The read-only CharacterData.length property returns the number of characters in the contained data, as a positive integer.
A positive integer with the length of the CharacterData.data string.
Note: CharacterData is an abstract interface. The examples below use Text, a concrete interface implementing it.
Length of the string in the <code>Text</code> node: <output></output>const output = document.querySelector("output");
const textNode = new Text("This text has been set using 'textNode.data'.");
output.value = textNode.length;