I feel like it’s high time I revived some interest in my proposal for
button type="share". Last I left it, I was gathering use cases and they seem to suggest that the most common use case for the Web Share API is sharing the URL of the current page.
If you want to catch up on the history of this proposal, here’s what I’ve previously written:
A good example is the Constraint Validation API. For the most common use cases, the
required attribute and
A bad example is the Geolocation API. The most common use case is getting the user’s current location. But there’s no
input type="geolocation" (or
I’ve been thinking about how a lot of recently-proposed APIs end up having to deal with what Chrome devrel’s been calling the “user gesture/activation budget”, and wondering if that’s a good indicator of when something should have been HTML in the first place.
I think he’s onto something here!
button type could be minted?
The Web Share API is a classic example. You can’t invoke the API after an event like the page loading. You have to invoke the API after a user-initiated event like, oh, I don’t know …clicking on a button!
The Fullscreen API has the same restriction. You can’t make the browser go fullscreen unless you’re responding to user gesture, like a click. So why not have
button type="fullscreen" in HTML to encapsulate that? And again, the fallback in non-supporting browsers is predictable—it behaves like a regular button—so this is trivial to polyfill. I should probably whip up a polyfill to demonstrate this.
button type value.
The only potential flaw in this thinking is that some APIs that require a user gesture might also require a secure context (either being served over HTTPS or
localhost). But as far as I know, HTML has never had the concept of features being restricted by context. An element is either supported or it isn’t.
That said, there is some prior art here. If you use
input type="password" in a non-secure context—like a page being served over HTTP—the browser updates the interface to provide scary warnings. Perhaps browsers could do something similar for any new
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