Putting special characters in the title should have no adverse effect on the layout or functionality. Special characters in the post title have been known to Read more Markup: Title With Special Characters
Verify that: The post title renders the word "with" in italics and the word "markup" in bold. The post title markup should be removed from Read more Markup: Title With Markup
Title should not overflow the content area A few things to check for: Non-breaking text in the title, content, and comments should have no adverse effects on Read more Antidisestablishmentarianism
This post has no title, but it still must link to the single post view somehow. This is typically done by placing the permalink on the Read more
This post has many tags. Read more Edge Case: Many Tags