W3cubDocs

CharacterData.deleteData()

The deleteData() method of the CharacterData interface removes all or part of the data from this CharacterData node.

characterData.deleteData(offset, count)

offset: The number of bytes from the start of the data to remove from. 0 is the first character of the string.
count: The number of bytes to remove.

None.

IndexSizeError DOMException: Thrown if offset is greater than the length of the contained data.

<span>Result: </span>A long string.

let span = document.getElementsByTagName("span")[0];
let textnode = span.nextSibling;

textnode.deleteData(1, 5);

Specification
DOM Standard # dom-characterdata-deletedata

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`deleteData`	1	12	1	6	≤12.1	1	1	18	4	≤12.1	1	1.0