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<!DOCTYPE html>
<html>
<head>
<script src="../../../resources/js-test.js"></script>
<script src="../resources/common.js"></script>
</head>
<body>
<script>
description('Checks incomplete datetime formats are rejected.');

var input = document.createElement('input');
input.type = 'month';
document.body.appendChild(input);

function setDateTimeFormat(pattern) {
    var value = input.value;
    getElementByPseudoId(internals.youngestShadowRoot(input), '-webkit-datetime-edit').setAttribute('pattern', pattern);
    input.value = ''; // Updates the element for new format
    input.value = value;
}

input.value = '1999-07';

debug('Valid format');
setDateTimeFormat('MM-yyyy');
shouldBeEqualToString('getUserAgentShadowTextContent(input)', '07-1999');

debug('Invalid format, fallback to yyyy-MM');
setDateTimeFormat('mm-yyyy');
shouldBeEqualToString('getUserAgentShadowTextContent(input)', '1999-07');
setDateTimeFormat('M');
shouldBeEqualToString('getUserAgentShadowTextContent(input)', '1999-07');

</script>
</body>
</html>