[1] Detect if your Native app is installed from your web site | Web | Google Developers () <https://developers.google.com/web/updates/2017/04/getinstalledrelatedapps>
[2] WICG/get-installed-related-apps: get-installed-related-apps () <https://github.com/WICG/get-installed-related-apps/>
[3] get-installed-related-apps/EXPLAINER.md at master · WICG/get-installed-related-apps () <https://github.com/WICG/get-installed-related-apps/blob/master/EXPLAINER.md>