Tex: Thanks for the clarification. I have noticed that the Kindle Guidelines and the website are indeed badly written. Which, as you noted, just creates needless confusion, particularly around us non-coders.
Another point to this issue: Amazon still promote the idea that Kindle books can only read Latin-1 (ISO-8859-1) characters. Yet after I learned here about using Unicode to create the musical symbol, I began experimenting more. I randomly chose 10 Unicode characters and tested them in both Previewer and my Kindle Fire device. In Previewer all the characters display correctly except for the older Kindle DX, which could only display 3 of the 10 characters. My Fire displays all fine.
So why would Amazon not want to promote the use of Unicode, seeing as it solves a number of issues? If they promote KF8 formatting, which the DX also cannot read, why not promote Unicode too?
Last question (she says): when exporting to HTML from Word, should we now select UTF-8 encoding or leave it as the default Windows-1252, before importing into Sigil? And does it make a difference if PC or Mac?
I ask because on the KDP website is written: "If you are experiencing conversion failures when trying to upload HTML content, please open the HTML file in Notepad and save it with "Encoding: ANSI" (this is an option in the 'Save As' Notepad dialog). On non-Windows platforms, make sure to save it as ANSI or ASCII, avoiding 'UTF-8' or 'Unicode' as the encoding type."
I'm wondering if that is restricted to Mac and/or restricted to the auto-conversion from HTML to mobi, or if it affects Sigil ePub-to-mobi conversions. When I look at my early Sigil ebooks, built from a Word-to-HTML file, the charset is Windows-1252 but the encoding is of course UTF-8. (I have never experienced an issue in my ebooks but wondering if I just got lucky.)
It also doesn't makes sense to me to tell users to avoid UTF-8, especially as in the Publishing Guidelines (Section 6.6) Amazon give as an example UTF-8 coding. So is the above issue a Mac or Linux (or other non-Windows platform) thing?