 2, 1);
        gl.viewport(canvas.width / 2, 0, canvas.width / 2, canvas.height);
        gl.drawArraysInstanced(gl.TRIANGLES, 6, vertexCount / 2, 1);

        // -- Delete WebGL resources
        gl.deleteBuffer(vertexPosBuffer);
        gl.deleteProgram(program);
        gl.deleteVertexArray(vertexArray);
    })();
    </script>
    <div id="highlightedLines"  style="display: none">#L101</div>
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</html>
