JS1k: The JavaScript code golfing competition

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/**
 *  @file javascript into shim.html
 *  @version 2019-02-05-10-52-00
 *  @date 2019/02/05
 *  @author Patrice CHASSAING
 *  @copyright Me
 *  @brief JS1k 2019 demo contest : "Draw it back."
*/
//1013bytes
///*
var l=64, A=10, mouse=0, selected_Color='#fff', d=document;
//s=768, //l*12

function g(i) {
	  return d.getElementById(i)
}

function c(t,i){
	var e = g(i);
	if (!e){
		e = d.createElement('div');	
		t.appendChild(e);
		e.id = i;		
		}
	return e;
}

b.innerHTML='<style>div{float:left}.C{width:10px;height:10px;border:solid 1px #000}#S,#v,#background{width:768px}#v,#background{height:768px}#a{border:solid 1px #000;width:64px;height:64px}</style><div id="v"></div><div><canvas id="a"></canvas><br/><input id="I" type="Color"/><input onclick="top.reload()" type="Reset"/><br/><div id="S"></div></div><div id="background"></div>';

var a=g('a'), v=g('v'), S=g('S'), I=g('I');
ctx=a.getContext("2d"), a.width=l, a.height=l;

window.addEventListener('mouseup', function(){mouse=0});
window.addEventListener('dragstart', function(e){mouse=0;e.preventDefault();});

selected_Color='rgb(0,0,0,0)';var e = c(S,selected_Color);e.className='C';e.bgcolor=e.style.backgroundColor=selected_Color;e.addEventListener('click', function(){selected_Color=this.bgcolor});

function background(t){t.bgcolor=t.style.backgroundColor=selected_Color;var e = c(S,selected_Color);e.className='C';e.bgcolor=e.style.backgroundColor=selected_Color;e.addEventListener('click', function(){selected_Color=this.bgcolor});x0=parseInt(t.id.split('_')[1]);y0=parseInt(t.id.split('_')[0]);ctx.fillStyle=selected_Color;ctx.fillRect(x0, y0, 1, 1);g('background').style.background='url('+a.toDataURL()+')'}
	for (var i = 0; i< l; i++) {
		for (var j = 0; j< l; j++) {
			var e=c(v,i+'_'+j);
			e.className='C';
			e.addEventListener('mousedown', function(){mouse=1;background(this)});
			e.addEventListener('mouseover', function(){if (mouse){background(this)}});
		}
	}
	
I.addEventListener('change', function(){selected_Color=this.value});
//*/