How to inject CSS in WebBrowser control?

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 2  2022

As per my knowledge,there is a way to inject javascript into the DOM. Below is the sample code that injects javascript with the webbrowser control:

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青春惊慌失措

2020-12-01 08:46

I didn't try this myself but since CSS style rules can be included in a document using the <style> tag as in:

<html>
<head>
<style type="text/css">
    h1 {color:red}
    p {color:blue}
</style>
</head>

you could try giving:

HtmlElement head = webBrowser1.Document.GetElementsByTagName("head")[0];
HtmlElement styleEl = webBrowser1.Document.CreateElement("style");
IHTMLStyleElement element = (IHTMLStyleElement)styleEl.DomElement;
IHTMLStyleSheetElement styleSheet = element.styleSheet;
styleSheet.cssText = @"h1 { color: red }";
head.AppendChild(styleEl);

a go. You can find more info on the IHTMLStyleElement here.

Edit

It seems the answer is much much simpler than I originally thought:

  using mshtml;

  IHTMLDocument2 doc = (webBrowser1.Document.DomDocument) as IHTMLDocument2;
  // The first parameter is the url, the second is the index of the added style sheet.
  IHTMLStyleSheet ss = doc.createStyleSheet("", 0);

  // Now that you have the style sheet you have a few options:
  // 1. You can just set the content as text.
  ss.cssText = @"h1 { color: blue; }";
  // 2. You can add/remove style rules.
  int index = ss.addRule("h1", "color: red;");
  ss.removeRule(index);
  // You can even walk over the rules using "ss.rules" and modify them.

I wrote a small test project to verify that this works. I arrived at this final result by doing a search on MSDN for IHTMLStyleSheet, upon which I happened across this page, this page and this one.

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野的像风

2020-12-01 08:57

For me it seemed to be as simple as setting my style first in the DocumentText. Obviously not best practices but it works for simple CSS.

webBrowser1.DocumentText = "<style> " +
                                 "body { " +
                                    "font-family: Algerian; " +
                                  "} " +
                            "</style> "+
                            "<a href='https://www.google.ca'>Test</a>";

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