Bindings between boa-cat (JS engine) and the DOM (html-cat tree) plus fetch (net-cat). v0.7.18 wires form-control inputs to scripts: `<input>.value` and `<input>.checked` accessor-pair properties reflect the corresponding HTML attributes (reads from `__attributes`, writes through), and the `:checked` pseudo-class matches via the attribute presence so `document.querySelector(':checked')` and `el.matches(':checked')` agree with the post-setter state. Sets up the form-control story for a Tauri opt-in backend pitch. Seventh sub-crate of a Servo-replacement webview runtime targeting Tauri.