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chromium/third_party/blink/web_tests/fast/files/blob-slice-type.html 

<!DOCTYPE html>
<title>Blob.slice() type argument</title>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script>
test(function() {
  assert_equals(new Blob().slice(0, 0, null).type, "null");
}, 'Blob.slice() with type argument as null.');

test(function() {
  assert_equals(new Blob().slice(0, 0, undefined).type, "");
}, 'Blob.slice() with type argument as undefined.');

test(function() {
  assert_equals(new Blob().slice(0, 0, 'hello\u0100').type, "");
}, 'Blob.slice() with non-ASCII type.');

test(function() {
  assert_equals(new Blob().slice(0, 0, 'hello\u001F').type, "");
  assert_equals(new Blob().slice(0, 0, 'hello\u00FF').type, "");
}, 'Blob.slice() with non-printable-ASCII type.');

test(function() {
  assert_equals(new Blob().slice(0, 0).type, "");
}, 'Blob.slice() with no type argument passed.');
</script>