The container option of the scrollIntoView() method sets which ancestor scroll container to scroll. The "nearest" value scrolls only the nearest ancestor, instead of the default "all".

The scheduler API provides a way to prioritize all tasks belonging to an application.

The @function CSS at-rule defines a custom function that takes CSS values or custom properties as arguments, and returns a CSS value. It can be based on conditional logic such as by using the @media at-rule.

The payment extension of a web authentication credential allows a relying party (such as a bank) to create a credential that can be queried by any merchant origin as part of an online checkout that uses the Payment Request API's secure-payment-confirmation payment method. Also known as SPC.

The SpeechRecognition API converts audio into text using the device's speech recognition service.

The corner-shape CSS property sets the shape of an element's corners when using border-radius, allowing for shapes other than rounded corners. For example, corner-shape: squircle is a shape in between a square and rounded corner.

The closedby HTML attribute for <dialog> sets which user actions close a dialog. For example, closedby="any" allows the dialog to be closed by clicking outside of it.

The using and await using declarations and the dispose and asyncDispose symbols manage the lifecycle of resources such as file handles and streams. The DisposableStack and AsyncDisposableStack objects can group, dispose, and coordinate dependencies between multiple disposable resources.

The font-variant-emoji CSS property sets the default presentation for emoji characters.

The Summarizer API uses an on-device language model to summarize text.

The viewport segment CSS environment variables and media features, and the viewport.segments API, allow you to adapt your layout to devices where the display is split, such as on foldable devices.

The CookieStore API is an asynchronous and promise-based API for managing cookies. It does not rely on document and so is available to service workers as well.

The if() CSS function is an inline conditional value that returns a value based on a set of conditions.

The reading-flow CSS property sets the order in which flex or grid elements are rendered to speech or reached via focus navigation. The reading-order property overrides this order.

The dynamic-range-limit CSS property controls the peak luminance of high dynamic range content. You can use this to coordinate the apparent brightness of HDR and SDR content.

The Clear-Site-Data header deletes browsing data (such as cookies, storage, or cache) associated with the requesting website.

The Error.isError() static method checks whether a value is an Error object.

The ::column CSS pseudo-element represents the individual columns of a multi-column layout container. Columns can only be styled with scroll snap CSS properties and can also have a ::scroll-marker pseudo-element, which scrolls to the column when activated.

The ::scroll-button(<dir>) CSS pseudo-element is a focusable button which scrolls its originating scroll container element in the specified direction.

The when() method on a event target returns an Observable object, which provides a declarative API for subscribing to and operating on events. It's an alternative to addEventListener() callbacks.

A scroll marker scrolls a container to a scroll target. The ::scroll-marker CSS pseudo-element selects a scroll marker in a ::scroll-marker-group pseudo-element, generated before or after the scroll container. You can use them to navigate and style tables of contents, tab panels, and carousels.

The fetchLater() method requests a deferred fetch sent at an unknown time. The browser chooses a reliable time to send the request, ideally when the document is unloaded, and ignores the response. This API is useful for sending beacons to a server without expecting a particular response.

The interactivity: inert CSS declaration makes an element and its descendants inert, like when using the inert HTML attribute. Inert elements can't be focused or clicked, their text can't be selected or found using the browser's find-in-page feature.

The hyphenate-limit-chars CSS property sets the number of characters in a word before it is hyphenated and the minimum number of characters on either side of the hyphen.

Multiple <script type="importmap"> HTML elements merge to produce the overall import map.

The ability to control the opacity of a color picked using <input type="color"> and determine the colorspace of the selected color.

The font-width CSS property selects a font face from a font family based on width, either by a keyword such as condensed or a percentage.

The name="application-title" attribute for the <meta> HTML element sets an installed web application's title bar text.

The window.getDigitalGoodsService API connects to stores or billing services for in-app products and subscriptions.

The withLock option to set(), append(), delete(), clear(), and batchUpdate() methods of the sharedStorage API prevents duplicate reporting from cross-site race conditions.