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TallExcitement / FullScreen Mangadex

// ==UserScript==
// @name         FullScreen Mangadex
// @namespace    https://openuserjs.org/users/TallExcitement
// @version      0.1
// @description  FullScreen Mangadex
// @author       TallExcitement
// @copyright    2019, TallExcitement (https://openuserjs.org/users/TallExcitement)
// @license      MIT
// @match        https://mangadex.org/chapter/*/*
// @grant        none
// ==/UserScript==

// ==OpenUserJs==
// @author       TallExcitement
// ==/OpenUserJs==

(function () {
  'use strict';
  const b = document.createElement('button');
  b.textContent = "fs";
  b.addEventListener('click', (e) => {
    if (!document.fullscreenElement) {
      document.documentElement.requestFullscreen();
    }
    else if (document.exitFullscreen) {
      document.exitFullscreen();
    }
  });
  b.style.position = 'absolute';
  b.style.top = 0;
  b.style.left = 0;
  b.style.opacity = 0.3;
  b.style.zIndex = 9000;
  document.body.prepend(b);
})();