Is HTML5 backwards compatible with XHTML?

Question

Short question: Can I change the DOCTYPE of my existing XHTML 1.0 website to HTML5? Will this cause any problems?

Long story:

Answer 1

HTML5 was designed to be backwards compatible with both HTML 4.01 and XHTML 1.0/1.1, so that previous (X)HTML pages could be migrated to HTML5 easier. Of course, they wouldn't be taking advantage of new HTML5 features (such as new tags), but they would still be technically valid HTML5.