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diff --git a/testing/web-platform/tests/intersection-observer/intersection-ratio-with-fractional-bounds-2.html b/testing/web-platform/tests/intersection-observer/intersection-ratio-with-fractional-bounds-2.html
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+++ b/testing/web-platform/tests/intersection-observer/intersection-ratio-with-fractional-bounds-2.html
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+<!DOCTYPE html>
+<title>IntersectionObserver ratio with fractional bounds</title>
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1278897">
+<meta name="viewport" content="width=device-width,initial-scale=1">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<style>
+  #container {
+    overflow: hidden;
+    width: 500px;
+  }
+  #target {
+    display: list-item;
+    padding: 16.1px;
+    background: rebeccapurple;
+  }
+</style>
+
+<div id="container">
+  <div id="list">
+    <span id="target"></span>
+  </div>
+</div>
+
+<script>
+async_test(function(t) {
+  let target = document.getElementById("target");
+  let list = document.getElementById("list");
+  let observer = new IntersectionObserver(t.step_func_done(function(entries) {
+    assert_equals(entries.length, 1);
+    assert_equals(entries[0].intersectionRatio, 1);
+    assert_equals(entries[0].isIntersecting, true);
+  }), { root: list, threshold: 1 });
+  observer.observe(target);
+});
+</script>