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Redirects any opened YT video to the YT embedded video to make the video take the whole screen.
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// ==UserScript==
// @name Redirect YT video to embedded video
// @namespace YTRedir
// @version 0.8
// @description Redirects any opened YT video to the YT embedded video to make the video take the whole screen.
// @author hacker09
// @include https://m.youtube.com/*
// @include https://www.youtube.com/*
// @icon https://www.youtube.com/s/desktop/03f86491/img/favicon.ico
// @run-at document-start
// @grant none
// ==/UserScript==
(function() {
'use strict';
function Run() { //Creates a new function
if ((location.pathname !== '/') && (location.href.match('/watch') !== null) && (location.href.match(/&list=|&t=1s|embed/) === null)) //As long as it's not the YT index page, the URL is a video, it's not a playlist/embedded video, and doesn't have '&t=1s' in the end of the URL
{ //Starts the if condition
const NoFeatureTitle = location.href.replace('&feature=emb_title', ''); //Remove the feature title URL parameters
const NoFeatureLogo = NoFeatureTitle.replace('&feature=emb_logo', ''); //Remove the feature logo URL parameters
const YTID = 'https://www.youtube.com/embed/' + location.search.replace('?v=', '') + '?autoplay=1'; //Store embedded URL
location = NoFeatureLogo.replace(location.href, YTID); //Redirect the YT Link
} //Finishes the if condition
} //Finishes the Run function
if ((location.pathname !== '/') && (location.href.match('/watch') !== null) && (location.href.match(/&list=|&t=1s|embed/) === null)) //As long as it's not the YT index page, the URL is a video, it's not a playlist/embedded video, and doesn't have '&t=1s' in the end of the URL
{ //Starts the if condition
Run(); //Calls the Run function
} //Finishes the if condition
window.ontransitionrun = function() { //When the video is changed
Run(); //Calls the Run function
}; //Finishes the transitionend event listener
window.onload = function() { //When the page loads
if (location.href.match('embed') !== null) //As long as the URL is an embedded video
{ //Starts the if condition
document.querySelector("a.ytp-title-link").outerHTML = document.querySelector("a.ytp-title-link").outerHTML; //Remove the event listeners of the element
document.querySelector("a.ytp-title-link").href += '&t=1s'; //Add url parameter to start video on the first second of the video, so that the script won't redirect the URL
document.querySelector("a.ytp-title-link").target = '_self'; //Open the video in the same tab
document.querySelector(".ytp-button.yt-uix-sessionlink").outerHTML = document.querySelector(".ytp-button.yt-uix-sessionlink").outerHTML; //Remove the event listeners of the element
document.querySelector(".ytp-button.yt-uix-sessionlink").href += '&t=1s'; //Add url parameter to start video on the first second of the video, so that the script won't redirect the URL
document.querySelector(".ytp-button.yt-uix-sessionlink").target = '_self'; //Open the video in the same tab
} //Finishes the if condition
}; //Finishes the onload event listener
})();