Firefox - html5 video - video is not displayed by default

Question

I use the latest Firefox browser and I want to show the default fallback message when the video format is not supported by firefox (as described in the html5 documentation), but firefox only shows the poster image and text on it "No video with format and MIME type support"

Any ideas how to show This is FALLBACK MESSAGE content (as it should have) instead of a firefox error message ? thanks

 <video poster="movie.jpg" controls> <source src="movie.mp4" type='video/mp4; codecs="avc1.4D401E, mp4a.40.2"'/> <p>This is FALLBACK MESSAGE content</p> </video> 

Answer 1

Depending on the browser, the browser should not show a backup if it supports <video> , even if it does not support the provided codecs ..... Therefore, the behavior that you see in Firefox: the specification requires that the behavior.