Discover some of the interesting features that have landed in stable and beta
web browsers during November 2024.
 Rachel Andrew Technical Writer [GitHub](https://github.com/rachelandrew) [LinkedIn](https://www.linkedin.com/in/rachelandrew) [Mastodon](https://front-end.social/@rachelandrew) [Bluesky](https://bsky.app/profile/rachelandrew.bsky.social) [Homepage](https://rachelandrew.co.uk)
Published: November 27, 2024
## Stable browser releases
In November 2024, [Firefox
133](https://developer.mozilla.org/docs/Mozilla/Firefox/Releases/133) and
[Chrome 131](https://developer.chrome.com/release-notes/131) became stable. This
post looks at the new features added to the web platform.
> [!NOTE]
> **Note:** Browser compatibility data pulled from MDN is included in these posts and may not have been updated yet for very recent browser releases. The post will show the correct information as soon as it appears in the [browser-compat-data release](https://github.com/mdn/browser-compat-data/releases).
### WebCodecs API
Firefox 133 supports the `ImageDecoder`, `ImageTrackList`, and `ImageTrack`
interfaces of the
[WebCodecs API](https://developer.mozilla.org/docs/Web/API/WebCodecs_API),
enabling the decoding images from the main and worker threads.
Browser Support
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[Source](https://developer.mozilla.org/docs/Web/API/ImageDecoder)
### The `WorkerNavigator` `permissions` property
Firefox 133 also supports
[`WorkerNavigator.permissions`](https://developer.mozilla.org/docs/Web/API/WorkerNavigator/permissions).
Browser Support
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[Source](https://developer.mozilla.org/docs/Web/API/WorkerNavigator/permissions)
### `@page` margin boxes
Chrome 131 adds support for page margin boxes, when printing a web document,
or exporting it as PDF.
The `@page` margin boxes let you define the contents in the margin area of a
page, for example to provide custom headers and footers,
rather than using the built-in headers and footers generated by the browser.
Counters are also supported, for page numbering.
The specification defines two special counter names:
`page` for the current page number and `pages` for the total number of pages.
Learn more in
[Add content to the margins of pages printed using CSS](https://developer.chrome.com/blog/print-margins).
### Support for `currentcolor` in relative color syntax
Chrome 131 allows relative colors in CSS (using the `from` keyword) to use
`currentcolor` as a base. This lets you set complementary colors,
based on an element's text color, for that element's borders, shadows,
or backgrounds.
### `Uint8Array` methods
Firefox 133 adds a number of new `Uint8Array` methods to ease conversions
between `base64-` and hex-encoded strings and byte arrays:
- `Uint8Array.fromBase64()` and `Uint8Array.fromHex()`
- `Uint8Array.prototype.setFromBase64()` and `Uint8Array.prototype.setFromHex()`
- `Uint8Array.prototype.toBase64()` and `Uint8Array.prototype.toHex()`
Browser Support
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[Source](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array/fromBase64)
### WebHID on dedicated workers
Chrome 131 enables `WebHID` inside dedicated worker contexts.
This lets you perform heavy I/O and processing of data from a HID device on a
separate thread, helping to reduce the performance impact on the main thread.
Browser Support
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## Beta browser releases
Beta browser versions give you a preview of things that will be in the next
stable version of the browser. It's a great time to test new features, or
removals, that could impact your site before the world gets that release. New
betas are [Firefox 134](https://developer.mozilla.org/docs/Mozilla/Firefox/Releases/134),
[Safari 18.2](https://developer.apple.com/documentation/safari-release-notes/safari-18_2-release-notes),
and
[Chrome 132](https://developer.chrome.com/blog/chrome-132-beta).
These releases bring many great features to the platform.
Check out the release notes for all of the details. Here are just a few
highlights.
Safari 18.2 includes the `Uint8Array` methods, mentioned earlier in this post as
shipping in Firefox, and the `@page` margin descriptors that shipped in Chrome
this month.
There's a good list of new CSS features, including support for
cross-document view transitions, `ruby-align`, and `text-box-trim`.
Chrome 132 includes support of `sideways-rl` and `sideways-lr` keywords for
the `writing-mode` CSS property, toggle events for `