css/css-flexbox/abspos/position-absolute-013.html

<!DOCTYPE html>
<title>CSS Test: Absolutely positioned children of flexboxes</title>
<link rel="author" title="Google Inc." href="http://www.google.com/">
<link rel="help" href="https://drafts.csswg.org/css-flexbox/#abspos-items">
<meta name="assert" content="Checks the abspos position of flex children in a number of writing modes, alignments, etc.">
<style>
.abspos {
  height: 50px;
  width: 50px;
  background: lightblue;
  position: absolute;
  flex: none;
}

.relpos {
  position: relative;
}

.title {
    margin-top: 1em;
}

.flexbox {
    display: flex;
    background-color: #aaa;
    height: 100px;
    width: 100px;
}

.horizontal-tb {
    writing-mode: horizontal-tb;
}
.vertical-rl {
    writing-mode: vertical-rl;
}
.vertical-lr {
    writing-mode: vertical-lr;
}

.rtl {
    direction: rtl;
}
.ltr {
    direction: ltr;
}

.align-items-flex-start {
    align-items: flex-start;
}
.align-items-flex-end {
    align-items: flex-end;
}
.align-items-stretch {
    align-items: stretch;
}
.justify-content-flex-start {
    justify-content: flex-start;
}
.justify-content-flex-end {
    justify-content: flex-end;
}

.row {
    flex-direction: row;
}
.row-reverse {
    flex-direction: row-reverse;
}
.column {
    flex-direction: column;
}
.column-reverse {
    flex-direction: column-reverse;
}

.nowrap {
    flex-wrap: nowrap;
}
.wrap {
    flex-wrap: wrap;
}
.wrap-reverse {
    flex-wrap: wrap-reverse;
}

</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<body onload="checkLayout('.flexbox')">
<div id=log></div>
<script>

var writingModes = ['horizontal-tb', 'vertical-rl', 'vertical-lr'];
var directions = ['ltr', 'rtl'];
var justifyContents = ['flex-start', 'flex-end'];
var alignItems = ['flex-start', 'flex-end', 'stretch'];
var flexDirections = ['row', 'column', 'row-reverse', 'column-reverse'];
var wraps = ['nowrap', 'wrap', 'wrap-reverse'];

// These expected values were harvested from Chrome 85. Firefox 78b6 agrees
// except when align-items:stretch and flex-wrap:wrap-reverse are both in
// effect.
// Chrome 83 and FF 78b6 agree with these values when the lone flex child is
// position:static instead of position:absolute. That is evidence that these
// values are all correct, because the position of a staticpos child is
// specified to be identical to the abspos position when there are no other
// children or specified offsets.
var x = [0,0,0,50,50,50,50,50,50,0,0,0,0,50,0,0,50,0,50,0,50,50,0,50,50,50,50,0,0,0,0,0,0,50,50,50,0,50,0,0,50,0,50,0,50,50,0,50,0,0,0,50,50,50,50,50,50,0,0,0,0,50,0,0,50,0,50,0,50,50,0,50,50,50,50,0,0,0,0,0,0,50,50,50,0,50,0,0,50,0,50,0,50,50,0,50,0,0,0,50,50,50,50,50,50,0,0,0,50,0,50,50,0,50,0,50,0,0,50,0,50,50,50,0,0,0,0,0,0,50,50,50,50,0,50,50,0,50,0,50,0,0,50,0,50,0,50,50,0,50,50,0,50,50,0,50,50,50,50,0,0,0,50,50,50,0,0,0,50,0,50,50,0,50,50,0,50,50,0,50,0,0,0,50,50,50,0,0,0,50,50,50,50,0,50,50,0,50,50,0,50,50,0,50,50,50,50,0,0,0,50,50,50,0,0,0,50,0,50,50,0,50,50,0,50,50,0,50,0,0,0,50,50,50,0,0,0,50,50,50,0,50,0,0,50,0,0,50,0,0,50,0,50,50,50,0,0,0,50,50,50,0,0,0,0,50,0,0,50,0,0,50,0,0,50,0,0,0,0,50,50,50,0,0,0,50,50,50,0,50,0,0,50,0,0,50,0,0,50,0,0,0,0,50,50,50,0,0,0,50,50,50,0,50,0,0,50,0,0,50,0,0,50,0,50,50,50,0,0,0,50,50,50,0,0,0,0,50,0,0,50,0,0,50,0,0,50,0,0,0,0,50,50,50,0,0,0,50,50,50,0,50,0,0,50,0,0,50,0,0,50,0,50,50,50,0,0,0,50,50,50,0,0,0,50,0,50,50,0,50,50,0,50,50,0,50,0,0,0,50,50,50,0,0,0,50,50,50,50,0,50,50,0,50,50,0,50,50,0,50,50,50,50,0,0,0,50,50,50,0,0,0];

var y = [0,50,0,0,50,0,0,50,0,0,50,0,0,0,0,50,50,50,0,0,0,50,50,50,0,50,0,0,50,0,0,50,0,0,50,0,50,50,50,0,0,0,50,50,50,0,0,0,0,50,0,0,50,0,0,50,0,0,50,0,0,0,0,50,50,50,0,0,0,50,50,50,0,50,0,0,50,0,0,50,0,0,50,0,50,50,50,0,0,0,50,50,50,0,0,0,50,0,50,50,0,50,50,0,50,50,0,50,0,0,0,50,50,50,0,0,0,50,50,50,50,0,50,50,0,50,50,0,50,50,0,50,50,50,50,0,0,0,50,50,50,0,0,0,0,0,0,50,50,50,50,50,50,0,0,0,0,50,0,0,50,0,50,0,50,50,0,50,50,50,50,0,0,0,0,0,0,50,50,50,0,50,0,0,50,0,50,0,50,50,0,50,0,0,0,50,50,50,50,50,50,0,0,0,0,50,0,0,50,0,50,0,50,50,0,50,50,50,50,0,0,0,0,0,0,50,50,50,0,50,0,0,50,0,50,0,50,50,0,50,0,0,0,50,50,50,50,50,50,0,0,0,50,0,50,50,0,50,0,50,0,0,50,0,50,50,50,0,0,0,0,0,0,50,50,50,50,0,50,50,0,50,0,50,0,0,50,0,0,0,0,50,50,50,50,50,50,0,0,0,0,50,0,0,50,0,50,0,50,50,0,50,50,50,50,0,0,0,0,0,0,50,50,50,0,50,0,0,50,0,50,0,50,50,0,50,0,0,0,50,50,50,50,50,50,0,0,0,0,50,0,0,50,0,50,0,50,50,0,50,50,50,50,0,0,0,0,0,0,50,50,50,0,50,0,0,50,0,50,0,50,50,0,50,0,0,0,50,50,50,50,50,50,0,0,0,50,0,50,50,0,50,0,50,0,0,50,0,50,50,50,0,0,0,0,0,0,50,50,50,50,0,50,50,0,50,0,50,0,0,50,0];

var test_number = 1;

writingModes.forEach(function(flexWritingMode) {
  wraps.forEach(function(wrap) {
    flexDirections.forEach(function(flexDirection) {
      directions.forEach(function(direction) {
        justifyContents.forEach(function(justifyContent) {
          alignItems.forEach(function(alignment) {
            var flexboxClassName = flexWritingMode + ' ' + direction + ' ' + flexDirection + ' justify-content-' + justifyContent + ' align-items-' + alignment + ' ' + wrap;
            var title = document.createElement('div');
            title.className = 'title';
            title.innerHTML = flexboxClassName + " .flexbox " + (test_number++);
            document.body.appendChild(title);

            var flexbox = document.createElement('div');
            flexbox.className = 'flexbox ' + flexboxClassName;

            var child = document.createElement('div');
            child.setAttribute('class', 'abspos');
            child.setAttribute("data-offset-x", x.shift());
            child.setAttribute("data-offset-y", y.shift());
            flexbox.appendChild(child);

            var relpos = document.createElement('div');
            relpos.className = 'relpos';
            relpos.appendChild(flexbox);

            document.body.appendChild(relpos);
          })
        })
      })
    })
  })
})

// Print the x,y offsets for pasting into above x,y arrays.
absposes = document.querySelectorAll('.abspos')
lefts = Array.from(absposes).map(x => x.offsetLeft)
tops = Array.from(absposes).map(x => x.offsetTop)

</script>
</body>