This example shows a Sierpinski triangle fractal rendered as an interactive tree-like structure on a Canvas element. The fractal is drawn with recursive triangle subdivision, and the branching depth changes dynamically based on the mouse position. The code uses the Canvas 2D API with `beginPath`, `moveTo`, `lineTo`, and `fill` methods to draw triangles. It accommodates high pixel density displays by scaling the canvas resolution using `window.devicePixelRatio`. The mouse event listener recalculates the depth from the cursor's horizontal position, then clears and redraws the entire fractal.