<isindex>
HTML <isindex> Tag
The <isindex> tag is used to display search strings in the current document. The tag is placed inside the <head> element.
The <isindex> is a deprecated HTML tag and not supported correctly by browsers. To define a single line input field, you need to use the <input> tag with the <label> tag, which executes the same function as the prompt attribute.
The <isindex> tag wasn’t implemented steadily across browsers in previous versions of HTML, and it has been obsolete since then. When you put the element into <head>, the browser would understand it as an action to provide a search function for a document. But today each document is searchable since browsers have a Find feature.
Syntax
Syntax （语法）
The <isindex> tag is empty, which means that the closing tag isn’t required. But in XHTML, the (<isindex>) tag must be closed (<isindex/>).
Example of the HTML <isindex> tag:
<!DOCTYPE html>
<html>
<head>
<isindex prompt="Search a text" />
</head>
</html>
Attributes
Attributes （属性）
| Attribute | Value | Description |
|---|---|---|
| prompt | hint-text | Specifies the text string that is displayed in front of the search query input field. If this attribute is not specified, the default browser will display its own text. |
| action | URL | Specifies URL programs, which perform the search. |
The <isindex> tag supports the Global Attributes and the Event Attributes.