fredd,
I didn't find the HTML and head tag in the above code.
Did you set the following property to true?
Editor.EditCompleteDocument Property
Specify whether a complete HTML document is being edited.
If false, the editor will only process content inside the page body i.e. all content inside of the <body>...</body> tags of a page. If true, the editor will process content outside the page body and preserve header tags (e.g. <head>...</head>, <title>...</title>, etc.).
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