The W3C page on why you should do this: https://www.w3.org/TR/WCAG20-TECHS/G140
The The Universal Usability page: https://universalusability.com/access_by_design/document_structure/separate.html
Wikipedia has an article at: https://en.wikipedia.org/wiki/Separation_of_presentation_and_content
CSS Zen Garden shows how the look of a page can change with the same content : https://www.csszengarden.com/
Ohio LinuxFest is September 28-30 in Columbus, Ohio. Go to https://ohiolinux.org/ for more information.
My web site is at https://www.ahuka.com/.
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Unless otherwise stated, our shows are released under a Creative Commons Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0) license.
The HPR Website Design is released to the Public Domain.