Simple script only works in Safari

programming web dev
1

This script only seems to be working in Safari, but I would like it to run in safari and firefox. Any clue why it doesn’t work in firefox?

Thank you for your time.

function init()
{
    var myCanvas = window; //Using "window" for testing
    myCanvas.addEventListener("mousedown", traceEventType);

}

window.onload = init;

function traceEventType(e)
{
    alert(e.type);
}