Syncing named breakpoints across CSS, JS, and HTML.

Demo and more information here.

Declare breakpoints and specify names in _breakpoints.scss

// declare breakpoints
$usn-x-small         : 200px;
$usn-small           : 400px;
$usn-small-medium    : 600px;
$usn-medium          : 800px;
$usn-large-medium    : 1000px;
$usn-large           : 1200px;
$usn-x-large         : 1400px;

// create sass list to pass media query data
// if a breakpoint name changes, remember to
// update it in the list below as well
$mq-sync:
  usn-x-small        $usn-x-small,
  usn-small          $usn-small,
  usn-small-medium   $usn-small-medium,
  usn-medium         $usn-medium,
  usn-large-medium   $usn-large-medium,
  usn-large          $usn-large,
  usn-x-large        $usn-x-large
;

Declase breakpoints and specify names in breakpoints.less

// declare breakpoints
@usn-x-small         : 200px;
@usn-small           : 400px;
@usn-small-medium    : 600px;
@usn-medium          : 800px;
@usn-large-medium    : 1000px;
@usn-large           : 1200px;
@usn-x-large         : 1400px;

// create list to pass media query data
// if a breakpoint name changes, remember to
// update it in the list below as well
@breakpoints: "usn-x-small @{usn-x-small}",
              "usn-small @{usn-small}",
              "usn-small-medium @{usn-small-medium}",
              "usn-medium @{usn-small-medium}",
              "usn-large-medium @{usn-large-medium}",
              "usn-large @{usn-large}",
              "usn-x-large @{usn-x-large}";

// you need to explicity tell LESS how many
// breakpoints you have
@number-of-breakpoints: 7;

Declase breakpoints and specify names in breakpoints.styl

// declare breakpoints
$usn-x-small         = 200px
$usn-small           = 400px
$usn-small-medium    = 600px
$usn-medium          = 800px
$usn-large-medium    = 1000px
$usn-large           = 1200px
$usn-x-large         = 1400px

// create list to pass media query data
// if a breakpoint name changes, remember to
// update it in the list below as well
$mq-sync = usn-x-small        $usn-x-small,
           usn-small          $usn-small,
           usn-small-medium   $usn-small-medium,
           usn-medium         $usn-medium,
           usn-large-medium   $usn-large-medium,
           usn-large          $usn-large,
           usn-x-large        $usn-x-large

Include unison.min.js on your page:

<script src="unison.min.js"></script>

Verify everything is working by entering Unison.getBreakpoints() in the javascript console of your browser. If the CSS is not set up properly, the returned value will be null.

Please view the demo page to see how Responsive Comments conditional loading is implimented via Unison.

The MIT License (MIT)

Copyright (c) 2013 Dan Chilton

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.