[Javascript] Gradient Fills on the HTML5 Canvas

window.onload = function() {

    var canvas = document.getElementById("canvas"),
        context = canvas.getContext("2d");

    var gradient =context.createLinearGradient(100,100,100,200);
    gradient.addColorStop(1,"blue");   // show blue at the bottom
    gradient.addColorStop(0,"yellow"); // show yellow on the top

    context.fillStyle=gradient;
    context.fillRect(100,100,100,100);
};

window.onload = function() {

    var canvas = document.getElementById("canvas"),
        context = canvas.getContext("2d");

    var gradient =context.createLinearGradient(100,100,100,200);
    gradient.addColorStop(1,"blue");   // show blue at the bottom
    gradient.addColorStop(0.75, "pink"); //close to the bottom
    gradient.addColorStop(0,"yellow"); // show yellow on the top

    context.fillStyle=gradient;
    context.fillRect(100,100,100,100);
};

window.onload = function() {

    var canvas = document.getElementById("canvas"),
        context = canvas.getContext("2d");

    var gradient =context.createLinearGradient(100,100,200,100);
    gradient.addColorStop(1,"blue");   // show blue at the bottom
    gradient.addColorStop(0.75, "pink"); //close to the bottom
    gradient.addColorStop(0,"yellow"); // show yellow on the top

    context.fillStyle=gradient;
    context.fillRect(100,100,100,100);
};

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window.onload = function() {

    var canvas = document.getElementById("canvas"),
        context = canvas.getContext("2d");

    var gradient = context.createRadialGradient(100,100,0,100,100,50);
    gradient.addColorStop(0, "white");
    gradient.addColorStop(1, "black");

    context.fillStyle = gradient;
    context.beginPath();
    context.arc(100,100,50,0,Math.PI * 2);
    context.closePath();
    context.fill();

};

var gradient = context.createRadialGradient(100,100,20,100,100,50);

var gradient = context.createRadialGradient(100,100,20,100,100,80);

var gradient = context.createRadialGradient(100,100,20,100,100,30);

var gradient = context.createRadialGradient(120,80,0,110,90,60);