Hi John,

My first thought is delivering smaller / lower res images that are saved as 
> tiddlers and can be delivered via {{tiddler-image-name}} usage.
>

try this: 
 - define a tiddler eg: myImageMacro and tag it: $:/tags/Macro

\define image(uri, tiddler, altOnline:"online image not found" 
altOffline:"offline image not found")
<$reveal state="offline" type="match" text="">
<$image source="""$uri$""" alt="""$altOnline$"""/>
</$reveal>
<$reveal state=offline type=match text="offline">
<$image source="""$tiddler$""" alt="""$altOffline$"""/>
</$reveal>
\end

Usage: 

<<image uri:"https://example.com/your-image.jpg"; 
tiddler:"your-tiddler-small.jpg">> 

You'll need 2 buttons somewhere to activate and deactivate offline mode eg: 

<$button set="offline" setTo="offline" >
Activate Offline mode!
</$button>
<$button>
<$action-deletetiddler $tiddler="offline"/>
Activate online mode!
</$button>


have fun!
mario

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