Phone : < 600px
Tablet-portrait: > 600px && < 900px
Tablet-landscape: > 900px && < 1200px
Desktop: > 1200px
Markup
<p> Phone : < 600px </p>
<p> Tablet-portrait: > 600px && < 900px </p>
<p> Tablet-landscape: > 900px && < 1200px </p>
<p> Desktop: > 1200px </p>
Source:
src/mediaqueries.less, line 1