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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement/duration below:

HTMLMediaElement: duration property - Web APIs

HTMLMediaElement: duration property

Baseline Widely available

The read-only HTMLMediaElement property duration indicates the length of the element's media in seconds.

Value

A double-precision floating-point value indicating the duration of the media in seconds. If no media data is available, the value NaN is returned. If the element's media doesn't have a known duration—such as for live media streams—the value of duration is Infinity.

Examples
const obj = document.createElement("video");
console.log(obj.duration); // NaN
Specifications Browser compatibility See also

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