Help: /builtin
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Tcl 2019 Conference, Houston/TX, US, Nov 4-8
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The "/builtin" page:

URL:  builtin/FILENAME

Return the built-in text given by FILENAME.  This is used internally 
by many Fossil web pages to load built-in javascript files.

If the id= query parameter is present, then Fossil assumes that the
result is immutable and sets a very large cache retention time (1 year).