But in XML, the form feed character cannot be used, not even by reference.
2.
Some editors, in particular emacs and vi, have built-in commands to page up / down on the form feed character.
3.
The form feed character is sometimes used in plain text files of source code as a delimiter for a page break, or as marker for sections of code.
4.
For example, in HTML 4, & # 12;, which is a reference to a non-printing " form feed " control character, is allowed because a form feed character is allowed.
5.
In Usenet, the form feed character is used by several newsreaders as a " spoiler character ", causing them to automatically hide the following text until prompted, as a way to prevent spoilers from being inadvertently revealed.
6.
This use of the form feed character is not supported by all newsreaders, and is not standardized, although it has appeared in a draft of a Usenet Best Practices document by the IETF's USEFOR working group, as a feature that user agents should ( but are not required to ) support.
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