HTMLAgilityPack: C# how to add strings with tags using CreateNode

I'm trying to build HTML output with data that might contain HTML tags (simple ones, link or
).

If I add such a string to my HTML using CreateNode, some unwanted filtering happens. How can I fix this?

Example:

string myText = "<strong>Intro</strong><br />Some Explanation";
node.ParentNode.ReplaceChild(HtmlNode.CreateNode(myText, node);

In my resulting HTML, only the strong text is outputted, the rest is gone.