Testing YouTube embeds

Above I’ve used the default Gutenberg YouTube embed with this url: 

https://www.youtube.com/embed/Bw9zSMsKcwk?autoplay=1&cc_load_policy=1&cc_lang_pref=sq

Below I’ve used an HTML block with an iframe constructed around that same url. If you click the settings (gear) icon, you’ll see that the closed captioning language has been preset to Albanian language code “sq”.

<iframe id="ytplayer" type="text/html" src="https://www.youtube.com/embed/Bw9zSMsKcwk?autoplay=1&amp;origin=http://example.com&amp;autoplay=1&amp;cc_load_policy=1&amp;cc_lang_pref=sq" width="640" height="360" frameborder="0"></iframe>