When updating our website from XHTML to HTML5, will changing the following things result in rendering problems for our site in older browsers like Internet Explorer 8:
<!doctype html>. (The current XHTML web pages are well-formed enough)
Add new specific HTML5 semantic block tags like
<article>. We are not going to use CSS for these tags - just wrap the existing parts of the site.
Add microdata attributes to the existing tags like
After reading some books and many Internet articles, I see no problems as the new tags and attributes will be simply excluded from rendering as unknown in those older browsers. However, I admit, in practice there can be some issues, especially with IE. Does anybody have any real experience with that?