Mouse over the sketch, then mouse out. The background color should change for each.
Processing.js only
// written by Chris Lonnen // Issue 670 // Mouse over the window. Then move the mouse out. // Does the background change color? void setup() { size(200,200); background(10); } void draw() {} void mouseOut() { background(140,50,80); } void mouseOver() { background(50,80,140); }