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Sharing/API
This is a proposal for user agent managed sharing on the web.
Introduction
A share endpoint, e.g. bookmarks.example, can register itself with a user agent through an API. Afterwards, when a user visits a site, they can activate user agent UI to share the current URL with a page on bookmarks.example presented in an overlay browsing context (typically shown on top of the current document within the top-level browsing context).
Think of it as exposing bookmark functionality to third-party services.
User agent
The user agent has a list of share endpoints. Each share endpoint consists of a URL, optionally an icon, optionally a title, and optionally a size.
Issue: Do we need a description for other parts of user agent UI? Issue: Ensure title cannot be abused for spoofing.
The user agent exposes the ability to share the top-level browsing context's document's URL with a share endpoint picked by the user.
A share endpoint can add itself to a user agent's list of share endpoints.
Promise<boolean> addShareEndpoint(shareEndpointURL, {icon, title, size})
Promise<boolean> deleteShareEndpoint(shareEndpointURL)
Proimse<boolean> hasShareEndpoint(shareEndpointURL)
Issue: Allow one or multiple share endpoints per origin?
Overlay browsing context
Sized according to hints give by developer.
Can be dismissed through window.close().
Issue: Does this need the history API?