overflowy将页面内容隐藏在webkit浏览器中(Chrome和Safari)

I am currently making our website to be supported by all major browsers and I've met a very strange problem - oveflow-y attribute caused my data to be hidden. Below I've got an oversimplified code sample that works in IE and Firfox, but which doesn't work in Safari and Chrome. This is a 100% valid code and I am not sure why it doesn't display properly in webkit browsers. I am currently making our website to be support