garu...@azules.eu schrieb am 20.04.2024 um 23:00:
I can not figure out why this progress bar only works when \showframe is 
activated.
When you comment on \showframe, it's as if \realpageno is at zero.
(current version: 2024.04.01 08:59)

\showframe

\startuseMPgraphic{MonGraphisme_MP}
   numeric n ; n := \number\realpageno ;
   numeric m ; m := \number\lastpageno ;
   numeric h ; h := \overlayheight ;
   numeric w ; w := \overlaywidth ;
   numeric e ; e := 3mm;
   numeric r ; r := (((n-1)/(m-1))*w);
   fill fullsquare xscaled w yscaled e shifted (w/2, h/2) withcolor darkblue ;
   fill fullsquare xscaled r yscaled e shifted (r/2, h/2) withcolor darkred;
\stopuseMPgraphic

\defineoverlay [MonGraphisme_OL] [\useMPgraphic{MonGraphisme_MP}]

\setupbackgrounds [footer] [rightmargin] [background={MonGraphisme_OL}]

\starttext
\dorecurse{10}{\input tufte\page}
\stoptext

Any clue is warmly welcome

You need

    \setupbackgrounds[state=repeat]

which is set when you use \showframe.

Wolfgang

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