It's interesting to see Zig being chosen here over Rust for a browser engine component. Rust has kind of become the default answer for "safe browser components" (e.g., Servo, Firefox's oxidation), primarily because the borrow checker maps so well to the ownership model of a DOM tree in theory. But in practice, DOM nodes often need shared mutable state (parent pointers, child pointers, event listeners), which forces you into Rc<RefCell<T>> hell in Rust.

Zig's manual memory management might actually be more ergonomic for a DOM implementation specifically because you can model the graph relationships more directly without fighting the compiler, provided you have a robust strategy for the arena allocation. Excited to learn from Lightpanda's implementation when it's out.

TL;DR: It does the following:

- Fetch HTML over the network

- Parse HTML into a DOM tree

- Fetch and execute JavaScript that manipulates the DOM

But not the following:

- Fetch and parse CSS to apply styling rules

- Calculate layout

- Fetch images and fonts for display

- Paint pixels to render the visual result

- Composite layers for smooth scrolling and animations

So it's effectively a net+DOM+script-only browser with no style/layout/paint.

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Definitely fun for me to watch as someone who is making a lightweight browser engine with a different set of trade-offs (net+DOM+style/layout/paint-only with no script)

This is a common flow for me

    lightpanda url | markitdown (microsoft) | sd (day50 streamdown) 

It's solid. Definitely worth a check