[css-device-adapt] consider adding user-overscroll-action descriptor

[majido]

We are collaborating on a new declarative API to give developer a reliable way to control overscroll actions (e.g., swipe navigations, pull-to-refresh, etc.).

Our initial thinking was to use a new CSS attribute but it was pointed out that perhaps a descriptor in the viewport meta tag is a better API particularly because all of the overscroll actions that we care about are only meaningful for viewport.

The proposal is to add user-overscroll-action which will be similar to user-scalable property in the viewport meta in the sense that it provides a directive to user agent on how to interpret a user action in this case overscroll as opposed to zoom.

Do you think such a proposed descriptor is appropriate for css-device-adapt?

/cc @smaug----

[majido]

Friendly ping 😃 (I assume relevant editors triage these issues once get labeled)

As explained we are looking to find the most appropriate API for exposing such controls. Here are the options we have considered so far:

1. A generic CSS attribute (this was the original proposal and it is what we are currently implementing in Blink behind a flag)
2. A new property on viewport meta as part of css-device-adapt (this issue)
3. As an extension to existing "-ms-scroll-chaining" and spec'ed as part of CSSOM View (this was proposed quite recently)

At this point I prefer options 2 or 3 if possible. I appreciate your feedback on this issue which would help guiding us in deciding which of these options to pursue further.

[xfq]

IIUC, this is now called overscroll-behavior?

[jonjohnjohnson]

Guessing this can be closed in light of #2179 resolution ?

[frivoal]

I think so. @majido , is that OK with you?

[majido]

Yes. Please close.

…

On Thu, Jun 21, 2018, 10:07 PM Florian Rivoal ***@***.***> wrote: I think so. @majido <https://github.com/majido> , is that OK with you? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#455 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AA5p_zaWqYwNw6DKs_KFL5FCfITtuCQpks5t_FF2gaJpZM4J35GW> .

[xfq]

Closing.