I'm developing a site that uses JavaScript, HTML5 and CSS3 heavily. I have no desire to support last generations browsers (IE8 and under for example.) What is the most acceptable way to let the visitor know they are on an old browser?
Redirect to a place letting them know? Should I let them in anyway after I let them know even though a large portion of the site wont work? Should I recommend a browser to use, or list all functional browsers?
Its not suggested to allow users to use your page if you are confident that the experience will be a disaster. If you know that 80% of the page won't work, you should advice your users to change the browser or don't use the page at all. If you don't do it, your credibility could be affected...a user could think the page is broken, or not professional.
The best way is to redirect to a page explaining the problem and suggesting A LIST of possible browsers, never a single one. If you suggest a single one, you could be seen as propaganda of this browser.
Good luck!