Xcloud on browser - Set game video to fill browser area.

xcloud_custom.user.js

// ==UserScript==
// @name         Fill Xcloud Video Screen
// @author       FRNathan13
// @match        https://www.xbox.com/pt-BR/play/launch/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=xbox.com
// @grant        none
// @version      1.0
// ==/UserScript==

(function() {
    'use strict';

    var timer = -1;

    timer = setInterval(() => {
        try {
            var arr = [...document.querySelectorAll('video')];

            for(let el of arr) {
                if(el.style && el.style.objectFit) {
                    if(el.style.objectFit != 'fill'){
                        el.style.objectFit = 'fill';
                        console.info('[Fill Xcloud Video Screen] Element style set to fill content.');
                    }
                }
            }
        }
        catch(e) {
            // ignore
        }
    }, 1000);
})();