# Browser platform contracts

The reference follows native browser behavior and the host framework. It covers mixed-input focus indication, ownership of deferred focus moves, and responsive control relationships without requiring a global focus manager. It distinguishes feedback latency from the intended unfolding of a response. Runtime claims still require browser evidence.

Package version: 0.1.0-beta.6.

Included with [Faye UI System Engineer](/plugins/faye-ui-system-engineer/).

## Related guides and supporting files

- [Faye UI System Engineer](/plugins/faye-ui-system-engineer/) — Design, build, and review browser interfaces with purposeful visuals, interaction feel, and rendered evidence.

## Technical source

[Open original source](/marketplace/plugins/faye-ui-system-engineer/references/web-platform.md)

Source path: plugins/faye-ui-system-engineer/references/web-platform.md