HTMLMediaElement: duration property

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


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.


const obj = document.createElement("video");
console.log(obj.duration); // NaN


HTML Standard
# dom-media-duration-dev

Browser compatibility

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See also