HTML Lab.js not working?

Hi all,

currently trying to use the HTLM code that Lab.js have on their page to allow me to use my experiment on there to here but it keeps telling me it can't save, and there's an error. The error is: "Error: Question Q1 has not been saved. You are only allowed to use a subset of HTML markup tags." Also the next step is to use java code but that option isn't even available on the cog (assuming it is due to the HTLM not working as well?) the experiment is showing as the tutorial (and uni guide) have both shown but as said above won't save or give me the option for java. I'm using netlify as the free hosting for the lab.js data as a side note.

any help would be much appreciated.

link to lab.js tutorial i'm using:https://labjs.readthedocs.io/en/latest/learn/deploy/3a-qualtrics.html

code as it appears in my survey:
however on the html view it is all plain black text

src="https://"goofy-shirley-26671c.netlify.app
style="width: 100%; min-height: 600px; border: none;"
allowfullscreen
>