1 files changed, 50 insertions, 0 deletions
diff --git a/testing/web-platform/tests/speculation-rules/prerender/restriction-window-resize.html b/testing/web-platform/tests/speculation-rules/prerender/restriction-window-resize.html
new file mode 100644
index 0000000000..20a71b4bdb
--- /dev/null
+++ b/testing/web-platform/tests/speculation-rules/prerender/restriction-window-resize.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<meta name="timeout" content="long">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<script src="resources/utils.js"></script>
+<body>
+<script>
+
+setup(() => assertSpeculationRulesIsSupported());
+
+// ResizeTo and ResizeBy operations should be ignored.
+// See https://github.com/jeremyroman/alternate-loading-modes/issues/73.
+['resizeTo', 'resizeBy'].forEach(resizeFunc => {
+  promise_test(
+      async t => {
+        const uid = token();
+        const bc = new PrerenderChannel('test-channel', uid);
+        t.add_cleanup(_ => bc.close());
+
+        const gotMessage = new Promise(resolve => {
+          bc.addEventListener('message', e => {
+            resolve(e.data);
+          }, {once: true});
+        });
+
+        const url = `resources/window-resize.html?resize=${resizeFunc}&uid=${uid}`;
+
+        // We have to open a new window to run the test, since a window that was
+        // not created by window.open() cannot be resized.
+        window.open(
+            url, '_blank',
+            `width=${window.screen.availWidth / 2},height=${
+                window.screen.availHeight / 2},noopener`);
+
+        const result = await gotMessage;
+        assert_equals(result.status, 'PASS');
+        assert_equals(
+            result.prevRect.width, result.newRect.width,
+            'width for prerendering');
+        assert_equals(
+            result.prevRect.height, result.newRect.height,
+            'height for prerendering');
+      },
+      `a prerendering page cannot resize its window by executing ${
+          resizeFunc}.`);
+});
+
+</script>
+</body>