script to execute on "chrome dev tools - console tab" to easily dark mode any page

script.js

(function() {
  var css = `
    body {
      background: white;
    }
    html {
      filter: invert(100%) hue-rotate(180deg);
    }
    img {
      filter: invert(100%) hue-rotate(180deg);
    }
    video {
      filter: invert(100%) hue-rotate(180deg);
    }
  `;
  var style = document.createElement('style');
  style.appendChild(document.createTextNode(css));
  document.head.appendChild(style);
})();

invoked as IIFE - Immediately Invoked Function Expression, more info here