有关将来的参考，请请注意，根据CSS 3文档：

生成的内容应为可搜索，可选并且可用于辅助技术。 content属性适用于语音，生成的内容必须呈现为语音输出。

Generated content should be searchable, selectable, and available to assistive technologies. The content property applies to speech and generated content must be rendered for speech output.

还应指出：

如果伪元素纯粹是装饰性的，并且其功能已在其他地方覆盖，则将alt设置为空字符串可以避免读出装饰性元素。

If the pseudo-element is purely decorative and its function is covered elsewhere, setting alt to the empty string can avoid reading out the decorative element.

这涉及 :: before 和 ::在个伪元素之后； / 之后可能会显示替代文本：

This concernes ::before and ::after pseudo-elements; alternative text might be indicated after a /:

.expandable::before {
  content: "\25BA" / ""; 
}

对于CSS2，您可以使用不可发音的UTF-8元素来确保

For CSS2, you may use unpronounceable UTF-8 elements in order to be sure that the elements won't be announced.

例如，当您使用代码时：

For instance, when you use the code:

.bullet {
    content: "\2022";
}

\2022 （项目符号：•）用NVDA宣布项目符号，而另一个代码，如 \2023 （三角形项目符号：‣）则什么也没有宣布

\2022 (bullet : •) announces "bullet" with NVDA while another code like \2023 (triangular bullet : ‣) announces nothing