n-size vs. explicit cross-size, & vice versa -->
    <div class="flexbox">
      <div style="min-width: 70px; height: 20px"
           data-expected-width="70" data-expected-height="20">
        <p>xx xxx</p>
        <p>xx</p>
      </div>
    </div>
    <div class="flexbox">
      <div style="width: 40px; max-height: 20px"
           data-expected-width="40" data-expected-height="20">
        <p>xx xxx</p>
        <p>xx</p>
      </div>
    </div>
    <div class="flexbox">
      <div style="max-width: 20px