怎么是||CSS中使用的运算符？-Howisthe||operatorusedinCSS?

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CSS level 4 does in fact have a column operator (used to select table cells of a column).

事实上CSS级别4确实有一个列运算符（用于选择列的表格单元格）。

No idea if that's related and the token was added to CSS3 to be forward-compatile - it would be strange, but then the naming does not sound coincidental. The argument for the new token was indeed parsing convenience:

不知道是否相关并且令牌被添加到CSS3以进行前向兼容 - 这会很奇怪，但是命名听起来并不巧合。新令牌的参数确实解析了方便性：

I just added a COLUMN token to the Syntax draft, matching "||". It's needed for Selectors, so it can maintain LL(1). (Otherwise, seeing "*" followed by "|" is ambiguous until you look at the next token.)

我刚刚在语法草稿中添加了一个COLUMN标记，匹配“||”。选择器需要它，因此它可以保持LL（1）。 （否则，看到“*”后跟“|”是不明确的，直到你查看下一个标记。）

Which I admit I don't quite understand. What else could *| be interpreted as, even in CSS4? There is no other valid use of | in a selector (except inside an attribute matcher, but there there is no valid use for ||). CSS4 Values uses both *, | and || but that's not the spec the email was referring to.

我承认我不太明白。还有什么可以* |被解释为，即使在CSS4？没有其他有效的使用|在选择器中（属性匹配器内部除外，但是||没有有效用途）。 CSS4值使用*，|和||但这不是电子邮件所指的规范。

0  

This is not strictly a CSS3 feature, column-token is just one of many tokens used to parse currently interpreted CSS stylesheet by CSS parser. So it has no use for you unless you're implementing a CSS parser.

这不是严格意义上的CSS3功能，column-token只是用于解析CSS解析器当前解释的CSS样式表的许多令牌之一。因此，除非您正在实现CSS解析器，否则它对您没用。