Blitz - WPT: block-axis-constraint-changes-for-out-of-flow-box.html

wpt / css / css-position / block-axis-constraint-changes-for-out-of-flow-box.html

/css/css-position/block-axis-constraint-changes-for-out-of-flow-box.html

<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-position">
<link rel="match" href="block-axis-constraint-changes-for-out-of-flow-box-ref.html">
<meta name="assert" content="top anchored abs pos child moves when containing block border changes.">
<style>
.parent_block {
  position: relative;
  width: 200px;
  height: 100px;
  box-sizing: border-box;
}
.child {
  position: absolute;
  left: 0px;
  width: 50px;
  height: 50px;
  background-color: green;
}
</style>
<div class=parent_block>
  <div id=child_top class=child style="top: 0px;"></div>
</div>
<div class=parent_block>
  <div id=child_bottom class=child style="bottom: 0px;"></div>
</div>
<script>
document.body.offsetTop;
child_top.parentNode.style.borderTop = "50px solid blue";
child_bottom.parentNode.style.borderBottom = "50px solid blue";
</script>

/css/css-position/block-axis-constraint-changes-for-out-of-flow-box-ref.html

<!DOCTYPE html>
<style>
.long {
  width: 200px;
  height: 50px;
  background-color: blue;
}
.short {
  width: 50px;
  height: 50px;
  background-color: green;
}
</style>
<div class=long></div>
<div class=short></div>
<div class=short></div>
<div class=long></div>