When playing HTML5 Video in Chrome for Android (via <video>
-Tag) while having an active Chromecast dongle in the local network it displays the "Cast" icon in the upper left corner of the video. In the desktop version of chrome this does not seem to be possible. There is only the option to cast the whole tab which means that a live capture of the tab will be locally streamed to the Chromecast. Although this also results in the video and audio being played on the Chromecast it means that your computers screen will be captured, reencoded and then be transmitted to the Chromecast whereas Chrome for Android instructs the Chromecast to play the original Video source directly from the Internet (like all the other Chromecast Apps like YouTube, Netflix, etc.).
Why ist this feature not available in Chrome Desktop while it is generally possible to talk to Chromecast in this "native" way judging by YouTube's or Netflix' sites which offer their "Cast" feature also in Chrome Desktop?