An interactive tree fractal rendered on Canvas, where the branching pattern changes in response to mouse movement. The visualization draws a recursive, branching structure from a central trunk, with horizontal mouse position controlling branch length ratio and vertical position controlling the angle between branches. It uses the Canvas 2D API with recursive `drawTree` calls, and accommodates high pixel density displays by scaling the canvas using `devicePixelRatio` and CSS dimensions. The code adapts an example from HTML5Examples.