Represents an element with the att attribute whose value is a white space-separated list of words, one of which is exactly "val".

当元素的“att ”属性值是一个以空格分割的“字”的列表，并且其中之一为“val ”，匹配成功。

youdao

Match when the element sets the "att" attribute, whatever the value of the attribute.

当元素设置了"att"属性时匹配成功，而不论属性值是什么。

youdao

Match when the element sets the "att" attribute, whatever the value of the attribute.

当元素设置了"att"属性时匹配成功，而不论属性值是什么。

youdao