Declarative APIFactory functions like circle(), rect(), and axes() with sensible defaults. Destructure what you need from createScene().
AnimationsAsync/await animation system — fadeIn, shift, rotate, scale, color transitions. Sequential or simultaneous, no queues.
InteractiveDraggable shapes, hover effects, click handlers, and HTML controls (sliders, checkboxes) that auto-render on change.
Calculus-ReadyFunction graphs with discontinuities, tangent lines, annotations, braces, and TeX rendering via KaTeX.