CSS z-index in xhtml and object

Alternative with PNG for comparison.
The text 'Maybe text for navigation menu.' should be displayed on top, because it is fixed positioned an has the highest z-index in CSS. Try to scroll the page. The correct behaviour is especially importent for css-Layout with position: absolute and position: fixed. Else it will be possible, that the menu of the project becomes inaccessible with a wrong overlapping object.

Maybe logo or text for navigation menu.
Pastel Blue Rectangle

Apperently this object can't be embedded. Save it or try an external program to display the PNG:
Pastel blue rectangle

The same PNG is shown here with img-tag:

Pastel blue rectangle