IN JAVASCRIPT/ HTML5

Write a script based on the program in Exercise 11.13 that inputs several lines of text and uses "String" method "indexOf" to determinethe total number of occurences of each letter of the alphabet in the text. Uppercase and Lowercase letters should be counted together. Store the totals for each letter in an array, and print the values in tabular format in an HTML5 textarea after the totals have been determined.

(Exercise 11.13) Write a script that inputs several lines of text and a search character that uses "String" method "indexOf" to determine the number of occurences of the character in the text.