Intent to Implement and ship: fractional PointerEvents.offsetX/Y

[eir...@chromium.org]

Contact emails

eir...@chromium.org

Spec

https://drafts.csswg.org/cssom-view/#extensions-to-the-mouseevent-interface

Summary

Expose full precision for PointerEvent.offsetX/Y as other pointerevent coordinates.

Motivation

pointerevent fractional coordinates were shipped from M64, including cllientX/Y, screenX/Y, pageX/Y and X/Y, but offsetX/Y were left behind. We received a request about providing full precision for offsetX/Y as well.

Compatibility and Interoperability Risks

The risk show be low since we already shipped full precision for other PE coordinates from M64, user will expect seeing fractional value for offsetX/Y as well.

Edge/IE expose fractions for offsetX/Y together with other PE coordinates.

Firefox has all PE coordinates in integer.

Safari doesn’t have PointerEvent.

Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?

Yes

Link to entry on the feature dashboard

(I don't think it needs a dashboard entry, but will create one if anyone think it does)

Requesting approval to ship?

Yes

[Rick Byers]

LGTM1

Like for the others, I assume this won't effect the offsetX/Y values returned from MouseEvent, right?

If so this is probably pretty close to the "bug fix only" end of the risk spectrum - sites using pointer events are already prepared for fractional values and it's just weird that offsetX/Y were an exception. I wouldn't bother with a chromestatus entry or mention in the blog post (and even doing an intent is perhaps overkill IMHO).

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[Ella Ge]

Right, it's definitely not affecting mouseevent.offsetX/Y.

[Chris Harrelson]

LGTM2

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[Yoav Weiss]

LGTM3

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