What does `InputElementDiv` stand for in ECMAScript lexical grammar

The lexical grammar of ECMAScript lists the following token classes for lexical analyzer (lexer):

InputElementDiv::
    WhiteSpace
    LineTerminator
    Comment
    CommonToken
    DivPunctuator
    RightBracePunctuator
InputElementRegExp::
    WhiteSpace
    LineTerminator
    Comment
    CommonToken
    RightBracePunctuator
    RegularExpressionLiteral
InputElementRegExpOrTemplateTail::
    WhiteSpace
    LineTerminator
    Comment
    CommonToken
    RegularExpressionLiteral
    TemplateSubstitutionTail
InputElementTemplateTail::
    WhiteSpace
    LineTerminator
    Comment
    CommonToken
    DivPunctuator
    TemplateSubstitutionTail

While I understand the nested classes like WhiteSpace, LineTerminator, I don't understand what the top level classes are: InputElementDiv, InputElementRegExp, InputElementRegExpOrTemplateTail and InputElementTemplateTail. Can anyone please clarify?