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Showing content from https://webplatform.github.io/docs/dom/CharacterData/replaceData below:

replaceData ยท WebPlatform Docs

replaceData Summary

Replaces a specified range of characters in the node with a new character string.

Method of dom/CharacterDatadom/CharacterData

Syntax
 textualNode.replaceData(offset, count, text);
Parameters offset
Data-type
String

The zero-based offset from which to start.

count
Data-type
String

The number of characters to replace.

text
Data-type
String

The new character string.

Return Value

No return value

Examples
//create text node
var phrase = document.createTextNode ("A flawed plan today is much better than a perfect plan tomorrow.");
//replace "much" with "way"
phrase.replaceData(23, 4, "way");
//report result
alert(phrase.data);
Notes

If the sum of the offset and count parameters exceeds the number of characters in the object, then all the characters from the offset to the end of the data are replaced.

Related specifications
DOM Level 3 Core
Recommendation
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