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if-and-only-if element

I 开头单词

常见例句

    双语例句

  • Only one pseudo-element may appear per selector, and if present it must appear after the sequence of simple selectors that represents the subjects of the selector.
    一个选择器只能使用一个伪元素，并且伪元素必须处于选择器语句的最后。
    • 返回 if-and-only-if element