Non-standard: This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
prompt() method of the
BeforeInstallPromptEvent interface allows a developer to show the
install prompt at a time of their own choosing. Typically this will be called in the event handler for the app's custom install UI.
This method must be called in the event handler for a user action (such as a button click) and may only be called once on a given
Promise resolving to an object containing the following properties:
A string indicating whether the user chose to install the app or not. It must be one of the following values:
"accepted": The user installed the app.
"dismissed": The user did not install the app.
If the user chose to install the app, this is a string naming the selected platform, which is one of the values from the
BeforeInstallPromptEvent.platformsproperty. If the user chose not to install the app, this is an empty string.
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