When calling LoadAsset on an AssetBundle, null is returned on WebGL. There is no exception, just a return value of null.
It works in the Editor on Windows. I am able to load other asset types such as Sprite from the bundle on WebGL. I can see the video file listed when I call AllAssetNames() on the asset bundle. I have tried the VP8 codec as well as auto. The AssetBundle is loaded using WWW.LoadFromCacheOrDownload.
I am using 2019.3.0b1.