I do not know if this is easy or standard. I would like to be able to put a tag around a paragraph so that the paragraph is invisible in the main page of a tumblr account, but visible in the post.
A little bit similar conceptually to the [READ MORE] idea, except it just takes out a single paragraph.
My objective (in case there is a better way out there), is to have navigation at the top of the post (above the first paragraph), but for that navigation not to show in the main page where all the posts are listed.
From reading on the web (eg here), it seems that {block:PermalinkPage} can be used to hide text everywhere except the page. So I would either need to create a structure (e.g. or something) inside the html background that takes advantage of this (I don't know if this is possible), or do something similar with code in the actual post.