A little help with a CSS selector?

[Arkshine]

From what I see in the code, you can expect to see the following classnames:

• is-staff
• is-admin
• is-moderator
• is-new-user
• group--primary_group_name

You could create a group and set it as the primary group.

You can also use some code to add the missing class names.

import { apiInitializer } from "discourse/lib/api";

export default apiInitializer((api) => { 
  // Add the groups you wants to add
  const allowedGroups = ["trust_level_4"];

  api.modifyClass("components:chat/message/info", () => {
    return class extends SuperClass {
      @service currentUser;
      
      get usernameClasses() {
        if (!this.currentUser) {
          return super.usernameClasses;
        }
        const allowedGroupClasses = this.currentUser.groups
          .filter((g) => allowedGroups.includes(g.name))
          .map((g) => `group--${g.name}`)
          .join(" ");
      
        return super.usernameClasses + " " + allowedGroupClasses;
      }
    }
  })
});

Then you can CSS target with .group--trust_level_4.

Example:

.chat-message-info__username.group--trust_level_4 {
    .chat-message-info__username__name {
        color: blue;
    }
}

For username, you don’t need the code above:

.chat-message-info__username.[data-user-card="username_here"]  {
    .chat-message-info__username__name {
        color: red;
    }
}