Build Prototype

Build a disposable but finished-looking model of the whole surface so the user can settle structure, relationships, and behavior before implementation.

Separate the product layer from the decision layer: prototype.html holds the canonical product screens and flows; a temporary compare.html resolves the user's current question in its specific situation. Scope the comparison by what the decision needs, whether a component, a screen, or a short flow.

When it is unclear where the user needs to open the preview, ask once whether they will review it only on the computer running the work or also on another device. Use a nonblocking question when the host supports one; otherwise finish the access-independent build before asking. Do not infer the review device from the execution host or treat no answer as a choice. Select the execution and hosting method from the available environment; do not prescribe a particular platform.