Generally, you specify values for all four criteria: Left, Top, Right, and Bottom. You can also leave the Left
and Top values empty or use the keyword auto??”which causes the Left and Top values to be set at the origin
point: 0,0. If you leave any of the clipping values blank, the blank attributes are set to auto.
Z-index
One of an AP element??™s most powerful features is its capability to appear above or below other AP elements.
You can change this order, known as the z-index, dynamically. Whenever a new AP element is added,
Dreamweaver automatically increments the z-index??”AP elements with higher z-index values are positioned
above AP elements with lower z-index values. The z-index can be adjusted manually in either the
CSS-P Property inspector or the AP Elements panel. The z-index must be an integer, either negative or positive.
Although some Web designers use high values for the z-index, such as 3,000, the z-index is
completely relative. The only reason to increase a z-index to an extremely high number is to
ensure that a particular AP element remains on top.
Certain types of objects??”including Java applets, Plugins, and ActiveX controls??”ignore the z-index setting
when included in an AP element and appear as the uppermost AP element. However, certain ActiveX
controls??”most notably Flash??”can be made to respect the z-index.
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