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To place the selected text into the initial prompt input of a page's action, you can use the following JavaScript code:
var selectedText = window.getSelection().toString();
var userInput = prompt("Enter text:", selectedText);
The first line of the code gets the currently selected text using the window.getSelection() method and converts it to a string using the toString() method.
The second line uses the prompt() method to display a dialog box with a message "Enter text:" and an input field. By passing in the selectedText variable as the default value for the input field, it will be pre-filled with the selected text.
When the user submits the input field, the value entered will be stored in the userInput variable. You can then use this variable to carry out the desired action on the page.