Ack! Great catch!
Apparently, it is not
entities, but
unicode non-breaking-space characters.
The only clue is seeing (something like) " "
in the DOM listing! (At
least in Safari - perhaps Chrome is better at showing this.)
A good code editor would
have (likely) shown this.
What did you use as a code
editor? Did you put these characters in there on purpose?
Maybe some copy-paste from
some example or documentation. I've seen code similarly broken
with Unicode left-quote/right-quote characters, etc. This turns up
with an unfortunately frequency in, for example, Kindle books...