File: animation-trigger-range-px-roundtrip.tentative.html

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<!DOCTYPE html>
<html>
  <head>
    <link rel="help" src="https://drafts.csswg.org/css-animations-2/#animation-trigger">
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
  </head>
  <body>
    <div id="subject"></div>
    <script>
      // This test is aimed at environments where the device scale factor is not
      // 1, i.e. the ratio of physical pixels to CSS pixels isn't 1.
      promise_test(async (test) => {
        let trigger = new AnimationTrigger({
          behavior: "alternate",
          timeline: new ViewTimeline({
            subject: document.getElementById('subject'), axis: "y"
          }),
          rangeStart: "100px",
          rangeEnd: "300px"
        });

        assert_equals(trigger.rangeStart, "100px",
          "correct range start returned");
        assert_equals(trigger.rangeEnd, "300px", "correct range end returned");
      },  "Ranges of triggers created by script are read in CSS pixels");
    </script>
  </body>
</html>