar;               /* at-rule with unexpected at-keyword "@bar" */
}} {{ - }}               /* ruleset with unexpected right brace */
) ( {} ) p {color: red } /* ruleset with unexpected right parenthesis */
</pre>



<li><strong>含有未知@关键字的@规则</strong> 用户代理必须<span
class="index-inst" ti