# ADR 0004 — UI render helper (escape + tagged templates + fragment + renderInto)

**Date:** 2025-09-02

## Context

We want a tiny rendering utility with safe defaults (escaped HTML), raw opt-in, and convenient DOM insertion—without introducing a framework or build step.

## Decision

- Add `src/ui/render.js` providing:
  - `escapeHtml`, `raw`, `html` (tagged template), `fragment`, and `renderInto`.
- Cover with unit tests in `tests/ui.render.test.mjs`.
- Keep adoption optional and incremental; usage can be introduced in `script.js` at low risk.

## Consequences

- Safer string rendering out of the box; clear opt-in for trusted HTML only.
- Simple, testable building block as we gradually refactor UI code.