Contact emails
[email protected], [email protected]

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 (eg links to known github issues in the project 
for the feature specification) whose resolution may introduce web 
compat/interop risk (eg, 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.

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