Lars Magne Ingebrigtsen wrote:
> I just added displayer callbacks to the URLs from shr and gnus-html,
> which seems clean enough(ish)...

I hope cid images are also controlled by *-blocked-images.  It is
because I often face html messages containing cid images, that are
useless except for a few cases.

As for shr.el, I tried putting it into practice.  A patch is below.
With setting shr-blocked-images to "", `W D W' becomes very useful.
In that case, `g' is the command for turning images off again.

It seems somewhat troublesome to make gnus-html.el work similarly.