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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link rel=help href="https://drafts.csswg.org/css-scroll-snap-2/#snapevent-interface">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<script>
test(function() {
assert_throws_js(TypeError, function() {
new SnapEvent();
}, 'First argument (type) is required, so was expecting a TypeError.');
}, 'Missing type argument');
test(function() {
let event = new SnapEvent("");
assert_true(event instanceof window.SnapEvent);
}, "the event is an instance of SnapEvent");
test(function() {
let event = new SnapEvent("customsnapevent");
assert_equals(event.type, "customsnapevent",
"event constructor type is honored");
assert_equals(event.snapTargetBlock, null, "null snapTrgetBlock");
assert_equals(event.snapTargetInline, null, "null snapTargetInline");
}, "default init dict");
test(function() {
const div_element = document.createElement("div");
let event = new SnapEvent("scrollsnapchange", {
snapTargetBlock: document,
snapTargetInline: div_element
});
assert_equals(event.type, "scrollsnapchange");
assert_equals(event.snapTargetBlock, document);
assert_equals(event.snapTargetInline, div_element);
}, "event constructor type is honored");
</script>
</body>
</html>
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