[android]内置浏览器fix布局失效问题

[hite]

在Android2.3下，内置浏览器以及webview的页面，fixed position是不支持的； 解决方式：

-webkit-backface-visibility: hidden;

via Easy CSS fix for fixed positioning on Android 2.2 and 2.3

特别的，

Updates

Jelmer Borst has tested a few more devices via DevAnywhere:

LG Thrill and Motorola Droid 2 work well but Samsung Galaxy SII running Android 2.3.6 seems to move and then snap back in place so this doesn’t seem to be the panacea for the problem I had hoped for on all Android devices.