rel="0" in element docs

[ebidel]

The example uses rel="0" but I can't find this param in the element. Is it leftover?

 <google-youtube
      videoid="..."
      height="270px"
      width="480px"
      rel="0"
      start="5"
      autoplay="1">
    </google-youtube>```

[jeffposnick]

There is an amorphous set of supported player parameters for the standard YouTube embed, including rel: https://developers.google.com/youtube/player_parameters#rel

I took the approach of just passing through attributes set on <google-youtube> to the underlying YouTube embed, to give developers flexibility in setting what they want. That means that I'm relying on folks to look at the YouTube embed docs page to figure out what they want to set (though not all parameters are documented there...), with the chromeless attribute serving as a shortcut for the most common combination of settings.

It makes sense to me, but I can see why it would be confusing to the average developer not steeped in YouTube API history. I'll keep this open as a reminder that it would be better to at least at <google-youtube> documentation for the most stable player parameters.