ladybird/Tests/LibWeb/Text/input/HTML/form-add-dynamic-formdata.html

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<!DOCTYPE html>
<form id="test-form">
<input type="text" name="field1" value="value1">
</form>
<script src="../include.js"></script>
<script>
test(() => {
const form = document.getElementById('test-form');
form.addEventListener('formdata', (event) => {
event.formData.append('field2', 'value2');
});
const formData = new FormData(form);
println(`formData.get('field1') === 'value1': ${formData.get('field1') === 'value1'}`);
println(`formData.get('field2') === 'value2': ${formData.get('field2') === 'value2'}`);
});
</script>