Shows the duration of YouTube videos on mobile browsers.
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// ==UserScript==
// @name YouTube Video Duration Checker
// @namespace https://greasyfork.org/en/users/670188-hacker09?sort=daily_installs
// @version 1
// @description Shows the duration of YouTube videos on mobile browsers.
// @author hacker09
// @match https://*.youtube.com/embed/*
// @icon https://www.youtube.com/s/desktop/03f86491/img/favicon.ico
// @run-at document-end
// @grant none
// ==/UserScript==
(function() {
'use strict';
if (document.querySelector(".ytp-time-current") !== '0:00') //If the timer does not exist
{ //Starts the if condition
var timeDisplay = document.createElement('div'); //Create a new div element
timeDisplay.className = 'ytp-time-display notranslate'; //Add a class to the div element
document.querySelector(".ytp-volume-area").appendChild(timeDisplay); //Append the div element
document.querySelector('.video-stream').addEventListener('timeupdate', function() { //When the YT video is playing
var currentMins = Math.floor(document.querySelector('.video-stream').currentTime / 60); //Create a variable to hold the current mins
var currentSecs = Math.floor(document.querySelector('.video-stream').currentTime % 60); //Create a variable to hold the current secs
var totalMins = Math.floor(document.querySelector('.video-stream').duration / 60); //Create a variable to hold the total mins
var totalSecs = Math.floor(document.querySelector('.video-stream').duration % 60); //Create a variable to hold the total mins
currentSecs = currentSecs < 10 ? '0' + currentSecs : currentSecs; //Add leading zero if seconds are less than 10
totalSecs = (/^\d$/.test(totalSecs)) ? totalSecs + '0' : totalSecs; //Add leading zero if minutes is a single digit
timeDisplay.innerHTML = `<span>${currentMins}:${currentSecs} / ${totalMins}:${totalSecs}</span>`; //Show and update the timer
}); //Update the content of the time display element
} //Finishes the if condition
})();