Display MNG and JNG using the <img> tag

MNG is the animated companion PNG never got: same chunk structure, but able to hold a sequence, and JNG is its single-frame variant carrying JPEG data instead of PNG. Neither is supported by any browser today. Decoded here with libmng_1.

MNG (MNG-VLC, one frame)

JNG (JPEG data in a PNG-style container)

Code snippet

<img is="universal-img_1" src="testcard_vlc.mng" using="solver_minimal_1"
     with="libmng_1"> </img>

Specifications :

The specifications of the test sequence are :