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zIndex property

Sets or retrieves the stacking order of positioned objects.

Syntax

Integer value = object.put_zIndex(Variant v);Integer value = object.get_zIndex(Variant* vOrder);

Property values

Type: VARIANT

auto (auto)

Default. String that specifies the stacking order of the positioned objects based on the order in which the objects appear in the HTML source.

order (order)

Integer that specifies the position of the object in the stacking order.

String format

auto | order

CSS information

Applies ToAll elements
Mediavisual
Inheritedno
Initial Value

Remarks

Positive IHTMLCurrentStyle::zIndex values are positioned above a negative (or lesser value) IHTMLCurrentStyle::zIndex. Two objects with the same IHTMLCurrentStyle::zIndex are stacked according to source order. A positive value positions the element above text that has no defined IHTMLCurrentStyle::zIndex, and a negative value positions it below. Set this parameter to NULL to remove the attribute.

The IHTMLCurrentStyle::zIndex property only applies to objects that have the IHTMLCurrentStyle::position property set to relative or absolute.

The property does not apply to windowed controls, such as select objects.

Input from pointing devices, such as a 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:

As of Microsoft Internet Explorer 5.5, the iframe object is windowless and supports the IHTMLCurrentStyle::zIndex property. In earlier versions of Windows Internet Explorer, the iframe object is windowed and, like all windowed controls, ignores the IHTMLCurrentStyle::zIndex property. If you maintain Web pages that were designed for earlier versions of Internet Explorer that do not support the IHTMLCurrentStyle::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 IHTMLCurrentStyle::visibility attribute to hide windowed controls that you want an iframe object to overlap.

As of Windows Internet Explorer 7, the select property is windowless and can make use of the IHTMLCurrentStyle::zIndex attribute and the IHTMLCurrentStyle::zIndex property.

Windows Internet Explorer 8 and later. When you access a property that has not been explicitly set, Internet Explorer returns the default value of the property. The default value of the IHTMLCurrentStyle::zIndex property for the currentStyle object depends on the document compatibility mode used to display the Web page. When a page is displayed in IE8 Standards mode, the default value is auto. The default value is 0 in IE7 Standards mode and an empty string ("") in IE5 (Quirks) mode. Applications that rely on specific default values for the IHTMLCurrentStyle::zIndex property of the currentStyle object should be modified to take the document compatibility mode into account.

You can use the IHTMLCurrentStyle::zIndex property on Grid items. While the IHTMLCurrentStyle::zIndex property normally only applies to objects that have the IHTMLCurrentStyle::position property not set to static, the IHTMLCurrentStyle::zIndex property applies to Grid items even when the IHTMLCurrentStyle::position property is set to static.

Requirements

Minimum supported client

Windows XP [desktop apps only]

Minimum supported server

Windows Server 2003 [desktop apps only]

Header

Mshtml.h

IDL

Mshtml.idl

DLL

Mshtml.dll

 

 

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