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Editorial Team
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Asked: 2026-06-01T16:25:03+00:00

I know it is easy to add elements and attributes to HTML documents with

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I know it is easy to add elements and attributes to HTML documents with the HTML agility pack. But how can I add a doctype (e.g. the HTML5 one) to an HtmlDocument with the html agility pack? Thank you

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1 Answer

  1. Editorial Team

    The Html Agility Pack parser treats the doctype as a comment node.
    In order to add a doctype to an HTML document simply add a
    comment node with the desired doctype to the beginning of the document:

    HtmlDocument htmlDoc = new HtmlDocument();

htmlDoc.Load("withoutdoctype.html");

HtmlCommentNode hcn = htmlDoc.CreateComment("<!DOCTYPE html>");

HtmlNode htmlNode = htmlDoc.DocumentNode.SelectSingleNode("/html");
htmlDoc.DocumentNode.InsertBefore(hcn, htmlNode);

htmlDoc.Save("withdoctype.html");

    Please note, that my code does not check for the existing of a doctype.

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