Thanks for the quick reply; I got a bit more info when I took the screenshot:
when I mouse over what should be the “<” or the “>”, I now see the message:
Special characters must be escaped ;
[ > ]
a) I do not know how to “escape” the characters. The escape key (seemed logical even though I expected it would not work!), the backslash key (about five minutes of coding in python recently), and enclosing in the brackets as shown, also did not do the trick.
b) even if something like that “worked”, the lessons on HTML would quickly become impractical since the real work is all done by tagging, and that would likely be the point of almost all the lessons in the sequence, wouldn’t it?