Feature request: custom admonition styling

[kescobo]

The problem

Prior to 0.24 (I think), it was possible to add custom admonition styling. Eg, I could make docs/assets/admonitions.css containing

.admonition.practice > .admonition-title {
 background-color: rgba(152,78,163,0.8);
}

.admonition.practice {
 background-color: rgba(152,78,163,0.3);
}

and

format=Documenter.HTML(; # ...
    assets=String["assets/admonitions.css"])

inside makedocs(), to get purple admonitions when using !!! practice. This doesn't seem to work anymore, since the admonition name doesn't seem to get passed into the html for non-defaults. Eg Example1:

!!! practice "test"
    This is a test

gets turned into

<div class="admonition"><header class="admonition-header">test</header><div class="admonition-body"><p>This is a test</p></div></div>

Whereas Example2:

!!! compat "test"
    This is a test

gets turned into

<div class="admonition is-compat"><header class="admonition-header">test</header><div class="admonition-body"><p>This is a test</p></div></div>

---

Proposal

Add the admonition type to the class, so that example 1 above would get turned into

<div class="admonition is-practice"><header class="admonition-header">test</header><div class="admonition-body"><p>This is a test</p></div></div>

Then, if I understand correctly, I could change my admonitions.css to

.admonition.is-practice > .admonition-header {
 background-color: rgba(152,78,163,0.8);
}

.admonition.is-practice > .admonition-body {
 background-color: rgba(152,78,163,0.3);
}