New Calculator template brings interactivity to Wikipedia articles: https://en.wikipedia.org/wiki/Wikipedia:Wikipedia_Signpost/2025-01-15/Technology_report

The template basically allows the creation of small forms that allow readers to specify some numbers as input and use a formula to generate an output. It's even possible to simulate some simple algorithms step-by-step and expand the form after each step: see for instance an example of this at https://en.wikipedia.org/wiki/Euclidean_algorithm#Procedure