The OffscreenCanvas interface provides a canvas that can be rendered off screen. It is available in both the window and worker contexts.

API Canvas Experimental Interface Reference

Page transition events fire when a webpage is being loaded or unloaded.

API Interface NeedsMarkupWork Reference Référence

The PerformanceEntry object encapsulates a single performance metric that is part of the performance timeline. A performance entry can be directly created by making a performance mark or measure (for example by calling the mark() method) at an explicit point in an application. Performance entries are also created in indirect ways such as loading a resource (such as an image).

API Interface Reference Web Performance

The PerformanceFrameTiming interface provides frame timing data about the browser's event loop. A frame represents the amount of work a browser does in one event loop such as processing DOM events, resizing, scrolling, rendering, CSS animations, etc. A frame rate of 60fps (frames per second) for a 60Hz refresh rate is the target for a good responsive user experience. This means the browser should process a frame in about 16.7ms.

API Interface Reference Web Performance

PerformanceMark is an abstract interface for performance entries with an entry type of "mark". Entries of this type are created by calling performance.mark() to add a named DOMHighResTimeStamp (the mark) to the browser's performance timeline.

API Interface Reference Web Performance

PerformanceMeasure is an abstract interface for performance entries with an entry type of "measure". Entries of this type are created by calling performance.measure() to add a named DOMHighResTimeStamp (the measure) between two marks to the browser's performance timeline.

API Interface Reference Web Performance

The PerformanceNavigationTiming interface provides methods and properties to store and retrieve high resolution timestamps or metrics regarding the browser's document navigation events. For example, this interface can be used to determine how much time it takes to load or unload a document.

API Interface Reference Web Performance

The PerformanceObserver interface is used to observe performance measurement events and be notified of new performance entries as they are recorded in the browser's performance timeline.

API Interface Reference Web Performance

The PerformanceObserverEntryList interface is a list of peformance events that were explicitly observed via the observe() method.

API Interface Reference Web Performance

The PerformanceResourceTiming interface enables retrieving and analyzing detailed network timing data regarding the loading of an application's resources. An application can use the timing metrics to determine, for example, the length of time it takes to fetch a specific resource, such as an XMLHttpRequest, <SVG>, image, or script.

DOM Interface Reference Web Performance

The PositionOptions interface describes an object containing option properties to pass as a parameter of Geolocation.getCurrentPosition() and Geolocation.watchPosition().

API Geolocation API Interface Reference

The RadioNodeList interface represents a collection of elements in a <form> or a <fieldset> element.

API HTML DOM Interface RadioNodeList

API Fetch Interface ReadableByteStream Reference

API Experimental Interface RTCConfiguration WebRTC

API Interface Reference Référence WebRTC

Calling the Selection.toString() method returns the text contained in the selection, e.g.:

API Experimental Interface Reference Selection

The UIEvent interface represents simple user interface events.

API DOM Event Interface Reference

The WebContextEvent interface is part of the WebGL API and is an interface for an event that is generated in response to a status change to the WebGL rendering context.

API Interface Reference WebGL WebGLContextEvent

The WebGLTransformFeedback interface is part of the WebGL 2 API and enables transform feedback, which is the process of capturing primitives generated by vertex processing. It allows to preserve the post-transform rendering state of an object and resubmit this data multiple times.

API Interface Reference WebGL WebGL2

CSS User Interface is a CSS module that allows to define the rendering and functionality of user interface related features.

CSS CSS Basic User Interface Overview Reference