@Sean said in First module I'm developing, HTML won't render: @s1h4d0w iframe.setAttribute("src", this.config.url); Anyway, your url "https://open.spotify.com" will not be opened. Ah thank you! At least now I know what I was doing wrong, will be tinkering some more. Seems like I need to include /embed/ in the spotify url to get it to be accessible. And thank you @sdetweil, also a handy tip!