The capture handle API allows you to share a custom handle (a string) from a web application being captured by getDisplayMedia() to the capturing web application.

In columnar layouts (created by the columns or column-count CSS properties), the break-after, break-before, break-inside properties control where columns start or end.

The file_handlers web app manifest member registers an installed web app as a handler for files with specific file extensions or MIME types.

The video-dynamic-range CSS media query sets styles based on whether a device can display video with at least standard range colors or at least high range colors. Non-visual devices will match neither.

The NDEFReader API reads and writes messages to near-field communication (NFC) tags.

The attributionsourceid and attributiondestination attributes for <a> elements measure clicks across websites without associating a click to a specific session. Not to be confused with attribution reporting. Also known as PCM.

The background-attachment CSS property sets whether an element's background image or gradient moves as the element scrolls.

The color-adjust shorthand CSS property allows multiple performance related color adjustments to be set at once. Setting the print-color-adjust CSS property directly is preferred, as it is the only such adjustment so far defined.

The path() CSS shape function creates a shape for clip-path, shape-outside, and the SVG attribute d.

The reversed() CSS function for counter-reset creates a counter that counts down.

The navigator.deviceMemory property is the approximate amount of device memory, in gigabytes.

The optional colorSpace parameter of a 2D canvas's getContext() method chooses the color representation, such as "srgb" or "display-p3".

The cursor CSS property styles the pointer, allowing you to provide hints to the user on how to interact with the hovered element.

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 EyeDropper API opens an eyedropper tool, a color picker that allows users to select a color from their screen.

The protocol_handlers web app manifest member registers an installed web app as a handler for a specific protocol. When a user follows a link with the specified protocol, the installed app opens the link.

The image-rendering: smooth CSS declaration scales images while retaining a gradual color blending that is useful for photos.

The Profiler API records data about the execution of a page, which you can send to a server for later analysis. Also known as self-profiling.

The navigator.virtualKeyboard API inspects and controls on-screen virtual keyboards. You can use it to programmatically hide or show a virtual keyboard or respond to the keyboard disappearing or appearing.

The navigator.ink API uses the system compositor to draw to a <canvas> element ahead of pointer events, reducing the delay between moving a stylus or cursor and a pen stroke appearing on screen.

The name="theme-color" attribute for the <meta> HTML element suggests a color that the browser can use to customize the display of the page or the browser user interface.

The optional desynchronized parameter of a canvas's getContext() method permits the browser to draw a 2D canvas independently of the event loop. This can reduce drawing latency.

The EXT_frag_depth extension for WebGL 1.0 and 2.0 contexts adds setting the depth value of a fragment from within the fragment shader.

The navigator.mediaSession API integrates with platform UI for media playback. It can be used to set metadata such as title and artwork, and to handle user actions like playing, pausing, or seeking.

The WEBGL_draw_buffers extension for WebGL 1.0 contexts enables a fragment shader to write to several textures, which is useful for deferred shading, for example.

The WEBGL_multi_draw extension for WebGL 1.0 and 2.0 contexts renders more than one primitive with a single function call.

The OVR_multiview2 extension for WebGL 2.0 contexts renders into multiple views simultaneously. This especially useful for virtual reality (VR) and WebXR.

The Sec-Fetch-Dest, Sec-Fetch-Mode, Sec-Fetch-Site, and Sec-Fetch-User HTTP headers provide extra information about the way a request was made, to help servers reject certain kinds of malicious requests.

The ascent-override, descent-override, and line-gap-override descriptors adjust the display of a font declared in an @font-face statement. This can help make fallback fonts look the same size.

The Accelerometer, LinearAccelerationSensor and GravitySensor APIs read the acceleration applied to a device in three dimensions, either including the effect of gravity, without its effect, or only its effect, respectively.