new line in ol.style.Text is ignored while zooming

When defining the text style with new line "\n" in text attribute, the text appears inline while zooming, both in cluster and original feature.

`text: new ol.style.Text(
{	text: size.toString() + "\nnew line",
	fill: new ol.style.Fill(
	{	color: '#fff'
	})
})`

I tweaked this example changing just the code above.
http://viglino.github.io/OL3-AnimatedCluster/