<div class="test"><div>foo</div></div>
.test {
display: flex;
flex-wrap: wrap;
border: 1px solid black;
width: 200px;
height: 100px;
align-content: center;
justify-content: center;
margin: 30px auto;
}
Chrome ignores the align-content
property, Firefox, Edge, Safari will not.
Which does not seem to be explicitly defined in the specification.
Demo: http://jsbin.com/vuxorikewe/edit?html,css,output

