This page tests every single Canvas 2D API function implemented in GURT:
Rectangle and circle primitives
Paths, lines, arcs, and shapes
Translate, rotate, scale, save/restore
Quadratic and Bezier curves
Colors, line widths, fonts, text measurement
Multiple techniques combined
Custom fragment shader with animated colors
All canvas functions should render correctly above. Check the browser console for any errors.
This test demonstrates compatibility with HTML5 Canvas API standards.