[Question] How does the double colon ("::") works on the content property on a html component?

[JGGurgel]

Why is the content before the double colon not visible/rendered?

I could not find the answer in the source code.

any help is appreciated!!

[JGGurgel]

Is there anyway to scape this special case?

I need it to render all the content.

Thanks!!

[JGGurgel]

just for reference, i used this online form builder:

https://formio.github.io/angular-demo/#/forms/builder