HTML 中的 <isindex> 元素是什么?

What is the <isindex> element in HTML?

显然,在对 HTML <head> 元素进行了一些研究之后,我了解到 <isindex> 元素的半存在性以及它似乎从未完全实现过。 .. 我相信。此元素背后的意图是什么?为什么弃用它?

来自 MDN 参考:

<isindex> is an obsolete HTML element that puts a text field in a page for querying the document. <isindex> was providing a single line text input for entering a query string. When sent, the server would return a list of pages matching the query. It supports depended on both the browser and the server to react to the query.

<isindex> is deprecated as of HTML 4.01, because the same behaviour can be achieved with an HTML form.