Use a https URL within the embedding iframe. Otherwise, modern browsers issue mixed content warnings, when esoTalk itself runs over TLS.
Change the regex to extract any additional options and pass them along to the iframe URL. This allows to embed YouTube playlist URLs, which contain a list= argument in addition to the video ID.
https
URL within the embedding iframe. Otherwise, modern browsers issue mixed content warnings, when esoTalk itself runs over TLS.list=
argument in addition to the video ID.