背景线性渐变在 Safari 中不起作用

我正在尝试在图像上设置线性渐变背景，我的代码可以在 Chrome 中运行，但不能在 Safari 中运行。这是我的代码的完整示例：

HTML:

<div>
  <img src="./assets/51a-front-img.png" draggable="false"/>
</div>

CSS:

div:after{
  content: '\A';
  position: absolute;
  width: 100%;
  height: 100%;
  top:0;
  background: rgba(0,0,0,0.5);
  background: -moz-linear-gradient(top,  rgba(0,0,0,0.5) 0%,rgba(0,0,0,0.7) 100%); /* FF3.6+ */
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(0,0,0,0.5)), color-stop(100%,rgba(0,0,0,0.7))); /* Chrome,Safari4+ */
  background: -webkit-linear-gradient(top,  rgba(0,0,0,0.5) 0%,rgba(0,0,0,0.7) 100%); /* Chrome10+,Safari5.1+ */
  background: -o-linear-gradient(top,  rgba(0,0,0,0.5) 0%,rgba(0,0,0,0.7) 100%); /* Opera 11.10+ */
  background: -ms-linear-gradient(top,  rgba(0,0,0,0.5) 0%,rgba(0,0,0,0.7) 100%); /* IE10+ */
  background: linear-gradient(to bottom, rgba(0,0,0,0.5) 0%,rgba(0,0,0,0.7) 100%); /* W3C */
}

img {
  position: relative;
  width: 100%;
}

div:after 需要定位在左边缘（chrome 默认情况下）。将你的CSS更改为：

div:after{
  content: '\A';
  position: absolute;
  width: 100%;
  height: 100%;
  top:0;
  left:0;
  background: rgba(0,0,0,0.5);
  background: -moz-linear-gradient(top,  rgba(0,0,0,0.5) 0%,rgba(0,0,0,0.7) 100%); /* FF3.6+ */
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(0,0,0,0.5)), color-stop(100%,rgba(0,0,0,0.7))); /* Chrome,Safari4+ */
  background: -webkit-linear-gradient(top,  rgba(0,0,0,0.5) 0%,rgba(0,0,0,0.7) 100%); /* Chrome10+,Safari5.1+ */
  background: -o-linear-gradient(top,  rgba(0,0,0,0.5) 0%,rgba(0,0,0,0.7) 100%); /* Opera 11.10+ */
  background: -ms-linear-gradient(top,  rgba(0,0,0,0.5) 0%,rgba(0,0,0,0.7) 100%); /* IE10+ */
  background: linear-gradient(to bottom, rgba(0,0,0,0.5) 0%,rgba(0,0,0,0.7) 100%); /* W3C */
}

img {
  position: relative;
  width: 100%;
}