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

Document: createProcessingInstruction() method - Web APIs

Document: createProcessingInstruction() method

Baseline Widely available

createProcessingInstruction() generates a new processing instruction node and returns it.

The new node usually will be inserted into an XML document in order to accomplish anything with it, such as with node.insertBefore.

Syntax
createProcessingInstruction(target, data)
Parameters
piNode

The resulting ProcessingInstruction node.

target

A string containing the first part of the processing instruction (i.e., <?target … ?>)

data

A string containing any information the processing instruction should carry, after the target. The data is up to you, but it can't contain ?>, since that closes the processing instruction.

Return value

None (undefined).

Exceptions
InvalidCharacterError DOMException

Thrown if either of the following are true:

Examples
const doc = new DOMParser().parseFromString("<foo />", "application/xml");
const pi = doc.createProcessingInstruction(
  "xml-stylesheet",
  'href="mycss.css"',
);

doc.insertBefore(pi, doc.firstChild);

console.log(new XMLSerializer().serializeToString(doc));
// Displays: <?xml-stylesheet href="mycss.css" type="text/css"?><foo/>
Specifications Browser compatibility

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