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<!DOCTYPE html>
<title>preventDefault during activation behavior</title>
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1197032">
<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-button-element">
<link rel="help" href="https://dom.spec.whatwg.org/#dispatching-events">
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Google" href="http://www.google.com/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<form id="f">
<input type="submit" id="b">
</form>
<script>
promise_test(async () => {
let form = document.getElementById("f");
let button = document.getElementById("b");
let cached_event;
let submit_fired = false;
let click_promise = new Promise((resolve, reject) => {
button.addEventListener("click", event => {
assert_false(submit_fired);
cached_event = event;
resolve();
});
});
form.addEventListener("submit", event => {
assert_false(submit_fired);
assert_true(!!cached_event, "click should have fired");
// Call preventDefault on the click event during its activation
// behavior, to test the bug that we're trying to test.
cached_event.preventDefault();
// prevent the form submission from navigating the page
event.preventDefault();
submit_fired = true;
});
assert_false(submit_fired);
button.click();
await click_promise;
assert_true(submit_fired);
}, "behavior of preventDefault during activation behavior");
</script>
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