How to put stubs for old versions of browsers, disabled javascript and cookies?

Question

JavaScript

Good afternoon! :)
Tell me how to put a stub for old versions of browsers, disabled javascript and cookies?

Answer 1

The two easiest ways:
< noscript /> the content of this tag will be displayed if js is disabled
+ add a no-js class to the tag, which is replaced (deleted?) by a different class when the page is loaded during initialization through js. Therefore, through css, display some kind of stub for the case with html.no-js, otherwise hidden.

Answer 2

As browser developers have repeatedly stated, you need to check features. There is document.cookie to check cookie