On Tuesday, 27 April 2021 at 16:37:35 UTC+10 Albert Krewinkel wrote:

Tim <tim.a...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:

> I think this almost does the trick, but the colon is appearing at the end
> of the heading:
>
> 1 FirstHeading.
>
> whereas I wanted it just after the number 1.
>
> Is there a way to change it ?

Whoops, I misread your question. This should do:

``` {=html}
<style>
.header-section-number::after {
content: '.';
}
</style>
```

--
Albert Krewinkel
GPG: 8eed e3e2 e8c5 6f18 81fe e836 388d c0b2 1f63 1124