Intent to Ship: FileAPI: Blob.bytes()

[Chromestatus]

Contact emails

zees...@gmail.com, zi...@chromium.org

Specification

https://www.w3.org/TR/FileAPI

Design docs

No information provided
https://w3c.github.io/FileAPI/#dom-blob-bytes

Summary

The bytes() method of the Blob interface returns a Promise that resolves with a Uint8Array containing the contents of the blob as an array of bytes.

Blink component

Blink>Storage>FileAPI

Web Feature ID

file

Motivation

Before this change developers could not access an ArrayBuffer directly and had to create a Uint8Array view, and some APIs returned different types which leading to inconsistency. To improve this, design principles have changed[1] in w3c tag side, so the spec was updated[2] accordingly. The new spec removes those hassles, and because WebKit, Firefox and Node.js already support it, bringing it to Chromium will improve interoperability as well. [1] https://github.com/w3ctag/design-principles/issues/463 [2] https://github.com/w3ctag/design-principles/pull/480 [3] https://github.com/w3c/FileAPI/pull/198

Initial public proposal

No information provided

TAG review

No information provided

TAG review status

Not applicable

Risks

Interoperability and Compatibility

Safari 18 and Firefox 128 have already shipped the feature.

Gecko: Shipped/Shipping (https://www.firefox.com/en-US/firefox/128.0/releasenotes)

WebKit: Shipped/Shipping (https://webkit.org/blog/15865/webkit-features-in-safari-18-0)

Web developers: No signals

Other signals:

WebView application risks

Does this intent deprecate or change behavior of existing APIs, such that it has potentially high risk for Android WebView-based applications?

No information provided

Debuggability

No information provided

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

Yes
All Blob APIs are exposed and platform-independent, and the bytes() API is also supported on all platforms.

Is this feature fully tested by web-platform-tests?

Yes
https://wpt.fyi/results/FileAPI/Blob-methods-from-detached-frame.html https://wpt.fyi/results/FileAPI/blob/Blob-bytes.any.html https://wpt.fyi/results/FileAPI/blob/Blob-bytes.any.worker.html

Flag name on about://flags

No information provided

Finch feature name

No information provided

Non-finch justification

No information provided

Rollout plan

Will ship enabled for all users

Requires code in //chrome?

False

Estimated milestones

No milestones specified

Anticipated spec changes

Open questions about a feature may be a source of future web compat or interop issues. Please list open issues (e.g. links to known github issues in the project for the feature specification) whose resolution may introduce web compat/interop risk (e.g., changing to naming or structure of the API in a non-backward-compatible way).

No information provided

Link to entry on the Chrome Platform Status

https://chromestatus.com/feature/4830298126417920?gate=5146453756084224

Links to previous Intent discussions

Intent to Prototype: https://groups.google.com/a/chromium.org/d/msgid/blink-dev/688952f5.2b0a0220.35091d.0040.GAE%40google.com

This intent message was generated by Chrome Platform Status.

[Mike Taylor]

Could you please request the Privacy, Security, Enterprise, etc bits in your chromestatus entry?

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[Mike Taylor]

Thanks for requesting those - LGTM1

[Suyeon Ji]

Hi,

Thank you so much for your review. I’ve submitted the request on ChromeStatus as you suggested, and I’m now waiting for the privacy and security reviews.

I’ll let you know once I get the results.

Thanks again!

2025년 10월 28일 화요일 오전 8시 57분 1초 UTC+9에 mike...@chromium.org님이 작성:

[Daniel Bratell]

LGTM2

/Daniel

To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/59083ecb-135c-4993-9493-9564c5dd2099n%40chromium.org.

[Philip Jägenstedt]

LGTM3

To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/548eb3b5-9718-46fc-8c06-7aba4ad48591%40gmail.com.