ISINDEX | NN n/a IE n/a DOM 1
The ISINDEX object reflects the ISINDEX element. Since this element is deprecated in HTML 4.0 and is omitted from Internet Explorer 4's developer documentation, it wouldn't be surprising if this object disappears before the DOM recommendation is released. The description of the prompt property is purely speculative, based on the corresponding attribute in the HTML element.

prompt | NN n/a IE n/a DOM 1
| Read/Write
The prompt message for the text entry field.
Value String.
Default | None.