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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/Node/normalize below:

Node: normalize() method - Web APIs

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The normalize() method of the Node interface puts the specified node and all of its sub-tree into a normalized form. In a normalized sub-tree, no text nodes in the sub-tree are empty and there are no adjacent text nodes.

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<output id="result"></output>

const wrapper = document.createElement("div");

wrapper.appendChild(document.createTextNode("Part 1 "));
wrapper.appendChild(document.createTextNode("Part 2 "));

let node = wrapper.firstChild;
let result = "Before normalization:\n";
while (node) {
  result += ` ${node.nodeName}: ${node.nodeValue}\n`;
  node = node.nextSibling;
}

wrapper.normalize();

node = wrapper.firstChild;
result += "\n\nAfter normalization:\n";
while (node) {
  result += ` ${node.nodeName}: ${node.nodeValue}\n`;
  node = node.nextSibling;
}

const output = document.getElementById("result");
output.innerText = result;

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