Why instead of Cyrillic hieroglyphs?

Question

Character encoding

Hello everyone, I have a problem with the display of the Russian font in Moizll'e and IE. There is an index.php page, it has a sliding menu, when you click the menu expands and through jquery the content is displayed, which is taken from the menu.html file.
Cyrillic content is displayed in hieroglyphs, although the rest of the text that is not loaded from a separate file is displayed normally. And the problem is only in Moizll'e and IE, in Opera and Chrome everything is fine. What could be the problem?

Answer 1

uploaded file encoding. open in notepad++ and double check how you saved menu.html