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prompt(prompt [, value [, title]] )
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Parameters
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Stringprompt
Specifies the message to display in the dialog box
Stringvalue
[optional] Specifies the initial value displayed in the text input field.
Stringtitle
[optional] Specifies the dialog box title. If omitted, the title defaults to "Prompt".
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Returns
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String. Returns the string in the text input field if the user clicks OK. Returns null if the user clicks Cancel.
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