youtube iframe injector

ybif.js

// ==UserScript==
// @name         youtube frame
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        https://www.youtube.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=youtube.com
// @grant        none
// ==/UserScript==


(function() {
    'use strict';
        if (window.top !== window.self){
        console.log("wtf")
        return
    }
       let called = false
       const replace = () => {
 const element = document.getElementById("full-bleed-container");
        let params = new URL(document.location).searchParams;
        let vid = params.get('v')
        var parser = new DOMParser();
        var newNode = parser.parseFromString(`<iframe width="100%" height="100%" src="https://www.youtube.com/embed/${vid}?&autoplay=1" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>`, "text/html");
        element.textContent=''
        element.appendChild(newNode.documentElement);

           element.children[0].style.height = '100%'
           element.children[0].style.width = '100%'
 element.children[0].children[1].style.height = '100%'
           element.children[0].children[1].style.width = '100%'
       }
       function checkForElement() {
            const element = document.getElementById("full-bleed-container");
            if (element) {
              if(called)return
              replace(element)
              called = true
              observer.disconnect()
            }
        }
        const config = { childList: true, subtree: true };
        const observer = new MutationObserver(function(mutations) {
            mutations.forEach(function(mutation) {
                if (mutation.type === "childList") {
                    checkForElement();
                }
            });
        });
        observer.observe(document.body, config);


    // Your code here...
})();