detect_if_browser_focus_or_not_focus.php

Quell Code

 <header>
            <h1>Page Visibility API</h1>
        </header>
        <article>
            <audio id="music">
               <source src="http://www.returngis.net/wp-content/uploads/pics/2012/11/Fringe.wav" />
                <source src="http://www.returngis.net/wp-content/uploads/pics/2012/11/Fringe.mp3" />
                <source src="http://www.returngis.net/wp-content/uploads/pics/2012/11/Breaking_Bad.ogg" />
             </audio>     
            <h2>Log</h2>            
            <ul id="output"></ul>
        </article>