ss="flexbox column" style="box-sizing: border-box; border: 2px solid lightblue; padding: 3px; height: 343px; width: 100px;" data-expected-width=100 data-expected-height=343>
    <div style="-webkit-flex: 1; -moz-flex: 1" data-expected-height=111></div>
    <div style="-webkit-flex: 1; -moz-flex: 1" data-expected-height=111></div>
    <div style="-webkit-flex: 1; -moz-flex: 1" data-expected-height=111></div>
</div>

<script>
    function addExpectedSizes(flexItem) {
        if (!flexItem.hasAttribute('data-e