MediaTrackSupportedConstraints: width property

The MediaTrackSupportedConstraints dictionary's width property is a read-only Boolean value which is present (and set to true) in the object returned by MediaDevices.getSupportedConstraints() if and only if the user agent supports the width constraint. If the constraint isn't supported, it's not included in the list, so this value will never be false.

You can access the supported constraints dictionary by calling navigator.mediaDevices.getSupportedConstraints().


widthConstraintSupported = supportedConstraintsDictionary.width


This property is present in the dictionary (and its value is always true) if the user agent supports the width constraint. If the property isn't present, this property is missing from the supported constraints dictionary, and you'll get undefined if you try to look at its value.


const result = document.getElementById("result");
const supported = navigator.mediaDevices.getSupportedConstraints().width;
result.textContent = supported ? "Supported!" : "Not supported!";



Media Capture and Streams
# dom-mediatracksupportedconstraints-width

Browser compatibility

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See also