File: grid-container-as-flex-item-002.html

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<!DOCTYPE html>
<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
<link rel="author" title="Mozilla" href="https://www.mozilla.org/">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1966450">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
<meta name="assert" content="Tests that the inner grid container as a flex item is getting a reflow against its final size.">

<style>
.inner-grid {
  display: grid;
  flex: 1 1 0%;
  width: 100%;
  min-height: 0; /* Disable automatic minimum size in the main axis */
  background: red;
}

.inner-grid-item {
  font: 50px/1 Ahem;
  /* Disable automatic minimum size in inline axis. This is essential to
     reproduce this bug. 'min-width:auto' doesn't reproduce. */
  min-width: 0;
  width: 100%;
  color: transparent;
  background: green;
}
</style>

<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div style="display: grid">
  <div style="display: flex; flex-direction: column; width: 100px">
    <div class="inner-grid">
      <div class="inner-grid-item">XX XX</div>
    </div>
  </div>
</div>