The overflow-block and overflow-inline CSS media queries set styles based on the way a device displays content that's larger than the viewport or page area. For example, a laptop lets users scroll to reveal content, while a printer displays overflowing content on additional pages.

The navigator.storage API provides information about the availability and persistence of the data that a site stores on the device, by using APIs such as the Cache API or the IndexedDB API.

The update CSS media query sets styles based on whether and how fast the user's device can modify display after it has been rendered. For example, you can avoid animations on devices that aren't fast enough to display them smoothly.

The contain-intrinsic-size CSS property sets the intrinsic size of an element. When using size containment, the browser will lay out the element as if it had a single child of this size.

The image-set() CSS function provides a set of images at different resolutions or pixel densities, which the browser can pick from, depending on the device capabilities.

The subgrid value for the grid-template-columns and grid-template-rows properties allows a grid item to inherit the grid definition of its parent grid container.

The dirname attribute of <textarea> and <input> HTML elements includes the field's writing direction as form data on submission.

The display CSS property accepts multiple keyword values, such as inline flex or block flow, to explicitly set an element's inner and outer layout mode. Also known as 2-value, multi-keyword, or multiple value syntax.

The toReversed(), toSorted(), toSpliced(), and with() methods of arrays and typed arrays return changed copies of arrays. They stand in contrast to methods such as sort() or reverse() that change arrays in place.

The animation-composition CSS property chooses how to combine animations that affect the same property.

The Worker() constructor accepts { type: "module" } to load scripts that use import and export. Also known as ECMAScript modules or ESM in workers.

The e, pi, infinity, and NaN keywords represent well-defined constants accepted in CSS math functions such as calc().

The window.print() method opens the browser's print dialog.

The of syntax for the :nth-child() and :nth-last-child() CSS functional pseudo-classes match elements by the relative position of elements, counted from the first or last sibling matching a selector list.

The CompressionStream and DecompressionStream APIs compress and decompress data using the gzip or deflate formats.

The CIE Lab color space expresses colors in terms of lightness and how red/green and blue/yellow a color is. LCH is a variant of Lab with polar coordinates. These color spaces can be used with the CSS color(), lab(), and lch() functions. Also known as CIELAB and CIELCH.

The Oklab color space expresses colors in terms of lightness and how red/green and blue/yellow a color is, aiming to match how humans perceive colors. OkLCh is a variant of Oklab with polar coordinates. These color spaces can be used with the CSS oklab() and oklch() functions.

The sctp object on RTCPeerConnection represents the negotiated SCTP transport. SCTP (Stream Control Transmission Protocol) is the protocol that RTCDataChannel uses.

The color() function picks a color from a given color space. Wide gamut color spaces like display-p3 allow showing more vibrant and saturated colors than the standard srgb color space.

The color-mix() function mixes two colors in a given color space and by a given amount. Commonly, lighter or darker variations of a color are created by mixing with white or black.

The createConicGradient() methods draw a conic gradient to a 2D canvas.

The roundRect() methods draw a rounded rectangle to a 2D canvas.

The inert HTML attribute marks an element and its descendants as non-interactive. Inert elements don't get focus or fire click events.

The CSSStyleSheet constructor creates a new stylesheet which can be shared between a document and multiple shadow roots using adoptedStyleSheets.

128-bit SIMD (Single Instruction Multiple Data) performs one instruction on multiple units of data, when running on hardware that supports such instructions. Also known as vector instructions.

Custom elements may act like built-in form elements, via the attachInternals() method of HTMLElement and the ElementInternals API.

The assign() method for <slot> elements assigns nodes to the slot, as an alternative to using the slot and name HTML attributes. The nodes must be children of a shadow host and the shadow root must be created with the slotAssignment set to "manual". Also known as manual slot assignment.

A <script type="importmap"> HTML element provides an import map as a JSON string. An import map controls how the browser should resolve module specifiers when importing JavaScript modules.

The range syntax of CSS media queries allows you to use mathematical comparison operators such as <, >, <=, and >= to define a range of values for a media query. For example, (400px < width < 1000px) returns true if the viewport width is between 400px and 1000px.

Notifications via service worker registration's showNotification() method, sent from installed web applications (for example, saved to the Home Screen on Safari for iOS), show a message to the user, typically using the notification system of the host operating system.