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.).
Enea Overclokk
I'm a freelance WordPress lovers and developer with the passion of the web performance optimization and clean code.
I started with WordPress in 2007 and from 2013 I release the ItalyStrap theme, at the beginning it was only a starter theme but now is a full theme framework and GPLv2 compatible.
I'm also a developer of Italy Cookie Choices a plugin for the EU Cookie Law
I'm the organizer of the WordPress Meetup in Bologna and the organizer of the WordCamp Bologna.
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