position-change-keeping-geometry.html

<!DOCTYPE html>
<script src="../resources/text-based-repaint.js"></script>
<script>
function changePositionKeepingGeometry(id, newPosition) {
  var target = document.getElementById(id);
  var originalTop = target.offsetTop;
  var originalLeft = target.offsetLeft;
  target.style.position = newPosition;
  target.style.top = originalTop + 'px';
  target.style.left = originalLeft + 'px';
}

function repaintTest()
{
  changePositionKeepingGeometry('target1', 'absolute');
  changePositionKeepingGeometry('target2', 'absolute');
  changePositionKeepingGeometry('target3', 'fixed');
}
onload = runRepaintAndPixelTest;
</script>
<style>
body {
  margin: 0;
}
div {
  width: 100px;
  height: 100px;
  top: 20px;
  background-color: blue;
}
#target0 {
  left: 20px;
  position: relative;
}
#target1 {
  left: 20px;
  position: relative;
}
#target2 {
  left: 220px;
  position: fixed;
  z-index: 0;
}
#target3 {
  left: 420px;
  position: absolute;
  z-index: 0;
}
</style>
There should be no invalildations on change of position without actual change of position and size.
<!-- target0 ensures we don't strip anonymous wrappers (and trigger a layout) when the other elements change position. -->
<div id="target0"></div>
<div id="target1"></div>
<div id="target2"></div>
<div id="target3"></div>
chromium/third_party/blink/web_tests/paint/invalidation/position/position-change-keeping-geometry.html
