Baseline Widely available
The byteOffset accessor property of DataView instances returns the offset (in bytes) of this view from the start of its ArrayBuffer or SharedArrayBuffer.
// Create an ArrayBuffer with a size in bytes
const buffer = new ArrayBuffer(16);
const view = new DataView(buffer, 12, 4); // From byte 12 for the next 4 bytes
console.log(view.byteOffset);
// Expected output: 12
The byteOffset property is an accessor property whose set accessor function is undefined, meaning that you can only read this property. The value is established when an DataView is constructed and cannot be changed.
const buffer = new ArrayBuffer(8);
const dataview = new DataView(buffer);
dataview.byteOffset; // 0 (no offset specified)
const dataview2 = new DataView(buffer, 3);
dataview2.byteOffset; // 3 (as specified when constructing the DataView)
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