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This also gives the end-user an opportunity to discern if the web application is spoofing another web application, by, for example, using an unexpected icon or name.It is that user agents prevent other applications from determining which applications are installed on the system (e.g., via a timing attack on the user agent's cache).How a user agent makes use of these installability signals to determine if a web application can be installed is left to implementers.The beforeinstallprompt event is somewhat misnamed, as it does not necessarily signal that an automated install prompt will follow (depending on the user agent, it might just be giving the site the ability to trigger an install prompt). is dispatched when the site is allowed to present a site-triggered install prompt, or prior to the user agent presenting an automated install prompt.This example shows how one might prevent an automated install prompt from showing until the user clicks a button to show a site-triggered install prompt.
This list is not exhaustive and some installability signals might not apply to all user agents.Alternatively, and again as an example, the user agent could install the web application into a list of bookmarks within the user agent itself. Implementers need to be aware that there are privacy and security considerations that directly relate to the installation process.For the purpose of this specification, the once the installation process succeeds in installing the web application (e.g., an icon was successfully placed onto the device's homescreen).Implementors who are not taking part in the discussions will find the specification changing out from under them in incompatible ways.Vendors interested in implementing this specification before it eventually reaches the Candidate Recommendation phase should subscribe to the repository on Git Hub and take part in the discussions. This is a draft document and may be updated, replaced or obsoleted by other documents at any time.
The manner of signaling is left up to implementers, but can include things like showing the URL of the application context, dropping out of fullscreen to the member is declared in the manifest, it is not possible to navigate the top-level browsing context to somewhere outside the scope while the manifest is applied to the top-level browsing context.