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chromium/third_party/blink/web_tests/wpt_internal/dom-clobbering/form.html 

<!DOCTYPE html>
<meta charset="utf-8">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script type="module">
import {WebFeature} from '/gen/third_party/blink/public/mojom/use_counter/metrics/web_feature.mojom.m.js';

// This test suite verifies that the following use counters work correctly:
// - kDOMClobberedShadowedFormPropertyAccessed
// - kDOMClobberedNotShadowedFormPropertyAccessed

test(() => {
    internals.clearUseCounter(document, WebFeature.kDOMClobberedShadowedFormPropertyAccessed);
    internals.clearUseCounter(document, WebFeature.kDOMClobberedNotShadowedFormPropertyAccessed);
    assert_false(internals.isUseCounted(document, WebFeature.kDOMClobberedShadowedFormPropertyAccessed));
    assert_false(internals.isUseCounted(document, WebFeature.kDOMClobberedNotShadowedFormPropertyAccessed));

    const form = document.createElement("form");
    const input = document.createElement("input");
    input.name = "someRandomName"
    form.appendChild(input);

    // Check if the property is actually clobbered, and this should also
    // trigger the use counter.
    assert_equals(form.someRandomName, input);

    assert_true(internals.isUseCounted(document, WebFeature.kDOMClobberedNotShadowedFormPropertyAccessed));
    assert_false(internals.isUseCounted(document, WebFeature.kDOMClobberedShadowedFormPropertyAccessed));


}, 'Non-shadowed clobbered property in form should be use-counted');

test(() => {
    internals.clearUseCounter(document, WebFeature.kDOMClobberedShadowedFormPropertyAccessed);
    internals.clearUseCounter(document, WebFeature.kDOMClobberedNotShadowedFormPropertyAccessed);
    assert_false(internals.isUseCounted(document, WebFeature.kDOMClobberedShadowedFormPropertyAccessed));
    assert_false(internals.isUseCounted(document, WebFeature.kDOMClobberedNotShadowedFormPropertyAccessed));

    const form = document.createElement("form");
    const input = document.createElement("input");
    input.name = "nodeName"
    form.appendChild(input);

    // Check if the property is actually clobbered, and this should also
    // trigger the use counter.
    assert_equals(form.nodeName, input);

    assert_false(internals.isUseCounted(document,WebFeature.kDOMClobberedNotShadowedFormPropertyAccessed));
    assert_true(internals.isUseCounted(document, WebFeature.kDOMClobberedShadowedFormPropertyAccessed));
}, 'Shadowed clobbered property should be use-counted');

test(() => {
    internals.clearUseCounter(document, WebFeature.kDOMClobberedShadowedFormPropertyAccessed);
    internals.clearUseCounter(document, WebFeature.kDOMClobberedNotShadowedFormPropertyAccessed);
    assert_false(internals.isUseCounted(document, WebFeature.kDOMClobberedShadowedFormPropertyAccessed));
    assert_false(internals.isUseCounted(document, WebFeature.kDOMClobberedNotShadowedFormPropertyAccessed));

    const form = document.createElement("form");
    assert_equals(form.somethingRandom, undefined);

    assert_false(internals.isUseCounted(document, WebFeature.kDOMClobberedNotShadowedFormPropertyAccessed));
    assert_false(internals.isUseCounted(document, WebFeature.kDOMClobberedShadowedFormPropertyAccessed));
}, 'Non-existing property should not be use-counted');


</script>