An HTML tag that turns on searching in the client. Documents can use a network navigator's capabilities to accept a search string and send it to the server to access a searchable index without using forms. In order to use ISINDEX, you must create a query handler.
Quoted from HTML specification 2.0, a work in progress: The ISINDEX element informs the browser that the document is an index document. An index document can be queried with a keyword search by adding a question mark to the end of the document address, followed by a list of keywords separated by plus signs. See the network address format for more information.
Deprecated. Defines a single-line input field 3.0 3.0 TF