1. I'm assuming that you have some local static HTML/CSS page. First off, you don't need to render the generated HTML by the javascript in an iframe, almost any …
There are js actions triggered when widgets are added or saved. Reasonably called widget-added and widget-updated. Trac ticket: https://core.trac.wordpress.org/ticket/19675. …
Widget Instance module. This will allow you to render the JS application anywhere you can use a content entity (rendered as an entity reference, as a block, ...). Widget Ingestion …
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