<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<canvas id = "canvas">
</canvas>
<script>
var canvas = document.getElementById('canvas');
var gl = canvas.getContext('webgl') || canvas.getContext('experimental-webgl');
var extensions = gl.getSupportedExtensions();
for(var e in extensions){
document.write(extensions[e] + ",");
}
</script>
</body>
</html>
こんな感じで，gl.getSupportedExtensions()を呼び出せば，拡張機能の一覧が取得できる．
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