LayoutTests/fast/multicol/legend-as-column-spanner-assert.html

<style>
input {
  container-type: inline-size;
}
html {
  overflow: -webkit-paged-x;
}
legend {
  position: relative;
  -webkit-column-span: all;
}
</style>
<fieldset readonly="readonly"><legend>PASS if no crash or assert.</fieldset><input>
<script>
window.testRunner?.dumpAsText();
</script>