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Because they are operating systems! These operating systems (and others) support web browsers which are applications that run on the operating system.
A website remains the same for all operating systems. All that matters is the web browsers that handles it.
some are not
Yes, except for a Internet Explorer which only works on Windows PCs. Most all other major browsers have a Mac and Windows version.
HTML is important to web browsers as it forms the web pages. The web pages are the ones which run on the browsers.
Are not all browsers full screen if you want them to be?
Web browsers use the Flash Player to play content such as games and animations that have been created with Flash and embedded in a web page.
"Yes, some browsers can store account login information. In a system called caching, some browsers will store previously viewed websites for faster loading at a later visit. Some web browsers even allow users the option of storing this information for ease of use."
Firefox Konqueror Internet Explorer (historic) Safari (only on Mac OS X) Opera Lynx
Web Browsers are softwares used for viewing web pages. They can also be used for developing and testing web pages.
You can do that with most web browsers, such as Firefox.
Some common web browsers are Firefox, Chrome, Safari, and Internet Explorer.