| <!doctype html> |
| <meta charset=utf-8> |
| <title>Deletion of WindowProxy's indexed properties is not cached</title> |
| <link rel="help" href="https://html.spec.whatwg.org/multipage/window-object.html#windowproxy-delete"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <div id=log></div> |
| <script> |
| const iframe = document.createElement("iframe"); |
| iframe.srcdoc = ""; |
| |
| test(() => { |
| assert_equals(window.length, 0); |
| for (let i = 0; i < 1e5; i++) { |
| assert_true(delete window[0]); |
| } |
| |
| document.body.append(iframe); |
| assert_false(delete window[0]); |
| }, "Absence of index '0' is not cached"); |
| |
| test(() => { |
| assert_equals(window.length, 1); |
| for (let i = 0; i < 1e5; i++) { |
| assert_false(delete window[0]); |
| } |
| |
| iframe.remove(); |
| assert_true(delete window[0]); |
| }, "Presence of index '0' is not cached"); |
| </script> |
