how to add support for ionic and custom tags in HTML file

Hello, where i can start reading how to add support for extra HTML tags when editing an HTML template?

For instance i wish to check and validate custom tags and attributes for Ionic like:
<ion-content>
<ion-view>
<my-custom-attribute>

Actually i can do this manually from the editor using a custom plugin just to hide the tips about it.

Instead i wish to create a plugin that implements the correct syntax.

From where i can start?

Thanks.