File: custom-element-exception.html

package info (click to toggle)
firefox-esr 78.15.0esr-1~deb11u1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 3,301,156 kB
  • sloc: cpp: 5,665,905; javascript: 4,798,386; ansic: 2,878,233; python: 977,004; asm: 270,347; xml: 181,456; java: 111,756; sh: 72,926; makefile: 21,819; perl: 13,380; cs: 4,725; yacc: 4,565; objc: 3,026; pascal: 1,787; lex: 1,720; ada: 1,681; exp: 505; php: 436; lisp: 260; awk: 152; ruby: 103; csh: 80; sed: 53; sql: 45
file content (31 lines) | stat: -rw-r--r-- 1,034 bytes parent folder | download | duplicates (27) 
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>