Used to compare time it takes execute two different javascript lines.

time-complexity.js

function test(option){
	var start = Date.now();
	var result;
	if(option){
		result = $('body').find('p + p + p').parent();
	}else{
		result = $('body').find(':has(> p + p + p)');
	}
	var end = Date.now();
	return (end - start);
}