According to this tutorial we need to set the tsconfig.json compiler option allowJs to true and include CUSTOM_ELEMENTS_SCHEMA and I've done these two things as shown in this Stackblitz:
https://stackblitz.com/edit/angular-web-component-stripping
I also created a minimal reproduction using the latest Angular version here:
https://github.com/fireflysemantics/scully-custom-element-test
In the Stackblitz demo the innerHTML of the hello component is set to:
<h1> Web Component Test</h1>
<fs-image url="https://fireflysemantics.github.io/i/developer/instant-html-vscode.png"></fs-image>
However Angular strips the fs-image web component. What do we need to do to include it?
Angular does log this warning:
WARNING: sanitizing HTML stripped some content, see https://g.co/ng/security#xss
