What proof do you have that you're "not supposed to be able to" navigate a website with only your keyboard? What authoritative statement dictates that the web s

What proof do you have that you're "not supposed to be able to" navigate a website with only your keyboard? What authoritative statement dictates that the web should require usage of a mouse? If you take a second to look at that statement, you should be able to see how it is quite ableist (possibly unintentionally).