The Remote Playback API initiates and controls playback of media on connected remote devices, such as smart TVs with AirPlay or Chromecast capabilities.

The EditContext API allows you to build rich text editors that support advanced text input, such as Input Method Editor (IME) composition, an emoji picker, or other platform-specific editing UI.

You can animate color fonts between two font-palette values.

The showPicker() method for <select> elements shows the dropdown menu or other user interface for picking one of the options.

The Sec-GPC request header indicates that the user does not consent to a website or service selling or sharing their personal information with third parties.

The page-orientation CSS property sets the rotation of a page after pagination. This allows pages with the same size declaration to display with different orientations.

The mask-border CSS property sets how the edges of an element are masked. It is a shorthand for mask-border-outset, mask-border-repeat, mask-border-slice, mask-border-source, and mask-border-width.

Permissions policy violation reporting sends a report to a URL nominated by the Reporting-Endpoints header or the ReportingObserver API when a page violates a policy. You can also use the Permissions-Policy-Report-Only header to receive reports of what might break under a given policy.

The background-clip: text CSS declaration draws the background underneath only the text in the element.

The CreateVirtualSensor WebDriver command creates a virtual sensor for testing applications that use sensor APIs, without the need for real device sensors.

Related website sets declares relationships between sites so the browser allows cookie and storage access between them through methods such as document.requestStorageAccessFor().

The word-break: auto-phrase CSS declaration specifies that wrapping should occur at natural phrase boundaries, especially in CJK languages.

The prefers-reduced-transparency CSS media query sets styles based on whether the user prefers to reduce the amount of transparent effects on their device, for example to improve contrast and legibility.

The ManagedMediaSource API is a MediaSource where the browser manages the memory of source buffers and may evict data if needed.

The font-synthesis-position CSS property sets whether or not the browser should synthesize subscript and superscript typefaces when they're missing from the font.

The navigator.setAppBadge() method allows installed web applications to display an application badge, typically a dot or number shown alongside the application's icon on the device's home screen or application dock.

A web app manifest file provides metadata about the site. The browser can use the metadata to install the site as a standalone application on the user's device. The metadata usually includes the app's name, icon, description, and ways in which the app wishes to integrate with the device.

The overlay CSS property, used as an allow-discrete CSS transition, prevents a top layer element, such as a popover or a <dialog>, from being removed from the top layer before it has finished animating. You can't set the value of the overlay property; only use it as transition property.

The display-mode CSS media query sets styles based on whether the web page is in an ordinary browser tab mode or another mode, such as fullscreen, standalone, or minimal-ui.

A visibility-state performance entry measures the timing of page visibility state changes, such as when a tab is no longer visible or the user has switched to another app.

The baseline-source CSS property controls how inline-level boxes with multiple lines of text are aligned with the surrounding text. By default, which typographic baseline is used depends on the display property value.

The overflow: overlay CSS declaration is an alias to overflow: auto. Historically, it caused non-standard behavior, allowing scrollbars to overlay content without taking up layout space.

Partitioned cookies allow you to opt a cookie into partitioned storage, with a separate cookie jar per top-level site. Also known as Cookies Having Independent Partitioned State or CHIPS.

The IdleDetector API is used to notify a webpage of the user's idle, active, and locked state.

COEP violation reporting sends a report to a URL nominated by the Reporting-Endpoints header or the ReportingObserver API when a page violates its Cross-Origin-Embedder-Policy policy.

The iterationComposite property of a KeyframeEffect object sets whether an animation's iterations are calculated independently ("replace") or are accumulated with the value of the previous iteration ("accumulate").

The gamepad.vibrationActuator property represents a gamepad's haptics hardware, which allows you to control the vibration motors in a gamepad.

The CSSStyleValue and its subclasses represent CSS values as distinct types instead of only strings. Also known as typed OM.

The numeric factory functions, such as CSS.px() or CSS.kHz(), return a CSSUnitValue representing a CSS number value (as in 12px or 440kHz).

The navigator.audioSession API controls how audio playback interacts with other applications. For example, playing music can pause audio from other applications, while ambient audio can play at the same time.