<bmx-formula-bar>
A formula editor as a spreadsheet's formula bar has it.
Click a cell, then edit its formula. Type
=VL for suggestions, a function name and
( for its arguments, F4 on a reference for $s, Shift+F3 for the function picker. While a
formula is open, clicking cells inserts references - each in its own colour, outlined in the table too.
Every property, event and method: https://docs.binarymission.co.uk/webcomponents/bmx/bmx-formula-bar.html