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252 bytes added ,  11:00, 28 July 2018
Example for JS toggle
</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}}.

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