diff --git a/handlers/html.go b/handlers/html.go
index e6c6ef1..6b1554f 100644
--- a/handlers/html.go
+++ b/handlers/html.go
@@ -82,7 +82,7 @@ var htmlWebGL = `
var image = new Image();
ws.onopen = function() {
- var gl = document.getElementById('canvas').getContext('webgl');
+ var gl = canvas.getContext("webgl",{antialias:false}) || canvas.getContext("experimental-webgl");
var vertexShaderSrc =
"attribute vec2 aVertex;" +