hereContextual
Provides the current location in the document.
You can think of here as a low-level building block that directly extracts
the current location from the active context. Some other functions use it
internally: For instance, counter.get() is equivalent to
counter.at(here()).
Within show rules on locatable elements, here()
will match the location of the shown element.
If you want to display the current page number, refer to the documentation
of the counter type. While here can be used to determine the physical
page number, typically you want the logical page number that may, for
instance, have been reset after a preface.
Examples
Determining the current position in the document in combination with the
position method:
#context [
I am located at
#here().position()
]

Running a query for elements before the current position:
= Introduction
= Background
There are
#context query(
selector(heading).before(here())
).len()
headings before me.
= Conclusion

Refer to the selector type for more details on before/after selectors.