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<!DOCTYPE html>
<html>
<body>
<form>
<input id='field1' type='text' value='Field 1'>
<input id='field2' type='text' value='Field 2'>
</form>
<script>
document.getElementById('field1').addEventListener(
'blur', event => document.getElementsByTagName('body')[0]
.setAttribute('style', 'background-color: #436e58'))
</script>
</body>
</html>
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