="javascript:_start_xr()">Start XR</a>-->
	</div>
	
	<!-- Create the canvas that the C++ code will draw into -->
	<div style="grid-area: content;">
	<canvas id="canvas" oncontextmenu="event.preventDefault()" width=800 height=480></canvas>
	</div>
	
	<!-- Allow the C++ to access the canvas element --> 
	<script type='text/javascript'>
		var resize_time;
		function canvas_resize(){
			clearTimeout(resize_time);
			resize_time = setTimeout(function() {
				var canv = document.getElementById('canvas');
				canv