Window: length property
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The length read-only property of the Window interface returns the number of frames (either <frame> or <iframe> elements) in the window.
Value
A number.
Examples
js
if (window.length) {
// this is a document with subframes
}
Specifications
| Specification |
|---|
| HTML # dom-length-dev |