window-indexed-properties-delete-no-cache.html (909B)
1 <!doctype html> 2 <meta charset=utf-8> 3 <meta name=timeout content=long> 4 <title>Deletion of WindowProxy's indexed properties is not cached</title> 5 <link rel="help" href="https://html.spec.whatwg.org/multipage/window-object.html#windowproxy-delete"> 6 <script src="/resources/testharness.js"></script> 7 <script src="/resources/testharnessreport.js"></script> 8 <div id=log></div> 9 <script> 10 const iframe = document.createElement("iframe"); 11 iframe.srcdoc = ""; 12 13 test(() => { 14 assert_equals(window.length, 0); 15 for (let i = 0; i < 1e5; i++) { 16 assert_true(delete window[0]); 17 } 18 19 document.body.append(iframe); 20 assert_false(delete window[0]); 21 }, "Absence of index '0' is not cached"); 22 23 test(() => { 24 assert_equals(window.length, 1); 25 for (let i = 0; i < 1e5; i++) { 26 assert_false(delete window[0]); 27 } 28 29 iframe.remove(); 30 assert_true(delete window[0]); 31 }, "Presence of index '0' is not cached"); 32 </script>