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Sets or retrieves the stacking order of positioned object s.
Syntax
| { z-index : vOrder } |
| object.style.zIndex [ = vOrder ] |
Possible Values
| vOrder | Variant that specifies or receives one of the following values.
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The property is read/write for all objects except the following, for which it is read-only: currentStyle . The property has a default value of auto . The Cascading Style Sheets (CSS) attribute is not inherited.
Expressions can be used in place of the preceding value(s), as of Microsoft® Internet Explorer 5. For more information, see About Dynamic Properties .
Remarks
Positive z-index values are positioned above a negative (or lesser value) z-index . Two objects with the same z-index are stacked according to source order. A positive value positions the element above text that has no defined z-index , and a negative value positions it below. Set this parameter to null to remove the attribute.
The zIndex property only applies to objects that have the position property set to relative or absolute .
The property does not apply to windowed controls, such as select objects.
As of Microsoft® Internet Explorer 5.5, the iframe object is windowless and supports the zIndex property. In earlier versions of Internet Explorer, the iframe object is windowed and, like all windowed controls, ignores the zIndex property. If you maintain Web pages that were designed for earlier versions of Internet Explorer that do not support the zIndex property, you might want to redesign the pages, especially if the pages contain iframe objects that are stacked on top of windowed controls, such as select objects. You can use the visibility attribute to hide windowed controls that you want an iframe object to overlap. You can also position windowed controls so that iframe objects do not overlap them.
Input from pointing devices, such as the mouse, does not penetrate through overlapping elements even if the elements are not visible. This is also true for positioned elements with a negative z-index unless:
Examples
The following examples use the z-index attribute and the zIndex property to change the stacking order of objects.This example uses an inline style sheet to set the stacking order.
<IMG SRC="cone.jpg" STYLE="position:absolute; top:100px; left:100px; z-index :4">This example uses inline scripting to set the stacking order.
<IMG ID="cone" SRC="cone.jpeg" STYLE="position:absolute;top:10px;left:10px;" onclick="cone.style. zIndex =1; sphere.style. zIndex =2">Standards Information
This property is defined in Cascading Style Sheets (CSS), Level 2 (CSS2) .
Applies To
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A , ADDRESS , APPLET , B , BIG , BLOCKQUOTE , BUTTON , CAPTION , CENTER , CITE , CODE , COL , COLGROUP , currentStyle , CUSTOM , DD , defaults , DFN , DIR , DIV , DL , DT , EM , FIELDSET , FORM , I , IFRAME , INPUT type=button , INPUT type=checkbox , INPUT type=file , INPUT type=image , INPUT type=password , INPUT type=radio , INPUT type=reset , INPUT type=submit , INPUT type=text , ISINDEX , KBD , LABEL , LEGEND , LI , LISTING , MARQUEE , MENU , OL , P , PLAINTEXT , PRE , runtimeStyle , S , SAMP , SMALL , SPAN , STRIKE , STRONG , style , SUB , SUP , TABLE , TBODY , TD , TEXTAREA , TFOOT , TH , THEAD , TR , TT , U , UL , VAR , XMP | ||||||||||||
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