Tag whose visibility can be toggled easily?

I’m interested in having a tag with which to wrap temporary stuff, comments, etc, that I can easily make visible or invisible, to use for to-do’s and those kinds of comments.

Is there some built-in that already does this? Alternatively, what’s a tag that makes the contents invisible so that I can try to make it on my own?


Apparently, this works

<assign| visibility-flag | true >

<assign| invisible | <macro | arg | <if | visibililty-flag | arg >>> 


Try : Menu -> Insert -> Folded
You can find there many choices…


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Thank you Yibbou! Those certainly seem helpful.