This is an example of absolute panel. Advantage of absolute panel is that you can adjust the element position just by giving the position from left and top.
Reference:
Example demo:
Example Code:
function doGet(){
var app = UiApp.createApplication();
var absPanel = app.createAbsolutePanel().setWidth('200').setHeight('300');
var ta = app.createTextArea();
var tb = app.createTextBox();
var anchor = app.createAnchor('This is Anchor',
'https://sites.google.com/site/appsscripttutorial');
var label = app.createLabel('This is label');
var lb = app.createListBox().addItem('Item1').addItem('Item2');
absPanel.add(ta, 0, 0);//position is from left and top in pixels.
absPanel.add(tb, 25, 70);
absPanel.add(anchor,100,90);
absPanel.add(label, 10, 20);
absPanel.add(lb, 50, 100);
app.add(absPanel);
return app;
}