title: How to click a button in Qt WebEngine?
body: <p>How to click a button in the newest Qt5.7 <code>WebEngine</code>?
  In the past <code>Webkit</code>, we could do this to click a button:</p>
  
  <pre><code>QWebElement button = frame-&gt;findFirstElement("input[id=search]");
  button.evaluateJavaScript("this.click()");
  </code></pre>
  
  <p>So, how can I do the same thing with Qt <code>WebEngine</code>?</p>
  
  <p>Thanks for any suggestion.</p>