个人问题答案记录文档，写在这里，一是写给健忘的自己，二是可以分享给需要的朋友。
1.背景图片和css3渐变可以同时使用吗？Is it possible to combine a background image and CSS3 gradients?
background: #6cab26; background-image: url(IMAGE_URL); /* fallback */ background-image: url(IMAGE_URL), -webkit-gradient(linear, left top, left bottom, from(#6cab26), to(#6ceb86)); /* Saf4+, Chrome */ background-image: url(IMAGE_URL), -webkit-linear-gradient(top, #6cab26, #6ceb86); /* Chrome 10+, Saf5.1+ */ background-image: url(IMAGE_URL), -moz-linear-gradient(top, #6cab26, #6ceb86); /* FF3.6+ */ background-image: url(IMAGE_URL), -ms-linear-gradient(top, #6cab26, #6ceb86); /* IE10 */ background-image: url(IMAGE_URL), -o-linear-gradient(top, #6cab26, #6ceb86); /* Opera 11.10+ */ background-image: url(IMAGE_URL), linear-gradient(to bottom, #6cab26, #6ceb86); /* W3C */
原文：http://www.cnblogs.com/jine/p/4033368.html