diff --git a/src/bootlint.js b/src/bootlint.js
index eeda4280..285b6cd1 100644
--- a/src/bootlint.js
+++ b/src/bootlint.js
@@ -609,6 +609,324 @@ var LocationIndex = _location.LocationIndex;
         }
     });
     */
+    addLinter('W018', function bs3ClassUsed($, reporter) {
+        var bs3Selectors = [
+            'td.active, th.active, tr.info',
+            '.affix',
+            '.alert-dismissable',
+            '.blockquote-reverse',
+            '.tooltip.bottom, .popover.bottom',
+            '.bottom-left',
+            '.bottom-right',
+            '.btn-default',
+            '.btn-group-justified',
+            '.btn-group-xs',
+            '.btn-xs',
+            '.thumbnail .caption',
+            '.caret',
+            '.carousel-control',
+            '.center-block',
+            '.checkbox label',
+            '.checkbox-inline label',
+            '.col-lg-offset-0',
+            '.col-lg-offset-1',
+            '.col-lg-offset-2',
+            '.col-lg-offset-3',
+            '.col-lg-offset-4',
+            '.col-lg-offset-5',
+            '.col-lg-offset-6',
+            '.col-lg-offset-7',
+            '.col-lg-offset-8',
+            '.col-lg-offset-9',
+            '.col-lg-offset-10',
+            '.col-lg-offset-11',
+            '.col-lg-offset-12',
+            '.col-lg-pull-0',
+            '.col-lg-pull-1',
+            '.col-lg-pull-2',
+            '.col-lg-pull-3',
+            '.col-lg-pull-4',
+            '.col-lg-pull-5',
+            '.col-lg-pull-6',
+            '.col-lg-pull-7',
+            '.col-lg-pull-8',
+            '.col-lg-pull-9',
+            '.col-lg-pull-10',
+            '.col-lg-pull-11',
+            '.col-lg-pull-12',
+            '.col-lg-push-0',
+            '.col-lg-push-1',
+            '.col-lg-push-2',
+            '.col-lg-push-3',
+            '.col-lg-push-4',
+            '.col-lg-push-5',
+            '.col-lg-push-6',
+            '.col-lg-push-7',
+            '.col-lg-push-8',
+            '.col-lg-push-9',
+            '.col-lg-push-10',
+            '.col-lg-push-11',
+            '.col-lg-push-12',
+            '.col-md-offset-0',
+            '.col-md-offset-1',
+            '.col-md-offset-2',
+            '.col-md-offset-3',
+            '.col-md-offset-4',
+            '.col-md-offset-5',
+            '.col-md-offset-6',
+            '.col-md-offset-7',
+            '.col-md-offset-8',
+            '.col-md-offset-9',
+            '.col-md-offset-10',
+            '.col-md-offset-11',
+            '.col-md-offset-12',
+            '.col-md-pull-0',
+            '.col-md-pull-1',
+            '.col-md-pull-2',
+            '.col-md-pull-3',
+            '.col-md-pull-4',
+            '.col-md-pull-5',
+            '.col-md-pull-6',
+            '.col-md-pull-7',
+            '.col-md-pull-8',
+            '.col-md-pull-9',
+            '.col-md-pull-10',
+            '.col-md-pull-11',
+            '.col-md-pull-12',
+            '.col-md-push-0',
+            '.col-md-push-1',
+            '.col-md-push-2',
+            '.col-md-push-3',
+            '.col-md-push-4',
+            '.col-md-push-5',
+            '.col-md-push-6',
+            '.col-md-push-7',
+            '.col-md-push-8',
+            '.col-md-push-9',
+            '.col-md-push-10',
+            '.col-md-push-11',
+            '.col-md-push-12',
+            '.col-sm-offset-0',
+            '.col-sm-offset-1',
+            '.col-sm-offset-2',
+            '.col-sm-offset-3',
+            '.col-sm-offset-4',
+            '.col-sm-offset-5',
+            '.col-sm-offset-6',
+            '.col-sm-offset-7',
+            '.col-sm-offset-8',
+            '.col-sm-offset-9',
+            '.col-sm-offset-10',
+            '.col-sm-offset-11',
+            '.col-sm-offset-12',
+            '.col-sm-pull-0',
+            '.col-sm-pull-1',
+            '.col-sm-pull-2',
+            '.col-sm-pull-3',
+            '.col-sm-pull-4',
+            '.col-sm-pull-5',
+            '.col-sm-pull-6',
+            '.col-sm-pull-7',
+            '.col-sm-pull-8',
+            '.col-sm-pull-9',
+            '.col-sm-pull-10',
+            '.col-sm-pull-11',
+            '.col-sm-pull-12',
+            '.col-sm-push-0',
+            '.col-sm-push-1',
+            '.col-sm-push-2',
+            '.col-sm-push-3',
+            '.col-sm-push-4',
+            '.col-sm-push-5',
+            '.col-sm-push-6',
+            '.col-sm-push-7',
+            '.col-sm-push-8',
+            '.col-sm-push-9',
+            '.col-sm-push-10',
+            '.col-sm-push-11',
+            '.col-sm-push-12',
+            '.col-xs-1',
+            '.col-xs-2',
+            '.col-xs-3',
+            '.col-xs-4',
+            '.col-xs-5',
+            '.col-xs-6',
+            '.col-xs-7',
+            '.col-xs-8',
+            '.col-xs-9',
+            '.col-xs-10',
+            '.col-xs-11',
+            '.col-xs-12',
+            '.col-xs-offset-0',
+            '.col-xs-offset-1',
+            '.col-xs-offset-2',
+            '.col-xs-offset-3',
+            '.col-xs-offset-4',
+            '.col-xs-offset-5',
+            '.col-xs-offset-6',
+            '.col-xs-offset-7',
+            '.col-xs-offset-8',
+            '.col-xs-offset-9',
+            '.col-xs-offset-10',
+            '.col-xs-offset-11',
+            '.col-xs-offset-12',
+            '.col-xs-pull-0',
+            '.col-xs-pull-1',
+            '.col-xs-pull-2',
+            '.col-xs-pull-3',
+            '.col-xs-pull-4',
+            '.col-xs-pull-5',
+            '.col-xs-pull-6',
+            '.col-xs-pull-7',
+            '.col-xs-pull-8',
+            '.col-xs-pull-9',
+            '.col-xs-pull-10',
+            '.col-xs-pull-11',
+            '.col-xs-pull-12',
+            '.col-xs-push-0',
+            '.col-xs-push-1',
+            '.col-xs-push-2',
+            '.col-xs-push-3',
+            '.col-xs-push-4',
+            '.col-xs-push-5',
+            '.col-xs-push-6',
+            '.col-xs-push-7',
+            '.col-xs-push-8',
+            '.col-xs-push-9',
+            '.col-xs-push-10',
+            '.col-xs-push-11',
+            '.col-xs-push-12',
+            '.control-label',
+            'td.danger, th.danger, tr.danger',
+            '.dl-horizontal',
+            '.dropdown-backdrop',
+            '.dropdown-menu-left',
+            '.form-control-static',
+            '.form-group-lg',
+            '.form-group-sm',
+            '.form-horizontal',
+            '.has-error',
+            '.has-success',
+            '.has-warning',
+            '.help-block',
+            '.hidden',
+            '.hidden-lg',
+            '.hidden-md',
+            '.hidden-print',
+            '.hidden-sm',
+            '.hidden-xs',
+            '.hide',
+            '.icon-bar',
+            '.icon-next',
+            '.icon-prev',
+            '.img-circle',
+            '.img-responsive',
+            '.img-rounded',
+            '.fade.in, .collapse.in, .navbar-collapse.in, .modal.in, .modal-backdrop.in, .tooltip.in',
+            'td.info, th.info, tr.info',
+            '.input-lg',
+            '.input-sm',
+            '.carousel-inner > .item',
+            '.label',
+            '.label-danger',
+            '.label-default',
+            '.label-info',
+            '.label-primary',
+            '.label-success',
+            '.label-warning',
+            '.tooltip.left, .popover.left, .item.left',
+            '.list-group-item-heading',
+            '.list-group-item-text',
+            '.media-bottom',
+            '.media-heading',
+            '.media-left',
+            '.media-list',
+            '.media-middle',
+            '.media-object',
+            '.media-right',
+            '.navbar-btn',
+            '.navbar-default',
+            '.navbar-fixed-bottom',
+            '.navbar-fixed-top',
+            '.navbar-form',
+            '.navbar-header',
+            '.navbar-inverse',
+            '.navbar-left',
+            '.navbar-link',
+            '.navbar-right',
+            '.navbar-static-top',
+            '.navbar-toggle',
+            '.nav-divider',
+            '.nav-stacked',
+            '.nav-tabs-justified',
+            '.item.next',
+            '.btn-group.open',
+            '.page-header',
+            '.pager',
+            '.panel',
+            '.panel-body',
+            '.panel-collapse',
+            '.panel-danger',
+            '.panel-default',
+            '.panel-footer',
+            '.panel-group',
+            '.panel-heading',
+            '.panel-info',
+            '.panel-primary',
+            '.panel-success',
+            '.panel-title',
+            '.panel-warning',
+            '.popover-content',
+            '.popover-title',
+            '.item.prev, .carousel-inner > .prev',
+            '.pager .previous',
+            '.progress-bar-danger',
+            '.progress-bar-info',
+            '.progress-bar-success',
+            '.progress-bar-warning',
+            '.progress-striped',
+            '.pull-left',
+            '.pull-right',
+            '.radio label',
+            '.radio-inline label',
+            '.row-no-gutters',
+            'td.success, th.success, tr.success',
+            '.table-condensed',
+            '.thumbnail',
+            '.tooltip-arrow',
+            '.tooltip.top, .popover.top',
+            '.tooltip.top-left',
+            '.tooltip.top-right',
+            '.visible-lg',
+            '.visible-lg-block',
+            '.visible-lg-inline',
+            '.visible-lg-inline-block',
+            '.visible-md',
+            '.visible-md-block',
+            '.visible-md-inline',
+            '.visible-md-inline-block',
+            '.visible-print',
+            '.visible-print-block',
+            '.visible-print-inline',
+            '.visible-print-inline-block',
+            '.visible-sm',
+            '.visible-sm-block',
+            '.visible-sm-inline',
+            '.visible-sm-inline-block',
+            '.visible-xs',
+            '.visible-xs-block',
+            '.visible-xs-inline',
+            '.visible-xs-inline-block',
+            'td.warning, th.warning, tr.warning',
+            '.well',
+            '.well-lg',
+            '.well-sm'
+        ];
+        var bs3Usage = $(bs3Selectors.join());
+        if (bs3Usage.length) {
+            reporter('Found usage of CSS classes possibly indicative of Bootstrap 3 and not newer versions.', bs3Usage);
+        }
+    });
     addLinter('E001', (function () {
         var MISSING_DOCTYPE = 'Document is missing a DOCTYPE declaration';
         var NON_HTML5_DOCTYPE = 'Document declares a non-HTML5 DOCTYPE';