Limited Availability
30 featuresThe 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 :has-slotted CSS pseudo-class matches <slot> elements where the fallback content is not shown. The pseudo-class matches any slotted content, including white space, text nodes, or elements.
The protected audience API facilitates advertisement sales by allowing sites to register users as part of an interest group or to choose which ads appear based on those interest groups, while minimizing the ability of advertisers to track specific members of the interest group. Also known as FLEDGE.
The attribution reporting API measures when an ad click or view leads to a conversion, such as a purchase on an advertiser site.
Container scroll-state queries with the @container scroll-state(...) at-rule apply styles to an element based on the sticky positioning, snapped, and scrollable state of the container.
Instructions accept 64-bit memory indexes.
The scroll-initial-target: nearest CSS declaration sets the initial scroll position of its scroll container to the top of the element, much like scrolling to a URL fragment.
The text-box CSS property sets the spacing above and below text based on a font's typographic features. For example, text-box: trim-both ex alphabetic trims the top to the top of the letter x and the bottom to the bottom of most letters, without descenders.
The device posture API and the device-posture CSS media feature reflect the physical posture of a device, such as whether a foldable device is folded or unfolded.
The restrictTo() method on screen capture media tracks limits capture to a specific element, excluding content which might occlude the element itself, such as video conferencing controls.
The showOpenFilePicker(), showDirectoryPicker(), and showSaveFilePicker() methods request access to files and directories on the user's device and returns a handle for reading and writing to them.
The WebAssembly builtin string functions mirror a subset of the JavaScript String API and adapt it to be efficiently callable without JavaScript glue code.