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<canvas width='800' height='600'></canvas>
<script>
var tela = document.querySelector('canvas');
var pincel = tela.getContext('2d');
 
function desenhaQuadrado (x, y, cor){
pincel.fillStyle = cor;
pincel.fillRect(x, y, 50, 50);
pincel.fillStroke = 'black';
pincel.strokeRect(x, y, 50, 50)
 
};
 
// Cria MALHA
for (x = 0 ; x <= 800; x = x + 50){
	for (y = 0; y <= 600; y = y + 50){
desenhaQuadrado(x, y, 'white')
	};
};
//
 
function pintaQuadrado(evento){
var x = evento.pageX - tela.offsetLeft;
var y = evento.pageY - tela.offsetTop;
desenhaQuadrado(x - 25, y - 25, 'black');
console.log(x + " , " + y);
console.log(evento);
}
 
tela.onclick = pintaQuadrado;
</script>
 

Main.java:1: error: class, interface, or enum expected
<canvas width='800' height='600'></canvas>
^
Main.java:1: error: class, interface, or enum expected
<canvas width='800' height='600'></canvas>
 ^
Main.java:1: error: unclosed character literal
<canvas width='800' height='600'></canvas>
              ^
Main.java:1: error: unclosed character literal
<canvas width='800' height='600'></canvas>
                  ^
Main.java:1: error: unclosed character literal
<canvas width='800' height='600'></canvas>
                           ^
Main.java:1: error: unclosed character literal
<canvas width='800' height='600'></canvas>
                               ^
Main.java:3: error: unclosed character literal
var tela = document.querySelector('canvas');
                                  ^
Main.java:3: error: unclosed character literal
var tela = document.querySelector('canvas');
                                         ^
Main.java:4: error: class, interface, or enum expected
var pincel = tela.getContext('2d');
^
Main.java:4: error: unclosed character literal
var pincel = tela.getContext('2d');
                             ^
Main.java:4: error: unclosed character literal
var pincel = tela.getContext('2d');
                                ^
Main.java:6: error: class, interface, or enum expected
function desenhaQuadrado (x, y, cor){
^
Main.java:8: error: class, interface, or enum expected
pincel.fillRect(x, y, 50, 50);
^
Main.java:9: error: class, interface, or enum expected
pincel.fillStroke = 'black';
^
Main.java:9: error: unclosed character literal
pincel.fillStroke = 'black';
                    ^
Main.java:9: error: unclosed character literal
pincel.fillStroke = 'black';
                          ^
Main.java:15: error: class, interface, or enum expected
for (x = 0 ; x <= 800; x = x + 50){
^
Main.java:15: error: class, interface, or enum expected
for (x = 0 ; x <= 800; x = x + 50){
             ^
Main.java:15: error: class, interface, or enum expected
for (x = 0 ; x <= 800; x = x + 50){
                       ^
Main.java:16: error: class, interface, or enum expected
	for (y = 0; y <= 600; y = y + 50){
	            ^
Main.java:16: error: class, interface, or enum expected
	for (y = 0; y <= 600; y = y + 50){
	                      ^
Main.java:17: error: unclosed character literal
desenhaQuadrado(x, y, 'white')
                      ^
Main.java:17: error: unclosed character literal
desenhaQuadrado(x, y, 'white')
                            ^
Main.java:19: error: class, interface, or enum expected
};
^
Main.java:22: error: class, interface, or enum expected
function pintaQuadrado(evento){
^
Main.java:24: error: class, interface, or enum expected
var y = evento.pageY - tela.offsetTop;
^
Main.java:25: error: class, interface, or enum expected
desenhaQuadrado(x - 25, y - 25, 'black');
^
Main.java:25: error: unclosed character literal
desenhaQuadrado(x - 25, y - 25, 'black');
                                ^
Main.java:25: error: unclosed character literal
desenhaQuadrado(x - 25, y - 25, 'black');
                                      ^
Main.java:26: error: class, interface, or enum expected
console.log(x + " , " + y);
^
Main.java:27: error: class, interface, or enum expected
console.log(evento);
^
Main.java:28: error: class, interface, or enum expected
}
^
Main.java:31: error: class, interface, or enum expected
</script>
^
33 errors

Standard output is empty