Have you been asked to provide a particular document not only in PDF format, but specifically in PDF/A? You are in luck as you can easily create PDF/A with LibreOffice.
As you probably know, PDF is a standard for encoding documents that is portable between systems. Then, if you are wondering how PDF/A differs from “conventional” PDF, according to Wikipedia:
Adobe
Enable HTML5 YouTube playback on Firefox
Today we will learn how to enable HTML5 YouTube playback on Firefox, since it is supported by version 36 of the popular Mozilla browser.
HTML5 is a markup language used for structuring and presenting content for the Internet introduced by World Wide Web Consortium (W3C). The HTML5 specification introduced the video element for the purpose of playing videos, partially replacing the object element and without the support of plugins, like the proprietary Adobe Flash plugin.