DOES THE IPHONE INTERNET WORKS EXACTLY LIKE THE ONE ON THE COMPUTER?

I’m formulation to buy an iPhone. But prior to i do which i need to find out if the iphone can perspective each website only similar to the one on the computer. Does Safari await all websites together with JAVA and peep players. Can i perspective Youtube and pics and alternative videos on the Iphone regulating the interent website? One final thing how prolonged does it take for a page to load?