LayoutTests/fast/canvas/webgl/out-of-bounds-simulated-vertexAttrib0-drawArrays.html

<script>

if (window.testRunner)
    window.testRunner.dumpAsText();

function createShader(str, type) {
    var shader = gl.createShader(type);
    gl.shaderSource(shader, str);
    gl.compileShader(shader);
    return shader;
}

function createProgram(vstr, fstr) {
    var program = gl.createProgram();
    var vshader = createShader(vstr, gl.VERTEX_SHADER);
    var fshader = createShader(fstr, gl.FRAGMENT_SHADER);
    gl.attachShader(program, vshader);
    gl.attachShader(program, fshader);
    gl.linkProgram(program);
    return program;
}

var canvas = document.createElement("canvas");
var gl = canvas.getContext("webgl");

var vs = 'attribute vec2 pos; void main() { gl_Position = vec4(pos, 0, 1); }';
var fs = 'precision mediump float; void main() { gl_FragColor = vec4(0,0.8,0,1); }';
var program = createProgram(vs, fs);
gl.useProgram(program);
gl.drawArrays(0, 0, 0x4000000);
</script>