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* Illustrates methods for testing for the existence of support
* for setting a speaker device.
// Check for the setSinkId() method on HTMLMediaElement.
if (setSinkId in HTMLMediaElement.prototype) {
// Do the work.
// ...or...
// Check for the sinkId property on an HTMLMediaElement instance.
if (typeof element.sinkId !== 'undefined') {
// Do the work.

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fippo commented Sep 4, 2018

if ('setSinkId' in HTMLMediaElement.prototype) (missing quotes) is the better check in terms of semantics as it checks for general support)

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