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

The IHTMLCSSStyleDeclaration::zIndex property only applies to objects that have the IHTMLCSSStyleDeclaration::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 IHTMLCSSStyleDeclaration::zIndex property. In earlier versions of Windows Internet Explorer, the iframe object is windowed and, like all windowed controls, ignores the IHTMLCSSStyleDeclaration::zIndex property. If you maintain Web pages that were designed for earlier versions of Internet Explorer that do not support the IHTMLCSSStyleDeclaration::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 IHTMLCSSStyleDeclaration::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 IHTMLCSSStyleDeclaration::zIndex attribute and the IHTMLCSSStyleDeclaration::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 IHTMLCSSStyleDeclaration::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 IHTMLCSSStyleDeclaration::zIndex property of the currentStyle object should be modified to take the document compatibility mode into account.

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