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chromium/third_party/blink/web_tests/wpt_internal/dom-clobbering/document.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:
// - kDOMClobberedShadowedDocumentPropertyAccessed
// - kDOMClobberedNotShadowedDocumentPropertyAccessed

test(() => {
    internals.clearUseCounter(document, WebFeature.kDOMClobberedShadowedDocumentPropertyAccessed);
    internals.clearUseCounter(document, WebFeature.kDOMClobberedNotShadowedDocumentPropertyAccessed);
    assert_false(internals.isUseCounted(document, WebFeature.kDOMClobberedShadowedDocumentPropertyAccessed));
    assert_false(internals.isUseCounted(document, WebFeature.kDOMClobberedNotShadowedDocumentPropertyAccessed));

    // Check elements clobberable via name
    const img = document.createElement("img");
    img.name = "test1234";
    document.body.append(img);

    // Check if the property is actually clobbered, and this should also
    // trigger the use counter.
    assert_equals(document.test1234, img);

    assert_true(internals.isUseCounted(document,WebFeature.kDOMClobberedNotShadowedDocumentPropertyAccessed));
    assert_false(internals.isUseCounted(document, WebFeature.kDOMClobberedShadowedDocumentPropertyAccessed));


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

test(() => {
    internals.clearUseCounter(document, WebFeature.kDOMClobberedShadowedDocumentPropertyAccessed);
    internals.clearUseCounter(document, WebFeature.kDOMClobberedNotShadowedDocumentPropertyAccessed);
    assert_false(internals.isUseCounted(document, WebFeature.kDOMClobberedShadowedDocumentPropertyAccessed));
    assert_false(internals.isUseCounted(document, WebFeature.kDOMClobberedNotShadowedDocumentPropertyAccessed));

    const img = document.createElement("img");
    img.name = "getElementById";
    document.body.append(img);

    // Check if the property is actually clobbered, and this should also
    // trigger the use counter.
    assert_equals(document.getElementById, img);

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

test(() => {
    internals.clearUseCounter(document, WebFeature.kDOMClobberedShadowedDocumentPropertyAccessed);
    internals.clearUseCounter(document, WebFeature.kDOMClobberedNotShadowedDocumentPropertyAccessed);
    assert_false(internals.isUseCounted(document, WebFeature.kDOMClobberedShadowedDocumentPropertyAccessed));
    assert_false(internals.isUseCounted(document, WebFeature.kDOMClobberedNotShadowedDocumentPropertyAccessed));


    assert_equals(document.someRandomProperty, undefined);

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


</script>