Quirks Mode, IE7 Mode, IE8 Mode, IE9 Mode, IE10 Mode, and IE11 Mode (All Versions)

The HTMLIsIndexElement interface indicates that the document contains a searchable index.

The HTMLIsIndexElement interface has been extended with the following attribute:

To use the isIndex tag, the server must provide a search engine that supports this tag. The script to be executed on the server can be specified by the IHTMLIsIndexElement::action property on this tag.

The isIndex element can be used only within the head tag.

 //Introduced in Internet Explorer.
 interface HTMLIsIndexElement : HTMLElement {
             attribute DOMString       action;