如何在iOS Safari上设置渐变背景透明度？

Question

以下CSS在Safari上不起作用（已在iPad iOS上测试）：

.map-left-navi {
    background: #ffffff;
    background: -moz-linear-gradient(left, #ffffff 35%, transparent 100%);
    background: -webkit-linear-gradient(left, #ffffff 35%,transparent 100%);
    background: linear-gradient(to right, #ffffff 35%,transparent 100%);
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ffffff', endColorstr='transparent',GradientType=1 );
}

有什么解决办法可以保持透明度吗？

编辑- 解决方案：

使用rgba CSS颜色值：

.map-left-navi {
    background: #ffffff;
    background: -moz-linear-gradient(left, rgba(255,255,255, 0.35), rgba(255,255,255, 0));
    background: -webkit-linear-gradient(left, rgba(255,255,255, 0.35), rgba(255,255,255, 0));
    background: linear-gradient(to right, rgba(255,255,255, 0.35), rgba(255,255,255, 0));
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ffffff', endColorstr='transparent',GradientType=1 );
}

Answer 1

使用rgba而不是透明的。

.map-left-navi {
    background: #ffffff;
    background: -moz-linear-gradient(left, rgba(255,255,255, 0.35), rgba(255,255,255, 0));
    background: -webkit-linear-gradient(left, rgba(255,255,255, 0.35), rgba(255,255,255, 0));
    background: linear-gradient(to right, rgba(255,255,255, 0.35), rgba(255,255,255, 0));
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ffffff', endColorstr='transparent',GradientType=1 );
}