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SharedArrayBuffer

The SharedArrayBuffer object is used to represent a generic, fixed-length raw binary data buffer, similar to the ArrayBuffer object, but in a way that they can be used to create views on shared memory. Unlike an ArrayBuffer, a SharedArrayBuffer cannot become detached.
Constructor Experimental JavaScript Shared Memory SharedArrayBuffer TypedArrays

Uint16Array

The Uint16Array typed array represents an array of 16-bit unsigned integers in the platform byte order. If control over byte order is needed, use DataView instead. The contents are initialized to 0. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).
Constructor JavaScript TypedArray TypedArrays Uint16Array

Uint8Array

The Uint8Array typed array represents an array of 8-bit unsigned integers. The contents are initialized to 0. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).
Constructor JavaScript TypedArray TypedArrays Uint8Array

Uint8ClampedArray

The Uint8ClampedArray typed array represents an array of 8-bit unsigned integers clamped to 0-255; if you specified a value that is out of the range of [0,255], 0 or 255 will be set instead. The contents are initialized to 0. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).
Constructor JavaScript TypedArray TypedArrays Uint8ClampedArray

Blob()

The Blob() constructor returns a new Blob object. The content of the blob consists of the concatenation of the values given in the parameter array.
API Blob Constructor Experimental Expérimental File API Reference Référence

Option()

Constructor for creating an HTMLOptionElement. The Option constructor is from the very early days of DOM scripting and has non–standard syntax, but has ubiquitous support in browsers.
API Constructor HTML DOM HTMLOptionElement NeedsBrowserCompatibility NeedsContent NeedsExample NeedsMarkupWork NeedsSpecTable

Path2D()

The Path2D() constructor returns a newly instantiated Path2D object, optionally with another path as an argument (creates a copy), or optionally with a string consisting of SVG path data.
API Canvas Constructor Drawing Graphics Path2D Paths Reference Référence

PromiseRejectionEvent()

The PromiseRejectionEvent() constructor returns a newly created PromiseRejectionEvent, which represents events fired when a JavaScript Promise is rejected.
API Constructor events Events HTML DOM JavaScript PromiseRejectionEvent Promises Reference