The discussion revolves around the idea of adding CSS classes to posts based on a user’s group membership, allowing for styling elements like backgrounds or text based on group affiliation. riking proposes a solution where classes like group-trust-level-2 or group-bb-writers could be applied to posts, enabling custom styling via CSS. codinghorror questions the purpose and requests a visual mockup, which riking provides with an example showing a styled post background for a specific group. rafalp suggests a live site example, while codinghorror notes that similar functionality already exists in two forms. riking then asks if such styling is actually possible via CSS selectors, indicating some uncertainty about implementation.
I think it would be pretty cool if we could get some CSS classes on posts based on what groups a user belongs to.
So, for example:
<article class="boxed group-trust-level-2 group-bb-writers" ......>
With a checkbox for whether or not the group shows up in the styling, in case we want private groups for some reason.
It would already be possible to do crazy CSS stuff with matching on article[data-user-id=6626], but that would be very annoying to do for every user in the group.
For what purpose? Can you provide a visual mockup? Not clear what this would do, or be for.
Say, something like this:
Which would be given with
article.group-bb-writers div.topic-body {
background-color: rgb(202, 233, 207);
}
The existing per-user customization, the highlighted name and title, might not be enough for some people: Reddit - Please wait for verification
(that subreddit is a little bit, ah, crazy with its CSS customizations…)
div.usertext-body div.md *:first-child::first-letter {
text-transform: lowercase;
text-decoration: underline;
}
How about live site example, if I may? 
Blizzard uses extra styling to visually differ their employees posts and MVP’s from user ones:
Right, we already have that in two forms – look at my post, and look at close / open / archive messages.
