Feat: add support for React-Router with `<Link />

[andycall]

Add the following essential missing DOM features to make WebF work with React Router's element:

Added DOM Features:

1. Event.preventDefault() for the element.
2. Event.button property.

Demo React.js code:

import './App.css';
import React from 'react';

import { Link } from "react-router-dom";

export default function App() {
    return (
        <div>
            <h1>Bookkeeper</h1>
            <nav
                style={{
                    borderBottom: "solid 1px",
                    paddingBottom: "1rem",
                }}
            >
                <Link to="/about">About</Link> |{" "}
                <Link to="/detail">Detail</Link>
            </nav>
        </div>
    );
}