什么浏览器支持`overflow-y'？
从我的理解， overflow-y 是一个CSS3选择器。但是在 http://www.findmebyip.com/litmus ，它没有显示该选择器，显示我不知道什么浏览器支持它。
From what I understand, overflow-y is a CSS3 selector. But at http://www.findmebyip.com/litmus, it doesn't have that selector shown, show I don't know what browsers support it.
首先是 overflow-y 和 overflow-x 实际上是CSS3选择器？
First, are overflow-y and overflow-x actually CSS3 selectors?
其次，什么浏览器支持它们？
Second, what browsers support them?
不，overflow-x和y不是CSS3选择器。它们只是属性，类似于 overflow 但有方向限制。
No, overflow-x and y are not CSS3 selectors. They are simply properties, similar to overflow but with direction restrictions.
从http://reference.sitepoint.com/css/overflow
部分支持CSS3 overflow-x和overflow-y
属性Windows版本的Internet Explorer版本
5和6，完全支持
Internet Explorer版本7& 8.
Safari 3+，Chrome 2+，Firefox 2+和
Opera 9.5+都支持这些
属性。
The CSS3 overflow-x and overflow-y properties are partially supported in Internet Explorer for windows versions 5 and 6 and fully supported in Internet Explorer versions 7 & 8. Safari 3+, Chrome 2+, Firefox 2+ and Opera 9.5+ all support these properties.