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Cannot get "evaluateJavaScript" to update element in HTML

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I have a HTML page which shall contain dynamic contents, which looks like this: <html>   <head>     <meta charset="utf-8">     <title>Test</title>     <style>         body, html, ul {         margin: 0;         padding: 0;         font-family: 'trebuchet ms', helvetica, arial, sans-serif, verdana;   background: transparent;       }         #leftMessages {         position: absolute;         top: 0;         left: 0;         width: 20%;       }         .messages {         padding: 0 20px;       }         .messages li {         background: rgba(0,0,0,0.75);         border-radius: 10px;         color: #fff;         margin: 8px 0;         padding: 5px 20px;       } </head>   <body>      <ul id="leftMessages" class="messages">       <li>         <h1>Titel</h1>         <h2>Titel</h2>         <p>Titel</p>       </li>       <li>         <h1>Titel</h1>         <h2>Titel</h2>         <p>Titel</p>       </li>     </ul>   </body> </html> I have tried to update the contents in the following matter: QWebView webView = new QWebView(); webView->setUrl(/path/to/above/html); webView->page()->mainFrame()->evaluateJavaScript("document.getElementById(\"leftMessages\")[removed] = \"<li>This is a test</li>\";"); The HTML is shown but I am not able to update any of the elements – they just have the default values as set in th e HTML file. So my question is, how do I update my HTML file from Qt? The above procedure doesn’t work. Thanks and regards.

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