Hi,
It basically boils down to what browser your participant is using. You can get a list of video format support here: https://www.w3schools.com/html/html5_video.asp
Audio: https://www.w3schools.com/html/html5_audio.asp
Most image formats are supported, including the common formats: PNG, JPG, GIF, BMP. I don’t think you can straightforwardly use a vector image with the Image element though.
Jeremy