Markup block - Gen<None> - 16 - (0:0,0)
    Tag block - Gen<TagHelper> - 16 - (0:0,0) - p - PTagHelper
        StartTagAndEndTag - <p> ... </p>
        Tag block - Gen<TagHelper> - 4 - (3:0,3) - br - BRTagHelper
            StartTagOnly - <br>
        SyntaxKind.HtmlTextLiteral - [Hello] - [7..12) - FullWidth: 5 - Slots: 1
            SyntaxKind.Text;[Hello];
