Alerting bold Unicode letters turns them into nonsense

Question

I am trying to alert bold text and here nulll suggested using bold unicode.

So I tried: alert(' '); and it worked as expected. But when I tried to use the exact same thing in a different document, it alerts this:

ð—¡ð—¼ð˜ð—µð—¶ð—»ð—´ ð˜ð—¼ ð—±ð—¼ð˜„ð—»ð—¹ð—¼ð—®ð—±

What am doing wrong and why does it work in a different document with the exact same code?

Thank you in advance and sorry for my English

Answer 1

Ok, so i found the solution, and it's pretty simple. All you need to do is just put <meta charset="UTF-8"> in the document head.

That works for me.