How to get canvas?

Help
#1

I want to set html5 to full screen using this script

 document.getElementById("canvas");
 if (i.requestFullscreen) {
    this.requestFullscreen();
 } else if (i.webkitRequestFullscreen) {
    i.webkitRequestFullscreen();
 } else if (i.mozRequestFullScreen) {
    i.mozRequestFullScreen();
 } else if (i.msRequestFullscreen) {
    i.msRequestFullscreen();
 }

but getElementById always returns null

#2

document.getElementsByTagName('canvas')[0];

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