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<title>CSS Test: flex base size that depends on cross size</title>
<link rel="author" title="Oriol Brufau" href="obrufau@igalia.com">
<link rel="help" href="https://drafts.csswg.org/css-flexbox-1/#flex-base-size">
<link rel="help" href="https://drafts.csswg.org/css-flexbox-1/#definite-sizes">
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11791">
<meta name="assert" content="The flex item has a definite cross size of 100px
  because it stretches. So 