Why doesn't the Blob constructor work in the Android smartphone browser?

Question

JavaScript

Hello kitties. I can't figure out the problem...

<button onclick="test()">Тест</button>

function test(){
  var newTest = new Blob(['hello world!!!!'], {type: 'text/plain'});
  alert(newTest);
  alert(newTest.size);
}

When I check on the computer, it also displays that it is an object and what size it is.

But when I build in PhoneGap Builder, nothing works.

Only jQueryMobile and Cordova are included in the project.

Has anyone encountered this before? What could be the problem?