I have an interactive canvas, where you can click on some buttons. But when I test it on mobile, and try to click on the buttons, it doesnt react immediately. I have to press and wait for the action.

test here: <http://choix.me/labor/canvas/car.html>

here the javascript code for the upBtn:

```
    this.upBtn.addEventListener("mousedown", upClick.bind(this));
    this.upBtn.addEventListener("click", upRelease.bind(this));

    function upClick()
    {
                up = true;
                speed = 10;
                forward = 1;
    }
    function upRelease()
    {
                up = false;
                speed = 10;
                forward = 0;
    }

```