File: custom-element-exception.html

package info (click to toggle)
firefox-esr 128.14.0esr-1~deb13u1
  • links: PTS, VCS
  • area: main
  • in suites: trixie
  • size: 4,230,204 kB
  • sloc: cpp: 7,104,278; javascript: 6,088,450; ansic: 3,654,017; python: 1,212,326; xml: 594,604; asm: 420,652; java: 182,969; sh: 71,124; makefile: 20,747; perl: 13,449; objc: 12,399; yacc: 4,583; cs: 3,846; pascal: 2,973; lex: 1,720; ruby: 1,194; exp: 762; php: 436; lisp: 258; awk: 247; sql: 66; sed: 54; csh: 10
file content (31 lines) | stat: -rw-r--r-- 1,034 bytes parent folder | download | duplicates (28) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
 
<!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>