UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36

Steps to reproduce the problem:
var xmlText = `<?xml version="1.0" encoding="UTF-8"?>
<Ping>
<Value>Test</Value>
</Ping>`;

var xml = new DOMParser().parseFromString(xmlText, "application/xml");

var xmlSerializedText = new XMLSerializer().serializeToString(xml);
if (xmlSerializedText !== xmlText) {
  console.log(xmlSerializedText);
  throw Error("Wrong serialized text");
}
alert("Success");

What is the expected behavior?
Must show Success dialog if serialized text is equal to xmlText variable

What went wrong?
Serialized text is different from xmlText variable
<?xml version="1.0" encoding="UTF-8"?> <- Doesn't have \n symbol

Did this work before? N/A 

Does this work in other browsers? Yes

Chrome version: 67.0.3396.99  Channel: n/a
OS Version: OS X 10.13.4
Flash Version: 

You can run test script http://jsfiddle.net/rydcgx76/1/

Mozilla works fine
Safari has the same problem