html5 doesn't support accordion tag [duplicate]

Question

This question already has answers here:

Resolving “Validation (): Element ‘xxxx’ is not supported” warning in Visual Studio 2005/2008 (2 answers)

Closed 5 years ago.

I am trying to use the accordion tag from angularjs bootstrap, however, in the IDE it says that Validation (HTML5): Element accordion is not supported. I've been searching around for the issue, but it seems like not many people encounter this issue.

Answer 1

the accordion tag is not HTML5 its a custom element thus your IDE is not going to validate it.

more info on custom elements/tags