这篇文章需要技术复核。如何帮忙。
我们的志愿者还没有将这篇文章翻译为 中文 (简体)。加入我们帮助完成翻译！
In CSS, a pseudo-element selector applies styles to parts of your document content in scenarios where there isn't a specific HTML element to select. For example, rather than putting the first letter of each paragraph in its own element, you can style them all with p::first-letter.