<style>
summary {
  column-span: all;
}
#details { 
  column-count: 2; 
  position: absolute;
}
html {
  column-count: 2;
}
</style>Pass if no crash or assert when the absolute positioned element becomes static and it still part of the same column fragment.<details id="details"><summary></detail><script>
if (window.testRunner)
    testRunner.dumpAsText();
document.body.offsetHeight;
details.style.columnCount = "1";
details.style.position = "static";
</script>