=4cm]
{\blackrule[width=1pt, height=\vsize, depth=0.5ex]}
\setupbackgrounds[page][background=mybg]
\setuptolerance[tolerant,stretch]
\starttext
\input knuth
\page
\input knuth
\stoptext
\newconditional\placeRULE
\definelayer[rule][state=repeat]
\setlayer[rule][x=.5\textwidth
\placelistofsynonyms
\placelocalfootnotes[settings]
\placelogos[names]
\placeongrid[settings{text}
\placeontopofeachother{text}{text}
\placereferencelist[names]
\placeregister[name][settings]
\placeregister[settings]
\placerule[name]
\placesidebyside{text}{text}
\placesubformula[references]{text
---
\starttext
Rule:
\definerule[A][spacebefore=2pt]
\placerule[A]
\stoptext
---
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