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It's actually class="terraria sortable". Classes are preset CSS styles. On the wiki they're set from MediaWiki:Common.css. You can set custom styles for a table via style="border-color:red" for example.
As Ferretwings says, many HTML tags do work on the wiki (like div and br). Some don't, like <a></a> (links), which the wiki forces you to enter via wiki code. Most things however should be done via wiki code, when possible, just so it continues to be relatively easy for non-programmers to edit pages, and for uniformity.