z-index
Sets the stacking order of positioned elements.
Higher numbers are rendered on top or closer to the user.
So called after the depth dimension axis 'z'; as in x, y and z.
See also:
width
Sets the width of an element.
visibility
Sets whether an element is rendered on the page.
Setting visibility to hidden reserves the space for the element on the page but hides it from view.
Collapse applied to tables, removes the table row or column and allows the space it to be filled by other rows or columns. For other elements collapse, acts like hidden.
See also Display
top
Sets the position of the top edge of a positioned element relative to the position of it's positioned parent or the top edge of the page.
See also:
