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chromium/third_party/blink/web_tests/external/wpt/selection/type.html 

<!doctype html>
<title>Selection.type tests</title>
<div id=log></div>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script src=common.js></script>
<script>
"use strict";

test(() => {
  assert_equals(getSelection().rangeCount, 0, "Sanity check");
  assert_equals(getSelection().type, "None");
}, "Empty selection");

for (var i = 0; i < testRanges.length; i++) {
  var endpoints = eval(testRanges[i]);
  if (!isSelectableNode(endpoints[0]) || !isSelectableNode(endpoints[2])) {
      continue;
  }
  test(() => {
    var range = rangeFromEndpoints(endpoints);
    getSelection().removeAllRanges();
    getSelection().addRange(range);
    if (endpoints[0] == endpoints[2] && endpoints[1] == endpoints[3]) {
      assert_equals(getSelection().type, "Caret");
    } else {
      assert_equals(getSelection().type, "Range");
    }
  }, testRanges[i]);
}
</script>