<!DOCTYPE html>
<frameset rows="200px,*">
<frame src='data:text/html,
<!DOCTYPE html>
<style>
img {
    height: 5vh;
}
</style>
<div id="container">
    <!-- 100x50 green square -->
    <img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGQAAAAyCAYAAACqNX6+AAAABmJLR0QA/wD/AP+gvaeTAAAAj0lEQVR4nO3RQQ0AIBDAsAP/nuGNAvZoFSzZmjNnyNi/A3gZEmNIjCExhsQYEmNIjCExhsQYEmNIjCExhsQYEmNIjCExhsQYEmNIjCExhsQYEmNIjCExhsQYEmNIjCExhsQYEmNIjCExhsQYEmNIjCExhsQYEmNIjCExhsQYEmNIjCExhsQYEmNIjCExhsRcpb0CYiXEAt8AAAAASUVORK5CYII=">
</div>
'></frame>
<frame src=""></frame>
</frameset>
</html>