enh-b-a allows us to subclass an existing custom element, unchanged, and just give it a more meaningful name, based on the context in which it is used. This allows us to make our HTML markup more semantic.
For example, suppose we have a generically named web component, like "time-ticker".
We wish to use that web component, but give it a more meaningful name. We can do that thusly:
<message-rotator enh-be-a=time-ticker></message-rotator>Only one such instance needs to be so adorned with the attribute -- subsequent instances will work throughout the (scoped) document without needing to add the registering hint. But no harm done if it is added anyway.