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<!doctype html>
<meta charset="utf-8">
<title>FormData.append (with form element)
</title>
<link rel="help" href="https://xhr.spec.whatwg.org/#dom-formdata-append">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<form id="form"></form>
<script>
test(function() {
var fd = new FormData(document.getElementById("form"));
fd.append('key', 'value1');
assert_equals(fd.get('key'), "value1");
}, 'testFormDataAppendToForm1');
test(function() {
var fd = new FormData(document.getElementById("form"));
fd.append('key', 'value2');
fd.append('key', 'value1');
assert_equals(fd.get('key'), "value2");
}, 'testFormDataAppendToForm2');
test(function() {
var fd = new FormData(document.getElementById("form"));
fd.append('key', undefined);
assert_equals(fd.get('key'), "undefined");
}, 'testFormDataAppendToFormUndefined1');
test(function() {
var fd = new FormData(document.getElementById("form"));
fd.append('key', undefined);
fd.append('key', 'value1');
assert_equals(fd.get('key'), "undefined");
}, 'testFormDataAppendToFormUndefined2');
test(function() {
var fd = new FormData(document.getElementById("form"));
fd.append('key', null);
assert_equals(fd.get('key'), "null");
}, 'testFormDataAppendToFormNull1');
test(function() {
var fd = new FormData(document.getElementById("form"));
fd.append('key', null);
fd.append('key', 'value1');
assert_equals(fd.get('key'), "null");
}, 'testFormDataAppendToFormNull2');
test(function() {
var fd = new FormData(document.getElementById("form"));
assert_throws_js(TypeError, () => {fd.append('name', "string", 'filename')});
}, 'testFormDataAppendToFormString');
test(function() {
var fd = new FormData(document.getElementById("form"));
assert_throws_js(TypeError, () => {fd.append('name', new URLSearchParams(), 'filename')});
}, 'testFormDataAppendToFormWrongPlatformObject');
</script>
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