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function getGl() {
var c = document.createElement("canvas");
var gl = c.getContext("experimental-webgl");
assert_true(!!gl, "Should be able to get a context.");
return gl;
}
function shouldGenerateGLError(cx, glError, fn) {
test(function() {
fn();
assert_equals(cx.getError(), glError);
}, "Calling " + fn + " should generate a " + glError + " error.");
}