HSL to RGB // IE9+ // 174 bytes

long.js

/*
Returns a [R,G,B] array. [R,G,B] are [0,255] numbers. [h,s,l] are [0,1] numbers
*/
function(h, s, l){
  s=l < 0.5 ? l * (1 + s) : l + s - l * s,
  l = 2 * l - s;
  return [h+1/3,h,h-1/3].map(function(t,c){
    return (((c=s-l,t+=t<0?1:t>1?-1:0)<1/6?l+6*c*t:.5>t?s:t<2/3?l+c*(2/3-t)*6:l)*255)+.5|0;
  });
}

short.js

function(b,c,a){c=.5>a?a*(1+c):a+c-a*c;a=2*a-c;return[b+1/3,b,b-1/3].map(function(d,b){return 255*((b=c-a,d+=0>d?1:1<d?-1:0)<1/6?a+6*b*d:.5>d?c:d<2/3?a+b*(2/3-d)*6:a)+.5|0})}