File: test_input_datetime_preventDefault.html

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<!doctype html>
<title>Test for bug 1848158</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script src="/tests/SimpleTest/EventUtils.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
<input id="input" type="date" value="1998-01-22">
<script>
SimpleTest.waitForExplicitFinish();
SimpleTest.waitForFocus(function() {
  let value = input.value;

  input.addEventListener("keydown", function(e) {
    e.preventDefault();
  });

  isnot(value, "", "should have a value");

  input.focus();
  synthesizeKey("KEY_Backspace");
  is(input.value, value, "Value shouldn't change");
  SimpleTest.finish();
});
</script>