搜索框设置背景图 通过设置placeholder属性添加

/#keyword/id名为keyword的input框（搜索框）添加背景图片#keyword::-webkit-input-placeholder { color: transparent; text-indent: -9999px; background: transparent url(../img/google_custom_search_watermark.gif) no-repeat 10% center;}#keyword::-moz-placeholder { /* Firefox 19+ / color: transparent; text-indent: -9999px; background: #fff url(../img/google_custom_search_watermark.gif) no-repeat 10% center;}#keyword:-moz-placeholder { / Firefox 18- / color: transparent; text-indent: -9999px; background: transparent url(../img/google_custom_search_watermark.gif) no-repeat 10% center;}#keyword:-ms-input-placeholder { / IE 10- */ color: transparent; text-indent: -9999px; background: transparent url(../img/google_custom_search_watermark.gif) no-repeat 10% center;}