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To assign values of the dynamically created textarea to local storage, you can follow these steps:

1. Create a function to dynamically create the textarea element.

function createTextarea() {
  var textarea = document.createElement('textarea');
  // add any attributes or properties you need for the textarea
  return textarea;
}

1. Assign a unique identifier or name to the textarea element to use later for saving the value.

function createTextarea(id) {
  var textarea = document.createElement('textarea');
  textarea.id = id;
  // add any attributes or properties you need for the textarea
  return textarea;
}

1. When the form is submitted, loop through all the dynamically created textarea elements and save their values to local storage.

function saveTextareaValues() {
  var textareas = document.getElementsByTagName('textarea');
  for (var i = 0; i < textareas.length; i++) {
    localStorage.setItem(textareas[i].id, textareas[i].value);
  }
}

1. To retrieve the value of a specific textarea element, use the following code.

var value = localStorage.getItem('textarea1');

Note: Always check if local storage is available in the user's browser before using it, and always sanitize the input data to prevent any security issues.