Cut Corners using CSS

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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;
}
<div></div>

http://jsfiddle.net/2bZAW/

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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