What is this? What happens when the code is printed in color, although the code works? Very weird?

Question

https://code.sololearn.com/WwohMd17BA3h/?ref=app

Answer 1

Vučko/Вучко/Vuchko
The comment in the title tag is written not as it is necessary. Missed two hyphens. Therefore, the code looks like this, and the browser does not understand where the comment. Actually, the comment in the title tag doesn't seem to work.

Answer 2

Hi. This is for tour help. The editor shows you that these words in color are reserves for languaje, such as commands... in This case are HTML Tags.

Answer 3

they indicate a special or comman command so it increases convenience more