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RE: Vanilla Js App inside Liferay
Is there any chance to make simple application with one html and one JS file inside Liferay?
That depends on your usecase.
An easy approach could be to use a reverse proxy that maps the html page to a url. Other options, if you want to e.g. keep the Liferay header and footer, include embedding an Iframe or to put the html and js in a fragment.