Super/Duper/Long/NonBreaking/Path/Name/To/A/File/That/Is/Way/Deep/Down/In/Some/Mysterious/Remote/Desolate/Part/Of/The/Operating/System/To/A/File/That/Just/So/Happens/To/Be/Strangely/Named/Supercalifragilisticexpialidocious.txt A few things to check for: Non-breaking text in the title, content, and comments should have no adverse effects on layout or functionality. Check the browser window / tab title. If you are a plugin or widget developer, check that this text does not break anything. The following CSS properties will help you support non-breaking text. -ms-word-wrap: break-word; word-wrap: …

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 cause issues with JavaScript when it is minified, especially in the admin when editing the post itself (ie. issues with metaboxes, media upload, etc.).