I read eBooks on older devices (webOS tablets, circa 2011) that can't render fancy new HTML entities for things like smart quotes. They just end up garbled. So I modified the very handy
punctuationsmarten-sigil-plugin to go the other way.
This plug-in replaces the entities for smart quotes, ellipsis, and other common modern niceties with their simpler equivalents, readying content for consumption on older devices.
The source, and a release .zip, is here:
https://github.com/codepoet80/punctu...n-sigil-plugin
Would love to have it available in the official list -- any idea how I could submit for that?