Hello there. I am embedding a video on my page with this source code: <video> <source src="Example.webm"> <source src="Example.mp4"> <img src="Example.gif"> </video> I added the <img>-Tag because I want the image to show for browsers that don't support HTML5. But my problem is that the GIF is loading everytime, even if the browser supports HTML5. This makes my site slow because I have a lot of videos on it. Is there a way to load the GIF-File only if the browser does NOT support HTML5?