Not too hard to set up a site template, and then integrate ckEditor to allow them to edit the sections they need to update while protecting the underlying structure from accidents.
You may not agree, but Robert is correct. Even the W3 work group charged with its creation lists it as a "Draft" specification which means that it will change, parts of it may be removed and other...
PHP is certainly one avenue to explore, but given your background you may want to bite the smaller bullet and go to ASP.Net with the VB option. There will some minor recoding required depending on...
Could use AJAX to call a PHP script on the server, but otherwise the order of execution is always server based code (PHP, etc), and then HTML and client based code (javascript, etc.)
They're doing it with a little bit of javascript. Didn't bother tracking down how they're doing it, but standard practice is to capture the onkeydown (or similar) event and then process it.
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