it's really annoying when on my web build, the page scrolls with arrow keys. even though it's supposed to focus on the game, it doesn't and the controls make the page scroll.. can this feature get removed please??

In my own web engine, the key to fixing this was adding "preventDefault()" to my key event handling method. FWIW, this is my method:

HandleKeyDown: function (e) {

                var keyCode = e.keyCode;

                [....some code to store / handle key input here...]

                    e.preventDefault();

                }

            }

But more importantly, if you know what term to google for, you can find the solution. :-) 

This seems helpful in your case:

https://www.construct.net/en/forum/construct-3/how-do-i-8/keep-arrow-keys-scroll...