| <!DOCTYPE html> |
| <title>Handling of exceptions in custom element constructors</title> |
| |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script> |
| setup({allow_uncaught_exception: true}); |
| |
| window.log = []; |
| window.addEventListener("error", ev => log.push(ev.error)); |
| |
| const test_load = async_test( |
| "Test that exceptions from the constructor of a custom element " + |
| "inside a module are propagated as expected.\n"); |
| window.addEventListener("load", test_load.step_func_done(ev => { |
| assert_equals(1, log.length); |
| const exception = log[0]; |
| assert_true(exception instanceof Error); |
| assert_equals(exception.message, "custom element error"); |
| })); |
| </script> |
| <script type="module"> |
| class XThrower extends HTMLElement { |
| constructor() { |
| super(); |
| throw new Error("custom element error"); |
| } |
| } |
| customElements.define("x-thrower", XThrower); |
| document.createElement("x-thrower"); |
| </script> |
