update backend comparison

Author: junkdog

src/backend/mod.rs

@@ -4,11 +4,11 @@
 //! each with different performance characteristics and trade-offs:
 //!
 //! - [`WebGl2Backend`]: GPU-accelerated rendering powered by [beamterm][beamterm]. Uses prebuilt
-//!   font atlases. Best performance, capable of 60fps on large terminals (300x100+).
+//!   or runtime generated font atlases. Best performance, capable of 60fps on large terminals.
 //!
 //! - [`CanvasBackend`]: Canvas 2D API with full Unicode support via browser font rendering.
-//!   Good fallback when WebGL2 isn't available or when dynamic character support is required.
-//!   Does not support hyperlinks or text selection, but can render dynamic Unicode/emoji.
+//!   Good fallback when WebGL2. Does not support hyperlinks or text selection, but can render
+//!   dynamic Unicode/emoji.
 //!
 //! - [`DomBackend`]: Renders cells as HTML elements. Most compatible and accessible,
 //!   supports hyperlinks, but slowest for large terminals.
@@ -17,24 +17,29 @@
 //!
 //! ## Backend Comparison
 //!
-//! | Feature                      | DomBackend | CanvasBackend | WebGl2Backend    |
-//! |------------------------------|------------|---------------|------------------|
-//! | **60fps on large terminals** | ✗          | ✗             | ✓                |
-//! | **Memory Usage**             | Highest    | Medium        | Lowest           |
-//! | **Hyperlinks**               | ✓          | ✗             | ✓                |
-//! | **Text Selection**           | ✓          | ✗             | ✓                |
-//! | **Accessibility**            | ✓          | Limited       | Limited          |
-//! | **Unicode/Emoji Support**    | Full       | Full          | Limited to atlas |
-//! | **Dynamic Characters**       | ✓          | ✓             | ✗                |
-//! | **Font Variants**            | ✓          | Regular only  | ✓                |
-//! | **Underline**                | ✓          | ✗             | ✓                |
-//! | **Strikethrough**            | ✓          | ✗             | ✓                |
-//! | **Browser Support**          | All        | All           | Modern (2017+)   |
+//! | Feature                      | DomBackend | CanvasBackend | WebGl2Backend  |
+//! |------------------------------|------------|---------------|----------------|
+//! | **60fps on large terminals** | ✗          | ✗             | ✓              |
+//! | **Memory Usage**             | Highest    | Medium        | Lowest         |
+//! | **Hyperlinks**               | ✓          | ✗             | ✓              |
+//! | **Text Selection**           | ✓          | ✗             | ✓              |
+//! | **Accessibility**            | ✓          | Limited       | Limited        |
+//! | **Unicode/Emoji Support**    | Full       | Full          | Full¹          |
+//! | **Dynamic Characters**       | ✓          | ✓             | ✓¹             |
+//! | **Font Variants**            | ✓          | Regular only  | ✓              |
+//! | **Underline**                | ✓          | ✗             | ✓              |
+//! | **Strikethrough**            | ✓          | ✗             | ✓              |
+//! | **Browser Support**          | All        | All           | Modern (2017+) |
+//!
+//! ¹: The [dynamic font atlas](webgl2::WebGl2BackendOptions::dynamic_font_atlas) rasterizes
+//!    glyphs on demand with full Unicode/emoji and font variant support. The
+//!    [static font atlas](webgl2::WebGl2BackendOptions::font_atlas) is limited to glyphs
+//!    included at atlas build time.
 //!
 //! ## Choosing a Backend
 //!
 //! - **WebGl2Backend**: Preferred for most applications - consumes the least amount of resources
-//! - **CanvasBackend**: When you need dynamic Unicode/emoji or must support non-WebGL2 browsers
+//! - **CanvasBackend**: When you must support non-WebGL2 browsers
 //! - **DomBackend**: When you need better accessibility or CSS styling
 
 /// Canvas backend.