Function render_node_to_buffer 

pub fn render_node_to_buffer(
    node: &RenderNode,
    buffer: &mut ScreenBuffer,
    clip_rect: &Rect,
    parent_bg: Option<Color>,
)

Renders a node and its children to the screen buffer with clipping and background inheritance.

Clipping Strategy

This function uses two different clip rectangles:

1. element_clip: Used for rendering the element itself (border, background)

   • Always the intersection of node bounds and incoming clip_rect
   • Ensures the element doesn’t render outside its parent’s clip area

2. children_clip: Used for clipping child elements

   • When overflow:hidden, clips to padding box (CSS behavior)
   • When overflow:none, uses parent’s clip_rect unchanged

CSS Box Model & Clipping:
┌─────────────────────────┐ ← node_bounds
│ Border                  │
│ ┌─────────────────────┐ │ ← padding_box (overflow:hidden clips here)
│ │ Padding             │ │
│ │ ┌─────────────────┐ │ │ ← content_box
│ │ │                 │ │ │
│ │ │    Content      │ │ │
│ │ │                 │ │ │
│ │ └─────────────────┘ │ │
│ └─────────────────────┘ │
└─────────────────────────┘

overflow:hidden clips at padding edge (includes padding, excludes border)
overflow:none allows children to render outside all bounds