How do I make a CSS triangle with smooth edges?

Question

I have a triangle (JSFiddle) using this CSS:

.triangle {
    width: 0;
    height: 0;
    border-top: 0;
    border-bottom: 30px solid #666699;
    border-le         


        

Answer 1

What really helped me when first stumbling over this was to scale a uniform triangle by a certain amount. Firefox seems to be particularly 'edgy' with scalene triangles. Interesting though, perfect triangles get rendered without jagged edges. If CSS transforms are possible in your project, just try:

.triangle {
  width: 0;
  height: 0;
  border-top: 0;
  border-bottom: 20px solid #666699;
  border-left: 20px solid transparent; 
  border-right: 20px solid transparent;
  -moz-transform: scaleY(1.5); // optional: replace with Sass/SCSS/LESS mixin
  -moz-transform-origin: top; // optional: replace with mixin, too
}

This fixed the aliasing across the edge for me. JSFiddle here (Mozilla only right now). Hope this helps!