Here are some demo files in the WebM Format to test your WebM Player.
If you cannot play these files you may find further information at How to Play WebM Files.
(to save the WebM File to your computer right-click and select “save as…”)
– 
(2 MB, Source Material: bigbuckbunny.org)
(8 MB, Source Material: orange.blender.org)
WebM Videos within the HTML5 <Video> Tag
If you use a modern web browser, you should be able to play WebM Files directly within a webpage, without using additional Player-Software like Adobe Flash.
Just try it below – if you see the video, your browser is capable of playing WebM Videos.
(embedded using the <Video> Tag and the WebM MIME type, see how-to)
You can find some Car related Webm Files at the Auto Tests Website, licensed as Creative Commons.