Intent to Implement and Ship: DataTransfer constructor

[Gary Kačmarčík (Кошмарчик)]

Contact emails

gar...@chromium.org

Spec

https://html.spec.whatwg.org/multipage/interaction.html#the-datatransfer-interface

Tests: http://w3c-test.org/html/editing/dnd/datastore/datatransfer-constructor-001.html

Summary

The new asynchronous clipboard API makes use of DataTransfer objects and has a need to be able to construct new ones.

For example (with new clipboard api):

var data = new DataTransfer();

data.items.add("\(°o°)/", "text/plain");

navigator.clipboard.write(data).then(function() {

    console.log(“Copied to clipboard successfully! ᕕ( ᐛ )ᕗ”);

}, function() {

    console.error(“Unable to write to clipboard. (╯ಠ_ಠ)╯︵ ┻━┻”);

});

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

Yes.

Interoperability and Compatibility Risk

This feature is part of the Async Clipboard API discussion, which has received positive feedback from FF/Edge/Safari and web developers.

For this specific feature, various FF developers were involved in discussions when updating the HTML spec to include this:

* https://github.com/whatwg/html/issues/2190

* https://github.com/whatwg/html/pull/2372

Interop risk is low since this is simply adding a constructor to the DataTransfer object. No other changes to DataTransfer are included.

OWP launch tracking bug

crbug.com/677564 (Shared with Async Clipboard API)

Entry on the feature dashboard

https://www.chromestatus.com/feature/5146128253190144

Changelist

https://codereview.chromium.org/2784473003/

[Chris Harrelson]

LGTM1

I see there is also a web-platform-test for this constructor. Great!

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[Dimitri Glazkov]

LGTM2

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[Rick Byers]

LGTM3

LGTM2

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[Jochen Eisinger]

Please ensure that either you have security approval on the launch bug (crbug.com/677565) before shipping this, or that the security review is triggered early enough, and you are confident that you can incorporate any requests they might have before the branch point.

LGTM3

LGTM2

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[Gary Kačmarčík (Кошмарчик)]

We have security (et al) reviews planned for the Async Clipboard API, but did not think they were required for adding a constructor to an existing type.

Does it require a separate review? If so, I'll have to split that out into a separate bug.

LGTM3

LGTM2

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[Jochen Eisinger]

ah, I just concluded from your example that the clipboard API was already a thing, and was just worried that there wasn't progress on the security review yet.

No need to block the constructor on the review!

LGTM3

LGTM2

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[Gary Kačmarčík (Кошмарчик)]

Oh good. I was worried that I needed to re-calibrate my internal threshold for items should trigger a security review. ^_^

LGTM3

LGTM2

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