The return value is the boolean value of the XPathResult returned by Document.evaluate().

TYPE_ERR

In case XPathResult.resultType is not BOOLEAN_TYPE, a DOMException of type TYPE_ERR is thrown.

The following example shows the use of the booleanValue property.

html

<div>XPath example</div>
<p>Text is 'XPath example': <output></output></p>

js

const xpath = "//div/text() = 'XPath example'";
const result = document.evaluate(
  xpath,
  document,
  null,
  XPathResult.BOOLEAN_TYPE,
  null,
);
document.querySelector("output").textContent = result.booleanValue;