2.1.364 Part 1 Section 16.11, style:footer
a. The standard defines the element <style:footer>
-
This element is not supported in PowerPoint 2013, PowerPoint 2016, PowerPoint 2019.
b. The Open Document Format for Office Applications (OpenDocument) Version 1.3. Part 3: OpenDocument Schema defines the element <style:footer-first>
-
The element <style:footer-first> is supported in Microsoft Word 2021 and later. This element will be unrecognized in earlier versions and its content will manifest as content in the main body of the document.