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Here, the edit page banner is being set. div#a h1.edit is an example of a CSS selector. Diva D2W page content is nested inside a <div id="a">..</div>. ItSee: Layout of a Diva Look Page. Therefore it's CSS selector is div#a. The page title is marked up as <h1 class="edit">..</h1>, so the resulting CSS selector for that element would be h1.edit or more specifically div#a h1.edit.

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