After a re-design of some pages in our site, we have the new re-designed pages with doctype HTML5 and all the rest pages (that are not yet redesigned) with doctype XHTML 1.0 Transitional.
Does that create any problem? (SEO or otherwise)?
There is a similar question (Is it bad to have a mix of HTML 5 and XHTML pages within one website from SEO perspective?) but it only touches the SEO subject. I am wondering if any other kind of issue can arise from this situation.