Chrome 157 Release Notes

Starting in Chrome 157, the Background Fetch API now enforces Cross-Origin Resource Sharing (CORS). This update aligns Chromium's implementation with the intent of the Background Fetch spec. This ensures that Background Fetch requests are subject to the same security policies as regular Fetch requests, such as Local Network Access checks.

This update prevents sites from bypassing CORS (and other security policy checks) by using Background Fetch instead of regular Fetch.

The anchors-valid value was implemented as part of https://crbug.com/329703412 but subsequently reverted, due to spec questions about the exact definition of the value. Since that time, the value has been renamed to anchor-valid (see https://chromestatus.com/feature/5136123851571200) and also better defined to be clear that only the default anchor matters, resolving a lot of ambiguity, and making this value shippable.

CSS text-decoration-inset controls how far underlines, overlines, and line-through decorations are inset from or extended beyond text run edges. It supports auto, length, and percentage values, including one-value and two-value syntax for setting the start and end offsets. This lets developers adjust decoration spacing and create reveal effects with native text decorations instead of background gradients or additional elements.

sampler: https://static.januschka.com/i-468928416/?asddsaasd MDN: https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/text-decoration-inset

CL: https://chromium-review.googlesource.com/c/chromium/src/+/7748204

Adds a <string> value to the text-overflow property.

This allows web authors to specify a custom string (e.g., "(more)") to indicate that text has been clipped. This provides more design flexibility and can be used to create more user-friendly and context-aware overflow indicators.

The CSSWG resolved to rename anchors-valid --> anchor-valid [1] and anchors-visible --> anchor-visible [2]. To accomplish this, we'll rename the properties to the singular variants, and add aliases from the plural versions to the singular versions. At a later date, we will remove the plural variants. This chromestatus is only about shipping the new versions, and deprecating the old ones (but not removing them).

[1] https://github.com/w3c/csswg-drafts/issues/10201#issuecomment-4180411971 [2] https://github.com/w3c/csswg-drafts/issues/10201#issuecomment-4390233490

ProgressEvent is available in service workers, allowing developers to construct progress events with lengthComputable, loaded, and total attributes. This aligns service workers with other worker contexts and the XMLHttpRequest Standard.

Exposes the LanguageDetector JavaScript Web API on Chrome for Android (Clank). This allows web applications to detect text languages locally on mobile devices using fast, privacy-preserving, and offline-capable on-device machine learning models and not rely on cloud endpoints.

BluetoothRemoteGATTServer inherits from EventTarget, exposing the standard addEventListener(), removeEventListener(), and dispatchEvent() methods. This enables connection-level events to be dispatched directly on the GATT server.

HTML-in-canvas enables customizing the rendering of html using canvas with new primitives to manage canvas layout, drawing capabilities, rendering events for DOM-to-canvas synchronization, and geometry update capabilities for canvas-to-DOM synchronization.

Allows the use of 64-bit atomic minimum and maximum operations on atomic<vec2u> in WGSL.

This provides WebGPU shader authors with a way to implement certain algorithms that use 64-bit atomics without requiring full support for 64-bit integers.

Add styleDuration and forcedStyleDuration information to the Long Animation Frame API, enabling developers to distinguish style and layout times.

Expose multiple HTML setting methods that provide a coherent story for dynamically inserting markup into an existing document.

• Positional methods (before/after/append/prepend/replaceWith) that take HTML as argument, effectively replacing insertAdjacentHTML.
• Streaming methods (stream{Append}HTML{Unsafe}) which return a WritableStream, receiving text as input and parsing HMHL.
• Passing {runScripts} as part of SetHTMLUnsafeOptions, mimicking createContextualFragment behavior.
• Supporting createParserOptions in trusted types, allowing trusted types to override scripting mode and sanitizer.

Connection Allowlists (https://chromestatus.com/feature/5175745573945344) is a feature designed to provide explicit control over external endpoints by restricting connections initiated via the Fetch API or other web platform APIs from a document or worker. This aspect of the feature extends Connection Allowlists to support embedded enforcement on iFrames and nested documents/workers. This allows the parent document to enforce restrictions on embedded content where they can choose to opt in or not load.

More details on the proposal can be found here: https://github.com/WICG/connection-allowlists

This feature adds a set of primitives to allow elements to anchor to overscroll areas of other elements. It further allows these elements to be revealed with swipe gestures, similar to scrollers.