wpt/css/css-scroll-snap/snapevent-constructor.html at d21c840774fb3a7cad8ec9657ec07c800293295f · web-platform-tests/wpt · GitHub

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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>