Eventually, this project will be able to analyze JavaScript code and generate appropriate trace tables. In its current state, it serves to visualize JavaScript scope and the scope chain.
When hovering over a scope, all green areas are visible in the current scope. Hovering over a variable highlights its declaration in the source code. Clicking on a scope creates a scope chain visualization at the top, which eliminates variables that are shadowed by variables in narrower scopes, showing only thoe visible from the clicked scope.
The MIT license. See LICENSE for full text.