I believe it’s good UX to allow the user to preview their media files before uploading them to a server. This is for both audio and video files. Coming from the last tutorial where we previewed an MP3 file, you will notice a lot of the code here is very similar. Previewing a selected video file in an HTML5 video element is VERY similar to previewing a selected audio file in an HTML5 audio element. Both make use of the modern elements.