How to make 3-corner-rounded triangle in CSS

css, css-shapes

Solution

My best attempt: http://dabblet.com/gist/4592062

Pixel perfection at any size, uses simpler math than Ana's original solution, and is more intuitive in my opinion :)

.triangle {
 position: relative;
 background-color: orange;
 text-align: left;
}
.triangle:before,
.triangle:after {
 content: '';
 position: absolute;
 background-color: inherit;
}
.triangle,
.triangle:before,
.triangle:after {
 width:  10em;
 height: 10em;
 border-top-right-radius: 30%;
}

.triangle {
 transform: rotate(-60deg) skewX(-30deg) scale(1,.866);
}
.triangle:before {
 transform: rotate(-135deg) skewX(-45deg) scale(1.414,.707) translate(0,-50%);
}
.triangle:after {
 transform: rotate(135deg) skewY(-45deg) scale(.707,1.414) translate(50%);
}

<div class="triangle"></div>

Problem

I'd like to achieve a custom-colored shape like this using no Javascript: Currently I'm overlaying an image of the 'frame' over an orange rectangular div, but this is pretty hacky. I suppose I could use a dynamically generated canvas element, but that not only requires JS, but HTML5 canvas support. Any ideas?

Original source