Fix fullscreen orientation on Chrome mobile

fullscreen-landscape.user.js

// ==UserScript==
// @name         Fullscreen Landscape
// @namespace    https://kairusds.js.org/
// @version      0.1
// @description  Fix Chrome mobile fullscreen orientation
// @author       kairusds
// @match        http://*/*
// @match        https://*/*
// @icon         data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==
// @grant        none
// ==/UserScript==

(function() {
	"use strict";
	
	document.addEventListener('fullscreenchange', (event) => {
		if(!document.fullscreenElement){
			screen.orientation.unlock();
		}
		screen.orientation.lock("landscape-primary");
	});
})();