wpt / css / css-sizing / stretch / stretch-inline-size-001.html

Status: FAIL | Duration: 83ms | Subtests: 28/46 | Open test on wpt.live | wpt.fyi

TestTest SourceSubtests (28/46)

Data from commit:
a50cb89 wpt: run reference-named files which are themselves tests (#836) (2026-09-03)

SubtestStatusMessage
[data-expected-width] 1PASS
[data-expected-width] 2FAILassert_equals: <canvas class="test" data-expected-width="45" /> width expected 45 but got 50
[data-expected-width] 3FAILassert_equals: <input class="test" data-expected-width="45" /> width expected 45 but got 60
[data-expected-width] 4FAILassert_equals: <textarea class="test" data-expected-width="45" /> width expected 45 but got 310
[data-expected-width] 5FAILassert_equals: <button class="test" data-expected-width="45" /> width expected 45 but got 10
[data-expected-width] 6PASS
[data-expected-width] 7PASS
[data-expected-width] 8FAILassert_equals: <div class="test" style="position: absolute" data-expected-width="50" /> width expected 50 but got 55
[data-expected-width] 9PASS
[data-expected-width] 10PASS
[data-expected-width] 11PASS
[data-expected-width] 12PASS
[data-expected-width] 13PASS
[data-expected-width] 14PASS
[data-expected-width] 15FAILassert_equals: <div class="test" style="position: absolute; inset-inline-start: 10px" data-expected-width="45" /> width expected 45 but got 55
[data-expected-width] 16FAILassert_equals: <div class="test" style="position: absolute; inset-inline-end: 10px" data-expected-width="45" /> width expected 45 but got 55
[data-expected-width] 17FAILassert_equals: <div class="test" style="position: absolute; inset-inline-end: 55px" data-expected-width="10" /> width expected 10 but got 55
[data-expected-width] 18FAILassert_equals: <div class="test" style="position: absolute; inset-inline-start: 55px" data-expected-width="10" /> width expected 10 but got 55
[data-expected-width] 19PASS
[data-expected-width] 20PASS
[data-expected-width] 21PASS
[data-expected-width] 22PASS
[data-expected-width] 23PASS
[data-expected-width] 24PASS
[data-expected-width] 25FAILassert_equals: <canvas class="test" data-expected-width="45" style="box-sizing: border-box;" /> width expected 45 but got 30
[data-expected-width] 26FAILassert_equals: <input class="test" data-expected-width="45" style="box-sizing: border-box;" /> width expected 45 but got 60
[data-expected-width] 27FAILassert_equals: <textarea class="test" data-expected-width="45" style="box-sizing: border-box;" /> width expected 45 but got 310
[data-expected-width] 28FAILassert_equals: <button class="test" data-expected-width="45" style="box-sizing: border-box;" /> width expected 45 but got 10
[data-expected-width] 29PASS
[data-expected-width] 30PASS
[data-expected-width] 31FAILassert_equals: <div class="test" style="position: absolute; box-sizing: border-box;" data-expected-width="50" /> width expected 50 but got 55
[data-expected-width] 32PASS
[data-expected-width] 33PASS
[data-expected-width] 34PASS
[data-expected-width] 35PASS
[data-expected-width] 36PASS
[data-expected-width] 37PASS
[data-expected-width] 38FAILassert_equals: <div class="test" style="position: absolute; inset-inline-start: 10px; box-sizing: border-box;" data-expected-width="45" /> width expected 45 but got 55
[data-expected-width] 39FAILassert_equals: <div class="test" style="position: absolute; inset-inline-end: 10px; box-sizing: border-box;" data-expected-width="45" /> width expected 45 but got 55
[data-expected-width] 40FAILassert_equals: <div class="test" style="position: absolute; inset-inline-end: 55px; box-sizing: border-box;" data-expected-width="10" /> width expected 10 but got 55
[data-expected-width] 41FAILassert_equals: <div class="test" style="position: absolute; inset-inline-start: 55px; box-sizing: border-box;" data-expected-width="10" /> width expected 10 but got 55
[data-expected-width] 42PASS
[data-expected-width] 43PASS
[data-expected-width] 44PASS
[data-expected-width] 45PASS
[data-expected-width] 46PASS

/css/css-sizing/stretch/stretch-inline-size-001.html

<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#sizing-values">
<link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<meta name="assert"
  content="inline-size:stretch (setting 'width' in this case) causes an element's content-box to be sized such that its margin-box-size will fill the containing block's content-box.">
<style>
  .cb {
    inline-size: 50px;
    block-size: 40px;

    /* This margin & border are purely cosmetic and don't impact the sizing
     * calculations in this test: */
    margin: 5px;
    border: 2px solid black;

    /* This padding only comes into play for the subtests with absolutely
     * positioned children (where our padding-box forms the containing block
     * for the abspos child). */
    padding-inline: 5px;
    padding-block: 3px;

    /* We make each containing block an inline-level box, so we can display
     * subtests in multiple rows, for easier visualization: */
    display: inline-block;
    vertical-align: top;
  }

  .test {
    /* We have 2+3 = 5px of margin in the inline axis. This means the stretched
     * children should all have a border-box size that's 5px less than the
     * containing block's content-box size, i.e. 50 - 5 = 45px. */
    margin-inline-start: 2px;
    margin-inline-end: 3px;

    /* We also have some border/padding that UAs will need to account for
     * when computing the stretched children's content-box sizes; but these
     * don't reduce our `data-expected-width` expectations, since those
     * correspond to the border-box size. */
    border: 3px solid blue;
    padding: 2px;

    inline-size: stretch;
    block-size: 20px;
    background: fuchsia;
  }
</style>
<script>
  function runTests() {
    checkLayout('[data-expected-width]');

    // Add box-sizing:border-box (which shouldn't impact the actual resolved
    // box sizes that 'stretch' produces), and retest:
    for (let elem of document.querySelectorAll(".test")) {
      elem.style.boxSizing = "border-box";
    }
    checkLayout('[data-expected-width]');
  }
</script>
<body onload="runTests()">
  <!-- 'stretch' on a block box, replaced element, form controls, float: -->
  <div class="cb">
    <div class="test" data-expected-width="45"></div>
  </div>
  <div class="cb">
    <canvas class="test" data-expected-width="45"></canvas>
  </div>
  <div class="cb">
    <input class="test" data-expected-width="45">
  </div>
  <div class="cb">
    <textarea class="test" data-expected-width="45"></textarea>
  </div>
  <div class="cb">
    <button class="test" data-expected-width="45"></button>
  </div>
  <div class="cb">
    <div class="test" style="float: left" data-expected-width="45"></div>
  </div>

  <br>

  <!-- 'stretch' on various abspos configurations, which use the container's
        padding-box as the area-to-fill (which in this case is 10px larger than
        the container's content-box, hence the larger 'data-expected-*'
        values vs. the previous subtests). -->
  <!-- With 0 insets, the child's margin-box fills the CB's padding-box, so
       the child's border-box should end being
       cb-padding-box-size - child-margin-size = 60px - 5px = 55px -->
  <div class="cb" style="position: relative">
    <div class="test" style="position: absolute; inset-inline: 0;"
         data-expected-width="55"></div>
  </div>

  <!-- With auto insets, the child is placed at its static position which is
       the origin of the CB's content-box, and then 'stretch' makes it extend
       to reach the far end of the CB's padding-box. So it should be as large
       as the zero-insets case above, minus the CB's inline-start-padding
       which is 5px. -->
  <div class="cb" style="position: relative">
    <div class="test" style="position: absolute" data-expected-width="50"></div>
  </div>

  <!-- When we specify an inset, the child should be as large as the
       zero-insets case above, minus whatever nonzero inset we choose. -->
  <div class="cb" style="position: relative">
    <div class="test" style="position: absolute; inset-inline-start: 10px"
         data-expected-width="45"></div>
  </div>
  <div class="cb" style="position: relative">
    <div class="test" style="position: absolute; inset-inline-end: 10px"
         data-expected-width="45"></div>
  </div>

  <!-- If an inset pushes the child past the edge of the CB, 'stretch' shrinks
       to just the 10px needed for the child's border/padding: -->
  <div class="cb" style="position: relative">
    <div class="test" style="position: absolute; inset-inline-end: 55px"
         data-expected-width="10"></div>
  </div>
  <div class="cb" style="position: relative">
    <div class="test" style="position: absolute; inset-inline-start: 55px"
         data-expected-width="10"></div>
  </div>

  <br>

  <!-- 'stretch' on various abspos configurations in a grid: similar to
       above, but the grid area forms the containing block. -->
  <!-- Similar to zero insets case above, but just now in a grid: -->
  <div class="cb"
       style="display: inline-grid; position: relative">
    <div class="test"
         style="position: absolute; inset-inline: 0;"
         data-expected-width="55"></div>
  </div>

  <!-- With no insets, we're placed at our static position which is the grid's
       padding-box origin, and then we stretch to reach the far end of its
       padding-box. So we should be as large as the zero-insets case above. -->
  <div class="cb"
       style="display: inline-grid; position: relative">
    <div class="test"
         style="position: absolute"
         data-expected-width="55"></div>
  </div>

  <!-- When we specify an inset, the child should be as large as the
       zero-insets case above, minus whatever nonzero inset we choose. -->
  <div class="cb"
       style="display: inline-grid; position: relative">
    <div class="test"
         style="position: absolute; inset-inline-start: 10px"
         data-expected-width="45"></div>
  </div>
  <div class="cb"
       style="display: inline-grid; position: relative">
    <div class="test"
         style="position: absolute; inset-inline-end: 10px"
         data-expected-width="45"></div>
  </div>

  <!-- If an inset pushes the child past the edge of the CB, 'stretch' shrinks
       to just the 10px needed for the child's border/padding: -->
  <div class="cb"
       style="display: inline-grid; position: relative">
    <div class="test"
         style="position: absolute; inset-inline-end: 55px"
         data-expected-width="10"></div>
  </div>
  <div class="cb"
       style="display: inline-grid; position: relative">
    <div class="test"
         style="position: absolute; inset-inline-start: 55px"
         data-expected-width="10"></div>
  </div>

  <br>

  <!-- 'stretch' on a flex item: -->
  <div class="cb" style="display: inline-flex; flex-direction: row">
    <div class="test" data-expected-width="45"></div>
  </div>
  <div class="cb" style="display: inline-flex; flex-direction: column">
    <div class="test" data-expected-width="45"></div>
  </div>
  <!--...now with an extra-large sibling sharing the child's flex line, to be
      sure our 'stretch' sizing value resolves against the flex line's size: -->
  <div class="cb" style="display: inline-flex; flex-flow: column wrap">
    <div class="test" data-expected-width="55"></div>
    <div style="inline-size: 60px"></div>
  </div>

  <!-- 'stretch' on a grid item in a definite-size grid track: -->
  <div class="cb" style="display: inline-grid; grid-template-columns: 35px">
    <div class="test" data-expected-width="30"></div>
  </div>

  <!-- 'stretch' on a grid item in an automatically-sized grid track: -->
  <div class="cb" style="display: inline-grid">
    <div class="test" data-expected-width="45"></div>
  </div>
</body>