Replace old Flash Player-based YouTube embeds by their new HTML5 counterparts

Ideal if you don't have Flash Player installed in your device. I know I don't.

K instalaci tototo skriptu si budete muset nainstalovat rozšíření jako Tampermonkey, Greasemonkey nebo Violentmonkey.

You will need to install an extension such as Tampermonkey to install this script.

K instalaci tohoto skriptu si budete muset nainstalovat rozšíření jako Tampermonkey nebo Violentmonkey.

K instalaci tohoto skriptu si budete muset nainstalovat rozšíření jako Tampermonkey nebo Userscripts.

You will need to install an extension such as Tampermonkey to install this script.

K instalaci tohoto skriptu si budete muset nainstalovat manažer uživatelských skriptů.

(Už mám manažer uživatelských skriptů, nechte mě ho nainstalovat!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(Už mám manažer uživatelských stylů, nechte mě ho nainstalovat!)

// ==UserScript==
// @name        Replace old Flash Player-based YouTube embeds by their new HTML5 counterparts
// @description Ideal if you don't have Flash Player installed in your device. I know I don't.
// @namespace   greasyfork.org/users/4813-swyter
// @include     *
// @version     2016.01.03
// @noframes
// @grant       none
// @run-at      document-start
// @icon        https://i.imgur.com/L2y0zMj.png
// ==/UserScript==

/* wait until the page is ready for the code snipped to run */
document.addEventListener('DOMContentLoaded', function()
{
  /* iterate over all the existing SWF Youtube players in the page */
  for (var cur in (vids=document.querySelectorAll('object > embed[src*="youtube"]')))
  {
    console.log(vids[cur], typeof vids[cur]);

    /* create the HTML5 player element */
    iframe = document.createElement('iframe');
    iframe.src = 'https://www.youtube.com/embed/' + vids[cur].src.split('?')[0].split('/')[4];

    /* keep their same size */
    iframe.width = vids[cur].width;
    iframe.height = vids[cur].height;

    /* no borders plz, thanks! */
    iframe.setAttribute("frameborder", 0);

    /* replace the old SWF Flash object with it, voilà */
    vids[cur].parentNode.parentNode.replaceChild(iframe, vids[cur].parentNode);
  }
}, false);