Please note that the HTML tag simply embeds HTML code into the page - it is not intended to insert complete HTML documents - this will actually result in invalid HTML code (you then have multiple HEAD, DOCTYPE, BODY tags in the page which is not allowed in HTML) - only parts between the opening and closing BODY tag can be used, i.e. HTML code/elements, not documents.
Instead you can get it working by following best practises here:
1. You already have a complete HTML document you want to embed
2. Simply embed it using the iFrame widget:
a) In the closed and unpacked project directory add the "New.html" to the main directory, i.e. the same one that webiq.json, index.html etc. are in
b) Load this modified project and delete the HTML widget in the HMI
c) Add an iFrame element and set the URL to "New.html" (excluding the quotation marks)
Then it will work. Why it didn't work I don't know but when working with web technology and especially JavaScript you should familiarize yourself with JavaScript debugging.
