css中overflow:overlay的特性

内容[溢出]显示滚动条,而且[不溢出]就不显示滚动条 不兼容火狐 下面的是我写的废话: 当你需要的时候会显示滚动条, 他和 [auto] 不同的是, auto 在你内容够放的情况下, 也会显示滚动条, 而这个 [overlay] 的好处呢就是 如果你这个东西够放, 他就不显示滚动条; 如果不够了,他就显示滚动条;

这个在不久将来将兼容大部分浏览器. 还有这个属性在火狐是不兼容的. 这个英文的解释,就苦了一些像我这样的英文菜鸡了.一眼看下去不理解, 要一句一句的读.

overlay is described as:

Content is clipped and scroll bars are added when necessary.
Importantly its also said only to work in Safari or Chrome (ie
WebKit).

This item on WebKit bugzilla suggest it is not long for this world in
any case:

WebKit currently has a proprietary CSS overflow value called "overlay"
which is undocumented and as far as I can > tell from reading the code
works exactly like "auto".

We should either remove it or rename it to "-webkit-overlay".

Overflow: overlay doesn't work in firefox