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Window: length property

files/en-us/web/api/window/length/index.md

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{{APIRef}}

Returns the number of frames (either {{HTMLElement("frame")}} or {{HTMLElement("iframe")}} elements) in the window.

Value

A number.

Examples

js
if (window.length) {
  // this is a document with subframes
}

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}