What is the best approach to converting a SP 2010 master page into a SP 2013 master page? After performing an upgrade from SP 2010 to 2013, our public facing website lost its style and structure. Also when I attempt to browse to the website after setting the master page to the old 2010 master page, the page breaks or fails to load. After researching it came to me that the master page structure may have controls that are either deprecated or changed. Do i need to start from scratch to create this new site meaning fresh html? If so how i port of over web parts and special controls from old master page?
Very curious to see what other have experienced about with this issue.