<!doctype html>
<title>Table parts sticky containers</title>
<script src='/resources/testharness.js'></script>
<script src='/resources/testharnessreport.js'></script>
<link rel="author" title="Aleks Totic" href="mailto:atotic@chromium.org" />
<link rel="help" href="https://www.w3.org/TR/css-tables-3/" />
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/5020"/>
<style>
  body {
    margin: 0;
  }
  main * {
    box-sizing: border-box;
  }

  main .scroller {
    width: 350px;
    height: 302px;
    overflow-y: scroll;
    outline-offset: -1px;
    outline: gray solid 1px;
  }
  main .padblock {
    width: 300px;
    height: 400px;
    outline-offset: -2px;
    outline: black dotted 2px;
  }
  main table {
    border-spacing: 0;
  }

  main td {
    width: 100px;
    height: 25px;
  }
  .sticky {
    position:sticky;
    top: 0;
    background: rgba(0,255,0, 0.3);
  }

</style>
<main>
  <div class="scroller">
    <div class="padblock">top</div>
    <table>
      <thead>
        <tr>
          <td>h:0,0</td>
          <td>h:0,1</td>
          <td>h:0,2</td>
        </tr>
        <tr >
          <td>h:1,0</td>
          <td >h:1,1</td>
          <td>h:1,2</td>
        </tr>
        <tr>
          <td>h:2,0</td>
          <td>h:2,1</td>
          <td>h:2,2</td>
        </tr>
      </thead>
      <tbody>
        <tr>
          <td>b:0,0</td>
          <td>b:0,1</td>
          <td>b:0,2</td>
        </tr>
        <tr>
          <td>b:1,0</td>
          <td>b:1,1</td>
          <td>b:1,2</td>
        </tr>
        <tr>
          <td>b:2,0</td>
          <td>b:2,1</td>
          <td>b:2,2</td>
        </tr>
      </tbody>
      <tfoot>
        <tr>
          <td>f:0,0</td>
          <td>f:0,1</td>
          <td>f:0,2</td>
        </tr>
        <tr>
          <td>f:1,0</td>
          <td>f:1,1</td>
          <td>f:1,2</td>
        </tr>
        <tr>
          <td>f:2,0</td>
          <td>f:2,1</td>
          <td>f:2,2</td>
        </tr>
      </tfoot>
    </table>
    <div class="padblock">bottom</div>
  </div>
</main>
<script>

  function scrollTo(y) {
    let scroller = document.querySelector("main .scroller");
    scroller.scrollTop = y;
  }

  test( () => {
    // Setup
    let target = document.querySelector("main tbody tr:nth-child(2) td:nth-child(2)");
    let scroller = document.querySelector("main .scroller");
    target.classList.toggle("sticky");

    // Tests
    scrollTo(0);
    assert_equals(target.getBoundingClientRect().top, 500, "intrinsic position");

    scrollTo(600);
    assert_equals(target.getBoundingClientRect().top, 0, "sticking to the table");

    scrollTo(640);
    assert_equals(target.getBoundingClientRect().top, -40, "sticking to the table bottom");

    // Teardown
    target.classList.toggle("sticky");
  }, "TD sticky container is table");

  test( () => {
    // Setup
    let target = document.querySelector("main tbody tr:nth-child(2)");
    let scroller = document.querySelector("main .scroller");
    target.classList.toggle("sticky");

    // Tests
    scrollTo(0);
    assert_equals(target.getBoundingClientRect().top, 500, "intrinsic position");

    scrollTo(600);
    assert_equals(target.getBoundingClientRect().top, 0, "sticking to the table");

    scrollTo(640);
    assert_equals(target.getBoundingClientRect().top, -40, "sticking to the table bottom");
    // Teardown
    target.classList.toggle("sticky");
  }, "TR sticky container is table");


  test( () => {
    // Setup
    let target = document.querySelector("main tbody");
    let scroller = document.querySelector("main .scroller");
    target.classList.toggle("sticky");

    // Tests
    scrollTo(0);
    assert_equals(target.getBoundingClientRect().top, 475, "intrinsic position");

    scrollTo(550);
    assert_equals(target.getBoundingClientRect().top, 0, "sticking to the table");

    scrollTo(600);
    assert_equals(target.getBoundingClientRect().top, -50, "sticking to the table bottom");

    // Teardown
    target.classList.toggle("sticky");
  }, "TBODY sticky container is table");

</script>
