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=head4 Get (XML) element

The first step of changing the DOM is to get an element on which
the changes are applied. The ID() function is used for that:

  my $elem = ID('main');

The ID() function only works WHILE the application is running.
Any changes to the object returned by the ID() function are transferred
immedietly (asynchronous) to the XUL application/client.

=head4 Get child (XML) elements

  my $child1 = ID('main')->child(0);
  my $numchildren = ID('main')->numchildren();

=head4 Create/insert/append (XML) elements

  my $e = Div(id => 'container', 'style' => 'background:black', 
            Button(label => 'click'));