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jerrywhatsoeveryahoo.com / FloatingButton4IFrames

// ==UserScript==
// @name FloatingButton4IFrames
// @description Floating button for IFrames
// @version 3.18
// @author 2020 Jerry modified from, 2018+ Volkan K., 2014-2016 Max Max
// @license GPL-3.0-or-later; http://www.gnu.org/licenses/gpl-3.0.txt
// @include *
// @run-at document-end
// @grant unsafeWindow
// @require https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js
// @require https://cdnjs.cloudflare.com/ajax/libs/jquery-scrollTo/2.1.2/jquery.scrollTo.min.js
// ==/UserScript==

var RANDOM=Math.floor(Math.random()*1234567890);

frames = document.getElementsByTagName( 'iframe' )
// only work when pages has iframe
if (frames.length < 1) {
    return
}

// [1] skip all iframe
if (window.self != window.top) {
    return
}

// create element
function ce(n) {
    return $('<' + n + '>')[0];
} // end of function

// add style
function addStyle(css) {
    var head = $('head')[0];
    if (head) {
        var style = ce("style");
        style.type = "text/css";
        style.appendChild(document.createTextNode(css));
        head.appendChild(style);
    } // end if
} // end of function

// global variables
var position,
    // figure out if this is moz || IE because they use documentElement
    el = document.documentElement || document.body,
    // timer
    t1, t2,
    // speed by
    speed_by_click = 0, // edit this value
    speed_by_over = 0, // edit this value
    // z-index
    zIindex = 1001; // edit this value

// move up
function move_up() {
    position = document.documentElement.scrollTop || document.body.scrollTop;
    // window.scrollTo(0, position - 1);
    t1 = setTimeout(move_up, speed_by_over);
} // end of function

// move downn
function move_dn() {
    position = document.documentElement.scrollTop || document.body.scrollTop;
    // window.scrollTo(0, position + 1);
    t2 = setTimeout(move_dn, speed_by_over);
} // end of function

function goto_up () {
    // scrollTo(el, 0, speed_by_click);
}

function goto_dn () {
    // scrollTo(el, getDocumentHeight(), speed_by_click);
}

// document height
function getDocumentHeight() {
    var body = $('body')[0];
    return (body.scrollHeight > body.offsetHeight) ? body.scrollHeight : body.offsetHeight;
} // end of function

// document scroll
function get_scroll(a) {
    var d = document,
        b = d.body,
        e = d.documentElement,
        c = "client" + a,
        a = "scroll" + a;
    return /CSS/.test(d.compatMode) ? (e[c] < e[a]) : (b[c] < b[a])
} // end of function

function scrollTo(element, to, duration) {
    return $(element).scrollTo(to,duration);
}

// add css
function shareCSS() {
    // variables
    var s = '',
        img_up, img_dn;

    // img vs button
    img_up = 'data:img/png;base64,iVBORw0KGgoAAAANSUhEUgAAABIAAAAUCAYAAACAl21KAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAB+SURBVDhPY1i1atV/amAGahgCMoNhaIGlS5cKAp19BoRBbLJcj2QILDJINwzoAmMgfoclIkBixkS5DI8hMJcRNgxoSBoOl6CnNZBhaVhdBjWE1MSJahjQkA4KEmYH2GUrV66cSYEhYB+AzKBtFiHkQqKiH6Ro1CDCQTWgYQQAs81DU0G/83sAAAAASUVORK5CYII=';
    img_dn = 'data:img/png;base64,iVBORw0KGgoAAAANSUhEUgAAABIAAAAUCAYAAACAl21KAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAACPSURBVDhPY2DAAlatWvUfH8amB6vYqEGEg2pgw4iQ7cTKM6xcuXImsYpxqQOZAQ4woIIOCgzrQAl1oEFpZBiWhitFgwx7R4SBIDXYDYGZDFRgTMAwkCHGhBMRJMxwGUa8ITCbli5dKgg08AySN8+AxIhyCboiJMPIN4Qsm6miiYioxltawvSDYogohYTUAQC80UNTOht/YwAAAABJRU5ErkJggg==';
    // button id
    s += '#play_btn_up'+RANDOM+' { position:fixed; right:40%; bottom:10%;z-index:' + zIindex + '; height:300px; width:20%; cursor:pointer; background:url() no-repeat scroll 50% 50% rgba(0, 0, 0, 0.7); border-radius:5px 5px 5px 5px; margin-top:-24px; }';
    s += '#play_btn_dn'+RANDOM+' { position:fixed; right:40%; bottom:10%;   z-index:' + zIindex + '; height:300px; width:20%; cursor:pointer; background:url() no-repeat scroll 50% 50% rgba(0, 0, 0, 0.7); border-radius:5px 5px 5px 5px; margin-top:-24px; }';
    // button class
    s += '.play_btn'+RANDOM+' { -webkit-transition-duration:0.5s linear; -o-transition-duration:0.5s linear; -moz-transition-duration:0.5s linear; transition-duration:0.5s linear; opacity:0.01; }';
    s += '.play_btn'+RANDOM+':hover { opacity:1; }';
    // append
    addStyle('' + s);
} // end of function

// main
function create_btn_element() {
    // get scroll
    var up, dn,
        scrolled,
        h = get_scroll('Height');
    // exit
    if (!h) {
        return;
    } // end if

    // add css
    shareCSS();

    // if
    if (el) {
        // create DOM element
        up = ce('span');
        dn = ce('span');
        // set attribute
        up.setAttribute('id', 'play_btn_up'+RANDOM);
        dn.setAttribute('id', 'play_btn_dn'+RANDOM);
        // set class
        up.className = "play_btn"+RANDOM;
        dn.className = "play_btn"+RANDOM;
        // append element
        document.body.appendChild(up);
        document.body.appendChild(dn);

        // scroll
        scrolled = window.pageYOffset || document.documentElement.scrollTop;
        // if scroll
        up.style.display = (scrolled > 0) ? "" : "none";

        // add event over
        up.addEventListener('mouseover', move_up, false);
        dn.addEventListener('mouseover', move_dn, false);
        // add event out
        up.addEventListener('mouseout', function() {
            clearTimeout(t1);
        }, false);
        dn.addEventListener('mouseout', function() {
            clearTimeout(t2);
        }, false);
        // add event click
        up.addEventListener('click', goto_up, false);
        dn.addEventListener('click', goto_dn, false);

        // add event scroll
        window.onscroll = function() {
            var scrolled = window.pageYOffset || document.documentElement.scrollTop,
                diffHeight = document.body.scrollHeight - window.innerHeight;
            // if scroll up
            up.style.display = (scrolled > 0) ? "" : "none";
            // if scroll dn
            dn.style.display = (diffHeight > scrolled) ? "" : "none";
        }; // end of function
    } // end if
} // end of function

// run it
create_btn_element();