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+<!DOCTYPE html>
+<title>form.elements: interfaces</title>
+<link rel="author" title="Ms2ger" href="mailto:ms2ger@gmail.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#dom-form-elements">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#htmlformcontrolscollection">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+test(function() {
+ var form = document.createElement("form");
+ ["HTMLFormControlsCollection", "HTMLCollection"].forEach(function(i) {
+ test(function() {
+ assert_true(i in window, "Interface should exist")
+ assert_true(form.elements instanceof window[i],
+ "elements should implement the interface")
+ }, "Testing interface " + i)
+ })
+})
+</script>