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chromium/third_party/blink/web_tests/fast/css/usecounter-cascaded-zoom.html 

<!DOCTYPE html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<style id="style">
  *    { zoom: 1; }
  body { zoom: 100%; }
</style>
<body>
<script>
'use strict';

test(() => {
    let kCSSZoomNotEqualToOne = 691;
    let kCascadedCSSZoomNotEqualToOne = 3578;

    // Force a cascade
    getComputedStyle(document.body);
    assert_false(internals.isUseCounted(document, kCSSZoomNotEqualToOne));
    assert_false(internals.isUseCounted(document, kCascadedCSSZoomNotEqualToOne));
    let style = document.getElementById('style');
    style.textContent = "* { zoom: 2; }"
    assert_equals(getComputedStyle(document.body).zoom, "2");
    assert_true(internals.isUseCounted(document, kCSSZoomNotEqualToOne));
    assert_true(internals.isUseCounted(document, kCascadedCSSZoomNotEqualToOne));
}, 'CSS `zoom` property use counted for parsing and cascade.');
</script>