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< [[Layers]] | [[Visuals]] | [[Presentations]] > PDF has a concept of layers that you can enable and disable (at least in a few viewers). The official name is “optional content groups” (OCG). This has nothing to do with ConTeXt’s [[Layers]].
add OCG hint
There’s no other documentation yet, maybe have a look into the sources {{src|attr-lay.mkiv}}, {{src|attr-lay.lua}} and {{src|lpdf-ren.lua}}. It’s also used in some presentation styles.
</texcode>
You can switch the visibility of layers with the JavaScript functions HideLayer and VideLayer(from {{src|scrn-fld.mkvi}}: <texcode>\defineviewerlayer[test] \startviewerlayer[test]Hide Me\stopviewerlayer \defineoverlay [WithTest] [{\overlayrollbutton[HideLayer{test}][VideLayer{test}]}] \framed[background=WithTest]{toggle}</texcode>
Viewer layers are known to work within {{cmd|setlayer}} (see [[Layers]]), e.g. {{src|meta-ini.mkiv}}.
[[Category:PDF]]
[[Category:Presentation]]
[[Category:Layout]]
