Tooltip with Apache Wicket 6

This is the code to create a tooltip with Apache Wicket and without Javascript.

              final WebMarkupContainer jexlHelp = JexlHelpUtil.getJexlHelpWebContainer("jexlHelp");
              this.add(jexlHelp);
              final AjaxLink questionMarkJexlHelp = JexlHelpUtil.getAjaxLink(jexlHelp, "questionMarkJexlHelp");
              this.add(questionMarkJexlHelp);

Where this is the Java class to generate previous :

              package org.apache.syncope.console.commons;

              import org.apache.wicket.ajax.AjaxRequestTarget;
              import org.apache.wicket.ajax.markup.html.AjaxLink;
              import org.apache.wicket.markup.html.WebMarkupContainer;
              import org.apache.wicket.markup.html.link.ExternalLink;

              public class JexlHelpUtil {

              private static final String JEXL_SYNTAX_URL = "http://commons.apache.org/jexl/reference/syntax.html";

              public static WebMarkupContainer getJexlHelpWebContainer(final String wicketId) {
              final WebMarkupContainer jexlHelp = new WebMarkupContainer(wicketId);
              jexlHelp.setVisible(false);
              jexlHelp.setOutputMarkupPlaceholderTag(true);
              jexlHelp.setOutputMarkupId(true);
              jexlHelp.add(new ExternalLink("jexlLink", JEXL_SYNTAX_URL));
              return jexlHelp;
              }

              public static AjaxLink getAjaxLink(final WebMarkupContainer wmc, final String wicketId) {
              AjaxLink questionMarkJexlHelp = new AjaxLink(wicketId) {

              boolean toogle = false;

              private static final long serialVersionUID = -7978723352517770644L;

              @Override
              public void onClick(AjaxRequestTarget target) {
              toogle = !toogle;
              wmc.setVisible(toogle);
              target.add(wmc);
              }
              };
              return questionMarkJexlHelp;
              }
              }

This is html of the page:

<div class="help">
   <a wicket:id="questionMarkJexlHelp" href="#" alt="Click to help" title="Click to help"><img src="/img/help.png"/></a>
   <div wicket:id="jexlHelp" class="tooltip">
      <wicket:message key="jexl_info"/>
         <ul>
            <li><wicket:message key="jexl_ex1"/></li>
            <li><wicket:message key="jexl_ex2"/></li>
         </ul>
      <a href="#" wicket:id="jexlLink" target="_blank"><wicket:message key="jexl_syntax_url"/></a>
   </div>
</div>

Its CSS:

              .tooltip{
              position: absolute;
              left: -72px;
              top: 23px;
              z-index: 1000000;
              line-height: normal;
              _padding-top: 0em;
              width: 19em;
              border: 1px solid black;
              background-color: whitesmoke;
              opacity: 0.9;
              color: black;
              padding: 3px;
              font-size: 11px;
              }

              .help {
              position: relative;
              float: right;
              top: 3px;
              left: -15px;
              }

              .help a {
              color: #463;
              text-decoration: none;
              }

              .help a:hover {
              color: blue;
              text-decoration: none;
              }

The properties for the messagges:

              jexl_info=This field expects a JEXL expression, for example:
              jexl_ex1=surname + ',' + firstname
              jexl_ex2='new.' + surname
              jexl_syntax_url=Full JEXL reference

Clicking on question mark the help tooltip will appear and clicking again on it the tooltip will disappear; this is the result:

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