# Browser Runtime and Local App Surface

> The browser app is a local control surface for model selection, verified bytes, WASM transfer, generation, transcript state, and diagnostics.

- Site: TinyRustLM
- Canonical: https://TinyRustLM.mirust.com/browser-runtime/
- Version: 1.3.0
- Updated UTC: 2026-06-29T22:59:10Z

## Local-origin policy

TinyRustLM is presented as a loopback/local static app. The browser fetches local WASM, local .slm files, local manifests, local receipts, and optional selector registry entries. It does not silently call remote model APIs.

- Local WASM
- Local models
- Local manifests
- No remote inference

## Selector registry

A selector registry declares which admitted model routes are eligible in the browser. The registry must carry model byte counts, selector budgets, manifests, adapter-family fields, module-plan receipt routes, and default strategy metadata before entries become selectable.

- selector_model_byte_budget=33554432
- Text sidecar budgets
- q4 default in combined roots
- Route drift rejection

## Transcript and reset

The visible transcript is browser UI state. Runtime Reset clears model generation context. Clear removes transcript display. Keeping those separate prevents UI cleanup from pretending to be a runtime reset, and vice versa.

- Clear transcript
- Reset runtime context
- Free loaded model
- Step-token continuation