Panels are a div of class ux-panl that have two parts: a header (ux-panl-header) and content (ux-panl-content). Headers should always have a h2 or h3 to serve as their title.
For collapsible panels you should apply the ux-panl-open and ux-panl-closed classes in addition to (and immediately following) the ux-panl class. These are shown above, but for situations where the panels do not collapse you should only use the ux-panl class.
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