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Showing content from https://developer.cdn.mozilla.net/en-US/docs/Web/API/CharacterData/length below:

CharacterData: length property - Web APIs

CharacterData: length property

Baseline Widely available

The read-only CharacterData.length property returns the number of characters in the contained data, as a positive integer.

Value

A positive integer with the length of the CharacterData.data string.

Example

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;
Specifications Browser compatibility

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