ultra-retro

konami.js

( () => {
  const expect = [ 38, 38, 40, 40, 37, 39, 37, 39, 66, 65 ];
  const pressed = [];

  document.addEventListener( 'keyup', e => {
    pressed.push( e.keyCode );

    for ( let i = 0; i < pressed.length; ++i ) {
      if ( pressed[ i ] !== expect[ i ] ) {
        pressed.length = 0;
        break;
      }
    }

    if ( pressed.length === expect.length ) {
      const links = document.getElementsByTagName('link');

      [ ...links ].forEach( el => {
        if ( el.rel === 'stylesheet' ) {
          el.parentElement.removeChild( el );
        }
      });
      
      pressed.length = 0;
    }
  });
})();