Baseline Widely available
The MediaTrackConstraints dictionary's height property is a ConstrainULong describing the requested or mandatory constraints placed upon the value of the height constrainable property.
If needed, you can determine whether or not this constraint is supported by checking the value of MediaTrackSupportedConstraints.height as returned by a call to MediaDevices.getSupportedConstraints(). However, typically this is unnecessary since browsers will ignore any constraints they're unfamiliar with.
If this value is a number, the user agent will attempt to obtain media whose height is as close as possible to this number given the capabilities of the hardware and the other constraints specified. Otherwise, the value of this ConstrainULong will guide the user agent in its efforts to provide an exact match to the required height (if exact is specified or both min and max are provided and have the same value) or to a best-possible value.
See the Constraint exerciser example.
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