How to make changeable themes using CSS and JavaScript

Question

I\'m pretty new to CSS and JavaScript and I was wondering if you could make a script that allows you to change what stylesheet the site uses.

Say: you had a green t

Answer 1

You can set an Id to the link tag and switch the css at runtime.

HTML

JS

document.getElementById('buttonID').onclick = function () { 
    document.getElementById('theme_css').href = '../red.css';
};