Does the HTML 'ID' tag allow UTF-8 encoded characters?

What I mean is开发者_如何学C, is it valid to have html tag like this

<div id="t_реклама">Some text</div>

And second question, if this is not legal, then would the urlencoded version (like percent-encoded) value be allowed?

Also, will Javascript have problem parsing value of utf-8 id?

I don't think this is allowed:

ID and NAME tokens must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens ("-"), underscores ("_"), colons (":"), and periods (".").

http://www.w3.org/TR/html401/types.html#type-name

I'm guessing the reason you want to do this is to store some information in the HTML to retrieve later.

If that's the case, try using a custom HTML attribute:

<div id="myDiv" data-myattribute="t_реклама"></div>