Non-standard: This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
msPlayToPrimary is a read/write property which gets or sets the primary DLNA PlayTo device.
This proprietary property is specific to Internet Explorer and Microsoft Edge.
ptr = object.msPlayToPrimary;
Boolean value set to true indicates that the device is the primary DLNA PlayTo device, otherwise false.
// Microsoft extensions
interface HTMLImageElement : HTMLElement
{
attribute boolean msPlayToDisabled;
attribute boolean msPlayToPrimary;
attribute DOMString msPlayToPreferredSourceUri;
};
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https://developer.mozilla.org/en-US/docs/Web/API/MsPlayToPrimary