This method is called when a progress is made during the loading of the
current location.
<p>
<p>The following fields in the <code>ProgressEvent</code> apply:
<ul>
<li>(in) current the progress for the location currently being loaded
<li>(in) total the maximum progress for the location currently being loaded
<li>(in) widget the <code>Browser</code> whose current URL is being loaded
</ul>
@param event the <code>ProgressEvent</code> related to the loading of the
current location of a <code>Browser</code>
This method is called when a progress is made during the loading of the current location. <p>
<p>The following fields in the <code>ProgressEvent</code> apply: <ul> <li>(in) current the progress for the location currently being loaded <li>(in) total the maximum progress for the location currently being loaded <li>(in) widget the <code>Browser</code> whose current URL is being loaded </ul>
@param event the <code>ProgressEvent</code> related to the loading of the current location of a <code>Browser</code>
@since 3.0