html play video on hover

1In HTML Document:
2<video width='500' height='150'
3       onmouseenter='VideoController(true, this)'
4       onmouseleave='VideoController(false, this)'
5       src="Videos/test.webm" loop>
6  Your browser does not support the video tag.
7</video>
8
9In CSS:
10const VideoController = function(isHovering, videoElement)
11{
12	if (isHovering == true)
13    {
14        videoElement.play();
15    }
16    else if (isHovering == false)
17    {
18        videoElement.pause();
19    }
20}

1this isnt working via css. is thsi js?
2