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TreeWalker.previousSibling()

The TreeWalker.previousSibling() method moves the current Node to its previous sibling, if any, and returns the found sibling. I there is no such node, return null and the current node is not changed.
API createTreeWalker DOM DOM Reference Method TreeWalker treeWalker.previousSibling

USVString

USVString corresponds to the set of all possible sequences of unicode scalar values. USVString maps to a String when returned in JavaScript; it's generally only used for APIs that perform text processing and need a string of unicode scalar values to operate on.
API DOM DOM Reference Reference Référence String WebIDL

cancelIdleCallback

The Window.cancelIdleCallback() enables you to cancel a callback previously scheduled with Window.requestIdleCallback.
API DOM DOM Reference JavaScript timers Method Reference

Window.frameElement

Returns the element (such as <iframe> or <object>) in which the window is embedded, or null if the element is either top-level or is embedded into a document with a different script origin; that is, in cross-origin situations.
API DOM DOM Reference Gecko Property Reference Window

Window.frames

Returns the window itself, which is an array-like object, listing the direct sub-frames of the current window.
API DOM DOM Reference Gecko NeedsContent NeedsUpdate Property Reference Référence

Window.getAttention()

Attempts to get the user's attention. How this happens varies based on OS and window manager.
API DOM DOM Reference Gecko Method Reference Référence

Window.length

Returns the number of frames (either <frame> or <iframe> elements) in the window.
API DOM DOM Reference Gecko Property Reference Window

requestIdleCallback

The window.requestIdleCallback() method queues a function to be called during a browser's idle periods. This enables developers to perform background and low priority work on the main event loop, without impacting latency-critical events such as animation and input response. Functions are generally called in first-in-first-out order unless the function's timeout is reached before the browser calls it.
API DOM DOM Reference JavaScript timers Method Reference

CameraCapabilities.flashModes

The flashModes property is an Array of strings identifying each of the flash modes supported by the camera. Possible values are auto, off, on or torch.
API B2G Camera camera DOM DOM Reference Firefox OS Graphics JavaScript Property Reference Référence WebAPI