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

ProcessingInstruction: target property - Web APIs

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The read-only target property of the ProcessingInstruction interface represent the application to which the ProcessingInstruction is targeted.

For example:

is a processing instruction whose target is xml.

A string containing the name of the application.

let parser = new DOMParser();
const doc = parser.parseFromString(
  '<?xml version="1.0"?><test/>',
  "application/xml",
);
const pi = doc.createProcessingInstruction(
  "xml-stylesheet",
  'href="mycss.css" type="text/css"',
);
doc.insertBefore(pi, doc.firstChild);

const output = document.querySelector("output");
output.textContent = `This processing instruction's target is: ${doc.firstChild.target}`;

The processing instruction line will be considered, and represented, as a Comment object.

<?xml version="1.0"?>
<pre></pre>

const node = document.querySelector("pre").previousSibling.previousSibling;
const result = `Node with the processing instruction: ${node.nodeName}: ${node.nodeValue}\n`;
document.querySelector("pre").textContent = result;

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