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Public WebView view;
var url = "javascript:(function() { var parent = document.getElementsByTagName('head').item(0);var script = document.createElement('script'); script.type = 'text/javascript'; script.innerHTML =\""+ content + "\";parent.appendChild(script)})()";
view.LoadUrl(url);
Mögliche Duplikat [Wie DOM-Element Skript hinzuzufügen Abschnitt zu gehen? ] (https://stackoverflow.com/questions/18784920/how-to-add-dom-element-script-to-head-section) –