1 files changed, 31 insertions, 0 deletions
diff --git a/testing/web-platform/tests/loading/early-hints/iframe-pdf.h2.window.js b/testing/web-platform/tests/loading/early-hints/iframe-pdf.h2.window.js
new file mode 100644
index 0000000000..11c1443c34
--- /dev/null
+++ b/testing/web-platform/tests/loading/early-hints/iframe-pdf.h2.window.js
@@ -0,0 +1,31 @@
+// META: script=/common/utils.js
+// META: script=resources/early-hints-helpers.sub.js
+
+promise_test(async (t) => {
+    if (!navigator.pdfViewerEnabled) {
+        return;
+    }
+
+    const iframe = document.createElement("iframe");
+    const resource_url = SAME_ORIGIN_RESOURCES_URL + "/empty.js?" + token();
+    const promise = new Promise((resolve) => {
+        const params = new URLSearchParams();
+        params.set("resource-url", resource_url);
+        params.set("token", token());
+        const iframe_url = SAME_ORIGIN_RESOURCES_URL + "/pdf-with-early-hints.h2.py?" + params.toString();
+
+        iframe.src = iframe_url;
+        iframe.onload = resolve;
+        document.body.appendChild(iframe);
+    });
+    await promise;
+
+    // `iframe` should not preload the hinted resource.
+    const iframe_entries = iframe.contentWindow.performance.getEntriesByName(resource_url);
+    assert_equals(iframe_entries.length, 0);
+
+    await fetchScript(resource_url);
+    const entries = performance.getEntriesByName(resource_url);
+    assert_equals(entries.length, 1);
+    assert_not_equals(entries[0].transferSize, 0);
+}, "Early hints for an iframe of which content is pdf should be ignored.");