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Published: August 25, 2026
Chrome 152 is rolling out now, and this post shares some of the key features from
the release. Read the full [Chrome 152 release notes](https://developer.chrome.com/release-notes/152.md.txt).
Highlights from this release:
- [`CSSPseudoElement` support for additional pseudo-elements](https://developer.chrome.com/blog/new-in-chrome-152.md.txt#csspseudoelement) extends the interface to `::backdrop`, `::scroll-marker`, and `::view-transition`.
- [CPU Performance API](https://developer.chrome.com/blog/new-in-chrome-152.md.txt#cpu-performance-api) lets web applications determine the CPU performance of a user device.
- [Connection Allowlists](https://developer.chrome.com/blog/new-in-chrome-152.md.txt#connection-allowlists) provides explicit network-level control over external endpoints using an HTTP response header.
## `CSSPseudoElement` support for `::backdrop`, `::scroll-marker`, and `::view-transition`
Support for `CSSPseudoElement` in JavaScript, previously defined for `::after`, `::before`, and `::marker`, extends to several new pseudo-elements in Chrome 152:
- `::backdrop`: Lets you handle interactions on modal dialog backdrops. For example, you can close a dialog when a user clicks the backdrop without interfering with clicks inside the dialog content, eliminating the need for complex intersection calculations.
- `::scroll-marker`: Enables interaction handling on scroll markers, such as collecting click statistics.
- `::view-transition`: Paves the way for geometry-aware view transitions and intercepting an active view transition mid-flight using coordinates of currently animating elements.
For more details on interacting with pseudo-elements in JavaScript, see the [CSSPseudoElement documentation on MDN](https://developer.mozilla.org/docs/Web/API/CSSPseudoElement).
## CPU Performance API
Chrome 152 introduces the CPU Performance API, which lets web applications determine the CPU performance of a user device.
Web applications can use this tier information to adapt the user experience to the device capabilities---such as scaling graphical fidelity, adjusting heavy computations, or tailoring background tasks. This API can also be used in combination with the Compute Pressure API, which provides real-time data about CPU pressure and utilization.
Users can override the reported performance tier in Chrome browser **Settings \> Performance \> Speed \> Override CPU performance tier** . Administrators can also control this behavior using the [`CpuPerformanceTierOverride`](https://chromeenterprise.google/policies/#CpuPerformanceTierOverride) enterprise policy.
## Connection Allowlists
Chrome 152 ships Connection Allowlists, a security mechanism that provides explicit control over external endpoints by restricting network connections initiated by a document or web worker.
Connection Allowlists provide a direct method to address these risks by making the browser the gatekeeper of all network connections originating from your page. By including the `Connection-Allowlist` HTTP response header, a site specifies the exact URL patterns permitted for all network communication initiated by its context.
To learn more about configuration and reporting options, read [Connection Allowlists origin trial](https://developer.chrome.com/blog/connection-allowlists-origin-trial.md.txt).
## Further reading
This covers only some key highlights. Check the following links for additional
changes in Chrome 152:
- [Release notes for Chrome 152](https://developer.chrome.com/release-notes/152.md.txt).
- [ChromeStatus.com updates for Chrome 152](https://chromestatus.com/features#milestone%3D152).
- [Chrome release calendar](https://chromiumdash.appspot.com/schedule).
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