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

Document: createCDATASection() method - Web APIs

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createCDATASection() creates a new CDATA section node, and returns it.

data

A string containing the data to be added to the CDATA Section.

A CDATA Section node.

const doc = new DOMParser().parseFromString("<xml></xml>", "application/xml");
const cdata = doc.createCDATASection("Some <CDATA> data & then some");
doc.querySelector("xml").appendChild(cdata);
console.log(new XMLSerializer().serializeToString(doc));
// Displays: <xml><![CDATA[Some <CDATA> data & then some]]></xml>

• This will only work with XML, not HTML documents (as HTML documents do not support CDATA sections); attempting it on an HTML document will throw NOT_SUPPORTED_ERR.
• Will throw a NS_ERROR_DOM_INVALID_CHARACTER_ERR exception if one tries to submit the closing CDATA sequence (]]>) as part of the data, so unescaped user-provided data cannot be safely used without this method getting this exception (createTextNode() can often be used in its place).

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