css -::before/::after + MDN 中的 flexbox

Question

我在 MDN CSS 上看到以下新闻元素主页:

Gecko's support of flexible boxes has been adapted to match a recent specification clarification: from Firefox 23 ::before and ::after will be flex items, and as such can be repositioned using order and align-self.
(May 3rd, 2013)

指的是什么规范？
我在 CSS Flexible Box Layout Module 中找不到对 ::before/::after 的任何引用.

Answer 1

这是在 bug 867454 中实现的.正如评论 #0 所说，不实现它是一个错误。

spec说:

The contents of a flex container consists of zero or more flex items: each in-flow child of a flex container becomes a flex item, and each contiguous run of text that is directly contained inside a flex container is wrapped in an anonymous flex item.

这确实包括 ::before/::after 伪元素(至少 mozilla 的人现在这样解释它，我同意)。

"Firefox 23 for developers"还具有此信息，明确将 ::before 和 ::after 称为“流入”。

In-flow ::after and ::before pseudo-elements are now flex items (bug 867454).