thumbnail of image too

[FranckCHAMBON]

This is a proposal for an enhancement:

![description of big image](big_image.png){.image}

this could produce a nice thumbnail and a caption using alt_text.

{.image} (or better name) could be used for several kinds of images : png, jpg, svg...

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A slideshow possibility for several contiguous thumbnails would be awesome.

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Only 2c idea,
many thanks for the extension,