关于png 图片在ie9下有锯齿的问题。

Question

1.png 图片在ie9下有锯齿。 2.我给一个元素加渐变效果，渐变做了兼容性在ie9下也没有显示。渐变代码：background: -moz-linear-gradient(top, #33a1e6, #4272d7);         background: -ms-linear-gradient(top, #33a1e6, #4272d7);         background: -o-linear-gradient(top, #33a1e6, #4272d7);         background: -webkit-gradient(linear, center top, center bottom, from(#33a1e6), to(#4272d7));         background: -webkit-linear-gradient(top, #33a1e6, #4272d7);         background: linear-gradient(top, #33a1e6, #4272d7);          -moz-background-clip: padding;          -webkit-background-clip: padding-box;         background-clip: padding-box;