1 files changed, 48 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_allow_downloads.tentative.html b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_allow_downloads.tentative.html
new file mode 100644
index 0000000000..26b8b393ab
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_allow_downloads.tentative.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>&lt;a download&gt; triggered download in sandbox is allowed by allow-downloads.</title>
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#attr-iframe-sandbox">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#the-iframe-element">
+<script src="/common/utils.js"></script>
+<script src="/resources/testharness.js"></script>
+<script src='/resources/testharnessreport.js'></script>
+<script src="support/iframe_sandbox_download_helper.js"></script>
+<body>
+<script>
+"use strict";
+
+const attributes_list = [
+  '',
+  'target="_blank"',
+  'target="_blank" rel="noopener"',
+];
+
+const download_flags = [false, true];
+
+attributes_list.forEach(attributes =>
+  download_flags.forEach(download_flag =>
+    async_test(t => {
+      const download_token = token();
+      let iframe = document.createElement("iframe");
+      iframe.srcdoc = `<a ${attributes}>Download</a>`;
+      iframe.sandbox = "allow-same-origin allow-popups allow-downloads";
+      iframe.addEventListener('load', t.step_func(function () {
+        if (attributes !== '' || download_flag) {
+          // Specifiying `download` or a `target` should not trigger a
+          // navigation in this iframe.
+          iframe.contentWindow.addEventListener(
+            "unload", t.unreached_func("Unexpected navigation."));
+        }
+        let anchor = iframe.contentDocument.getElementsByTagName('a')[0];
+        anchor.href = "support/download_stash.py?token=" + download_token;
+        if (download_flag) anchor.download = null;
+        anchor.click();
+        AssertDownloadSuccess(t, download_token, DownloadVerifyDelay());
+      }), { once: true });
+
+      document.body.appendChild(iframe);
+    }, `<a ${attributes} ${download_flag ? "download" : ""}> triggered ` +
+               `download in sandbox is allowed by allow-downloads.`)));
+
+</script>
+</body>