File: scroll-start-root.tentative.html

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<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <title> CSS Scroll Snap 2 Test: scroll-start-*</title>
  <link rel="help" href="https://drafts.csswg.org/css-scroll-snap-2/#scroll-start">
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
</head>

<body>
  <style>
    :root {
      scroll-start: 10vh 200px;
    }

    .spacer {
      width: 200vw;
      height: 200vh;
      border: solid 1px green;
    }
  </style>
  <div class="spacer"></div>
  <script>
    promise_test(async (t) => {
      assert_equals(window.scrollX, 200,
        "scroll-start: <length> sets initial scroll position");
      assert_equals(window.scrollY, 0.1 * window.innerHeight,
        "scroll-start: <length> sets initial scroll position");
    }, "scroll-start sets the initial scroll position of the document");
  </script>
</body>