The Book of Forgotten Styles: a small list of WordPress generated classes that we tend to shamefully ignore
.more-link: The Continue reading link.post-edit-link
- Pagination links
 
.wp-caption-text
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Pagination links
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.logged-in-as - 
.must-log-in: When the user has to login in to comment - 
.reply: The wrapper<div>.comment-reply-link: The reply link.comment-reply-login: When the user has to login in to comment
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.comment-notes#email-notes
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.form-allowed-tags: The allowed HTML tags that appear right before the Submit button. Usescomment_form() 
.bypostauthor: A comment by the post author.byuser: A comment by a logged user.comment-author-admin: A comment by one of the logged admins
.gallery/* The Gallery container (div) */.gallery .gallery-item/* A Gallery item container, for 3, 2 and 4 column galleries */.gallery-columns-2 .gallery-item.gallery-columns-4 .gallery-item.gallery img/* The actual image inside a container for 3, 2 and 4 column galleries */.gallery-columns-2 .attachment-medium.gallery-columns-4 .attachment-thumbnail.gallery .gallery-caption/* A gallery image caption */.gallery dl, .gallery dt/* Definition lists elements */.gallery br+br/* Pick the second line break if two line breaks are adjacent */