Video and audio controls does not work in html
<p>If i use autoplay, the audio plays but then it does not stop on clicking the pause-play button. Similarly, i cant change the volume or mute the audio. My video doesnot play at all. Only the control bar is shown, nothing else happens. I use Chrome browser, just in case it has to do anything with that. I dont know whats wrong. Also is there any difference in HTML and HTML5 that may have something to do with the video tag?</p>

<pre><code>&lt;audio src="ACDC%20-%20Back%20In%20Black.mp3" controls autoplay&gt;&lt;/audio&gt;

&lt;video height="300px" width="300px" autoplay controls&gt;
    &lt;source="https://www.youtube.com/watch?v=KnZtdrcA4f8"&gt;
&lt;/video&gt;
</code></pre>