| <!DOCTYPE HTML> |
| <meta charset=utf-8> |
| <title>IntersectionObserver: callback arguments</title> |
| <link rel="help" href="https://w3c.github.io/IntersectionObserver/#notify-intersection-observers-algo"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <div id="log"></div> |
| <script> |
| "use strict"; |
| |
| async_test(t => { |
| const io = new IntersectionObserver(function(entries, observer) { |
| t.step(() => { |
| assert_equals(this, io); |
| assert_equals(arguments.length, 2); |
| assert_true(Array.isArray(entries)); |
| assert_equals(entries.length, 1); |
| assert_true(entries[0] instanceof IntersectionObserverEntry); |
| assert_equals(observer, io); |
| |
| io.disconnect(); |
| t.done(); |
| }); |
| }); |
| |
| io.observe(document.body); |
| }, "Callback is invoked with |this| value of IntersectionObserver and two arguments"); |
| </script> |
