The first commented line is your dabblet’s title

dabblet.css

/**
 * The first commented line is your dabblet’s title
 */

background: #f06;
background: linear-gradient(41deg, #f06, blue);
min-height: 100%;

dabblet.html

<canvas id="can" width="200" height="200"></canvas>

dabblet.js

function test() {
    var can = document.getElementById("can");
    var context = can.getContext("2d");
    context.beginPath();
    context.moveTo(70,140);
    context.lineTo(140,70);
    
    context.stroke();

}
window.addEventListener("load", test, true);

settings.json

{"view":"split","fontsize":"100","seethrough":"","prefixfree":"1","page":"html"}