From the react/examples:
Encoding is declared as described below. In the 9 files.
https://github.com/facebook/react/blame/master/examples/basic-jsx-external/index.html#L4
<meta http-equiv='Content-type' content='text/html; charset=utf-8'>
However, in another example it has been declared in another writing.
https://github.com/facebook/react/blob/master/examples/jquery-mobile/index.html#L4
<meta charset="utf-8">
I think that we should unify to the latter way. In HTML5, it is possible to provide a short code by using the charset attribute.