<style>
.flexBox {
    display: -webkit-flex;
    width: min-content;
    writing-mode: vertical-lr;
    -webkit-flex-direction: column-reverse;    
}
.flexItem {
    flex: 0 0 50%;
    text-anchor: middle; 
}
</style>
Pass if no crash or assert.
<div class=flexBox><input class=flexItem><div class=flexItem></div></div>
<script>
if (window.testRunner)
    testRunner.dumpAsText();
</script>