Feb 1, 2010 · An ID must be unique to be valid XHTML. An ID must match tighter rules, e.g., no spaces, start with letter or _, only contain letters, numbers or a limited number of other characters.
Feb 1, 2010 · An ID must be unique to be valid XHTML. An ID must match tighter rules, e.g., no spaces, start with letter or _, only contain letters, numbers or a limited number of other characters.
