How Can I Test My Website How Can I Test My Website In ALL Browsers?

How can I test my website in ALL browsers? - how can i test my website

Everything I saw online was in 2004 or earlier. "Nobody came to anything that can allow someone to test your website in different browsers with one form simulator?" My main concern is Internet Explorer and Netscape, and since you can not have multiple versions of IE, it is impossible for me, it test. I wish that all browser software emulated, if possible buy.