Markup block - Gen<None> - 19 - (0:0,0)
    Tag block - Gen<TagHelper> - 19 - (0:0,0) - person - PersonTagHelper
        SelfClosing - <person age="12" />
        age - DoubleQuotes
            Code span - Gen<Expr> - [12] - ImplicitExpressionEditHandler;Accepts:AnyExceptNewline;ImplicitExpression[ATD];K14 - (13:0,13) - Tokens:1
                HtmlTokenType.Text;[12];
