Markup block - Gen<None> - 25 - (0:0,0)
    Tag block - Gen<TagHelper> - 12 - (0:0,0) - p - ptaghelper
        StartTagAndEndTag - <p> ... </p>
        SyntaxKind.HtmlTextLiteral - [Hello] - [3..8) - FullWidth: 5 - Slots: 1
            SyntaxKind.Text;[Hello];
    SyntaxKind.HtmlTextLiteral - [ ] - [12..13) - FullWidth: 1 - Slots: 1
        SyntaxKind.Whitespace;[ ];
    Tag block - Gen<TagHelper> - 12 - (13:0,13) - p - ptaghelper
        StartTagAndEndTag - <p> ... </p>
        SyntaxKind.HtmlTextLiteral - [World] - [16..21) - FullWidth: 5 - Slots: 1
            SyntaxKind.Text;[World];
