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

length · WebPlatform Docs

Gets the number of characters in a text node.

Property of dom/CharacterDatadom/CharacterData

Note: This property is read-only.

var textLength = textualNode.length;

Returns an object of type NumberNumber

The number of characters in the node.

var phrase = document.createTextNode ("A flawed plan today is better than a perfect plan tomorrow.");

alert(phrase.length);

This example uses the length property to specify where a Text node is split by using the splitText method.

<script>
function fnChangeValue(){
   var oListItem = document.createElement("LI");
   var oList = document.getElementById("oList");
   oList.appendChild(oListItem);
   var oNode = oList.firstChild.childNodes(0);
   var oTextNode = oList.firstChild.childNodes(0);
   var oSplit = oTextNode.splitText(oTextNode.length/2);
   oListItem.appendChild(oSplit);
}
</script>
<ul id="oList" onclick="fnChangeValue()">
<li>Start Here</li>
</ul>

DOM Level 1

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