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HTML 

              
                <pre><code class= "textoCSS"></code></pre>
<div class = "gradient"></div>


<div class = "leftRight i"></div>
<div class = "topBottom i"></div>
<div class = "circleEllipse i"></div>
!

CSS 

              
                * {
  margin: 0;
  padding: 0;
  background-color: #eee;
  font-size:12px;
}

.gradient {
  width: 300px;
  height: 200px;
  border: 1px solid #d9d9d9;
  margin: 2em auto;
}


.i{width:300px;margin: 1em auto;}
.i *{display:inline-block;}
.i div{width:5.2em; height:1em;}
.i input{margin:0 .5em;}


.textoCSS {
  display: block;
  padding: .2em;
  margin: 0;
  color: #eee;
  background-color: black;
  font-family: courier, monospace;
  line-height:250%;
  white-space:normal;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.textoCSS mark {
  display: inline-block;
  min-width: 6em;
  padding:.5em;
  line-height:70%;
  text-align: center;
  background-color: orange;
  color: black;
  border-radius: .5em;
  border: 3px solid currentColor
}
.textoCSS mark.ce {background-color: yellow;}
!

JS 

              
                // colores para el degradado
var colorInicial = "yellow";
var colorEnElMedio1 = "gold 50%";
var colorEnElMedio2 = "yellow 55%";
var colorFinal = "tomato";
var color_stops = colorInicial+", "+colorEnElMedio1+","+colorEnElMedio2+", "+colorFinal;

// crea una nueva hoja de estilo
var nuevaHojaDeEstilo = document.createElement("style");
document.head.appendChild(nuevaHojaDeEstilo);
var textoCSS = document.querySelector(".textoCSS");//<pre><code>


inputsRy = [];
var radios = [
  {name:"leftRight",value:"left"},
  {name:"leftRight",value:"right"},
  {name:"leftRight",value:"center"},
  {name:"topBottom",value:"top"},
  {name:"topBottom",value:"bottom"},
  {name:"topBottom",value:"center"},
  {name:"circleEllipse",value:"circle"},
  {name:"circleEllipse",value:"ellipse"}
];

for(var i = 0; i < radios.length; i++){
  var ep = document.querySelector("."+radios[i].name);
  var input = new Input();
  input.att.type = "radio";
  input.att.name = radios[i].name;
  input.att.value = radios[i].value;
  if(radios[i].value == "center" || radios[i].value == "ellipse"){input.att.checked = true;}
  input.crear(ep);
  inputsRy.push(input); 
}



function actualizarCSS() {
  var pos = "";// la posición del centro
  var forma ="ellipse";
  for (var i = 0; i < inputsRy.length; i++) {
    if(inputsRy[i].input.checked == true){
      if(inputsRy[i].att.name !="circleEllipse"){
      pos += inputsRy[i].att.value + " ";
      }else{
      forma = inputsRy[i].att.value + " ";
      }
  }
  pos = isBlank(pos) ? "" : pos+" ";
  cadenaCSS(pos, forma);
}
}






actualizarCSS();

var gradient = document.querySelector(".gradient");

function cadenaCSS(pos,forma){
var pos1 = pos.length > 0 ? "at "+ pos+"," : pos+",";
//background: -webkit-radial-gradient(posición, forma tamaño, color-stops);
var CSSstr = ".gradient{background-image: -webkit-radial-gradient("+pos+" "+forma+" farthest-side, "+color_stops+");}\n";  
//background: radial-gradient(tamaño forma at posición, color-stops);
CSSstr += ".gradient{background-image: radial-gradient(farthest-side "+forma+" "+pos1+" "+color_stops+");}\n";
nuevaHojaDeEstilo.textContent = CSSstr;
var cadenaTextoCSS = CSSstr.replace( /\n/ , "<br>");
cadenaTextoCSS = cadenaTextoCSS.replace( /((at )?(top|bottom|left|right|center)\s*(top|bottom|left|right|center)?)/g , "<mark>$1</mark>"); 
cadenaTextoCSS = cadenaTextoCSS.replace( /(circle|ellipse)/g , "<mark class='ce'>$1</mark>"); 
textoCSS.innerHTML = cadenaTextoCSS; 
}


function isBlank(str) {
    return (!str || /^\s*$/.test(str));
}


for (var n = 0; n < inputsRy.length; n++) {
  (function(n) {
inputsRy[n].input.addEventListener("change", function() {

      inputsRy[n].actualizar();
      actualizarCSS();
      //cadenaCSS("top left,");
    }, false)
  }(n));
}
!
999px

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