title: Thymeleaf classappend for multiple classes
body: <p>I want to add multiple classes using condition.</p>
  
  <pre><code>&lt;div th:classappend="x.isTrue ?'class1' "  &gt;&lt;/div&gt;
  </code></pre>
  
  <p>I want something like </p>
  
  <pre><code>&lt;div th:classappend="x.isTrue ?'class1' and "y.isTrue ?'class2'"  &gt;&lt;/div&gt;
  </code></pre>