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<!DOCTYPE html> <html> <head> <title>Der Titel des Dokuments</title> </head> <body> <select> <optgroup label="Bücher"> <option value="html">HTML</option> <option value="css">CSS</option> </optgroup> <optgroup label="Snippets"> <option value="java">Java</option> <option value="linux">Linux</option> <option value="git">Git</option> </optgroup> </select> </body> </html>