A nice demo article
Usually, there is a small intro. The table of contents comes next.
How was this created?
This way: <table-of-contents></table-of-contents>
As you can see, the default works, but might be not what you want for more complex pages
This h4 is an important announcement
We want this headline in the TOC for testing purposes to see that headlines do not need to be ordered from h1-h4, but can come in unexpected ways.
This h4 is for a sponsored message
This should be excluded from the TOC generator I suppose