2.2.41 [HTML] Section 17.8, The ISINDEX element

C0037:

The specification states:

 User agents may use the value of the prompt attribute as a title for the prompt.

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

The value of the prompt attribute is allowed as a visible label for the ISINDEX element.

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