Auto-select single Chromecast device?
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auto-select the Chromecast device when a single device is detected, and then persistence once a Chromecast device is selected until and unless a second or multiple device are detected.
As well, for homes with multiple Chromecast devices present, a countdown timer to allow users to change the playback device selection from a persistent 'last device used', followed by auto-selection of the last device used from that browser if no change in device is selected, would likely be applicable the vast majority of the time.