snapevent-constructor.html

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This test has a WPT meta file that expects 4 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /css/css-scroll-snap/snapevent-constructor.html - WPT Dashboard Interop Dashboard

<!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>