<!DOCTYPE html>
<html>
<style>
#flexbox {
  background-color: lightgrey;
  align-items: flex-start;
}
#flexbox > * {
  border: 1px solid green;
}
</style>
<body>
<p>
This example is from the spec. There should be four flex items. Anonymous item 3 shouldn't have
a green border because the anonymous block is the flex item.
</p>
<div id="flexbox" style="display: flex">

    <!-- flex item: block child -->
    <div id="item1">block</div>

    <!-- flex item: floated element; floating is ignored -->
    <div id="item2" style="float: left;">float</div>

    <!-- flex item: anonymous block box around inline content -->
    anonymous item 3

    <!-- flex item: inline child -->
    <span>
        item 4
        <!-- flex items do not split around blocks -->
        <div id=not-an-item>item 4</div>
        item 4
    </span>
</div>
</body>
</html>