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-rw-r--r--testing/web-platform/tests/navigation-api/scroll-behavior/after-transition-intercept-handler-modifies.html33
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diff --git a/testing/web-platform/tests/navigation-api/scroll-behavior/after-transition-intercept-handler-modifies.html b/testing/web-platform/tests/navigation-api/scroll-behavior/after-transition-intercept-handler-modifies.html
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index 0000000000..78d1692104
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+++ b/testing/web-platform/tests/navigation-api/scroll-behavior/after-transition-intercept-handler-modifies.html
@@ -0,0 +1,33 @@
+<!doctype html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<div id="main" style="height: 1000px; width: 1000px;"></div>
+<script>
+promise_test(async t => {
+ // Wait for after the load event so that the navigation doesn't get converted
+ // into a replace navigation.
+ await new Promise(resolve => window.onload = () => t.step_timeout(resolve, 0));
+ assert_equals(window.scrollY, 0);
+ window.scrollTo(0, 100);
+ assert_equals(window.scrollY, 100);
+ navigation.onnavigate = e => e.intercept(
+ { scroll: "after-transition",
+ handler: async () => {
+ if (e.navigationType == "push") {
+ // Inserting this <div> should scroll *after* the scroll position
+ // is saved, so that it doesn't break scroll restoration when going
+ // back.
+ let div = document.createElement("div");
+ div.style = "height: 1000px; width: 1000px;";
+ document.body.insertBefore(div, main);
+ }
+ }
+ }
+ );
+ await navigation.navigate("?go").finished;
+ await navigation.back().finished;
+ assert_equals(window.scrollY, 100);
+}, "scroll: state should be saved before intercept handlers run");
+</script>
+</body>