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.

An AudioListener object represents the virtual position and orientation of a person relative to sound sources, to spatialize audio in a Web Audio context.

The EXT_float_blend extension for WebGL 1.0 and 2.0 contexts adds 32-bit floating-point components to blending and draw buffers.

The Request.formData() and Response.formData() methods read a request or response body and return a FormData promise. You can use it to access the fields of a form submission.

The KHR_parallel_shader_compile extension for WebGL 1.0 and 2.0 contexts checks the status of shader compilation without blocking the runtime.

The window.performance.timing and window.performance.navigation APIs report performance timing information for events that occur during the loading and use of the current page.

The WEBGL_compressed_texture_s3tc_srgb extension for WebGL 1.0 and 2.0 contexts adds S3TC compressed texture formats for the sRGB colorspace to compressedTexImage2D() and compressedTexSubImage2D().

The WebVTT cue alignment settings control which part of the cue is aligned with the given line and position. Cue alignment is set using line and position settings in WebVTT files or the lineAlign and positionAlign properties of VTTCue using JavaScript.

WebVTT regions set the areas of the video where captions or subtitles should be rendered, such as placing roll-up captions used for live captions.

The display: ruby CSS declaration renders an element with the box layout of a <ruby> HTML element. Child elements may use equivalents to <ruby> internal elements such as display: ruby-base for <rb>.

An XRDepthInformation object represents a measurement of the distance from the user's device to the real-world geometry in the user's environment.

The XRLightProbe and XRLightEstimate objects represent real-world environmental lighting conditions during a WebXR session.

The Sec-CH-UA HTTP request header and the navigator.userAgentData API expose browser and platform information used to vary responses and application logic. User agent client hints are similar to user agent strings but more privacy-preserving and safer to parse.

The measureUserAgentSpecificMemory() method estimates the memory usage of a web application including all its iframes and workers.

The share_target web app manifest member registers an installed web app as a handler for shared content. When a user shares content by using the device share dialog, the installed app can be listed as an option for handling the shared content.

The WebHID API provides access to Human Interface Devices (HID) that are connected to the user's device.

The cookieStore.get() method returns cookie metadata, such as the domain, expires, path, sameSite and secure properties.

The navigator.scheduling.isInputPending() method checks if there are pending input events, such as touch or mouse events. This allows you to yield from long-running scripts that might be blocking user interaction.

The ::marker CSS pseudo-element selects list item markers for styling numbers or bullets.

The "immersive-ar" value for navigator.xr.requestSession() starts an augmented reality WebXR session that renders content aligned with the visible environment.