HTMX is the HTML extension syntax that replaces JavaScript with simple markup. It could change the course of web development.

The command line allows you to enter and execute JavaScript commands straight from the Firebug sidebar. The functions available in the API allows you to maneuver, monitor and investigate web page ...

As you unlock various demo levels on the Cue’s Coding palette, you eventually open up the full JavaScript command palette, and can work with functions and variables.