使用CSS切角 [英] Cut Corners using CSS

问题描述

我希望剪切div的左上角，就好像您已经折叠了页面的一角。

I'm looking to "cut" the top left corner of a div, like if you had folded the corner of a page down.

我想

推荐答案

如果父元素有纯色背景，你可以使用伪元素创建效果：

If the parent element has a solid color background, you can use pseudo-elements to create the effect:

div {
    height: 300px;
    background: red;
    position: relative;
}

div:before {
    content: '';
    position: absolute;
    top: 0; right: 0;
    border-top: 80px solid white;
    border-left: 80px solid red;
    width: 0;
}

http://jsfiddle.net/2bZAW/

PS a href =http://lea.verou.me/2013/03/border-corner-shape-is-in-danger-and-you-can-help/>即将到来的 border-角形 正是你要找的。太糟糕了，它可能会切断规范，永远不会在任何浏览器的野生：（

P.S. The upcoming border-corner-shape is exactly what you're looking for. Too bad it might get cut out of the spec, and never make it into any browsers in the wild :(

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