--- layout: default title: Migrating to v3.x slug: migration lead: "Guidance on how to upgrade from Bootstrap v2.x to v3.x with emphasis on major changes, what's new, and what's been removed." ---

Migrating from 2.x to 3.0

Bootstrap 3 is not backwards compatible with v2.x. Use this section as a general guide to upgrading from v2.x to v3.0. For a broader overview, see what's new in the v3.0 release announcement.

Major class changes

This table shows the style changes between v2.x and v3.0.

Bootstrap 2.x Bootstrap 3.0
.row-fluid .row
.span* .col-md-*
.offset* .col-md-offset-*
.brand .navbar-brand
.navbar .nav .navbar-nav
.nav-collapse .navbar-collapse
.nav-toggle .navbar-toggle
.btn-navbar .navbar-btn
.hero-unit .jumbotron
.icon-* .glyphicon .glyphicon-*
.btn .btn .btn-default
.btn-mini .btn-xs
.btn-small .btn-sm
.btn-large .btn-lg
.alert .alert .alert-warning
.alert-error .alert-danger
.visible-phone .visible-xs
.visible-tablet .visible-sm
.visible-desktop Split into .visible-md .visible-lg
.hidden-phone .hidden-xs
.hidden-tablet .hidden-sm
.hidden-desktop Split into .hidden-md .hidden-lg
.input-block-level .form-control
.control-group .form-group
.control-group.warning .control-group.error .control-group.success .form-group.has-*
.checkbox.inline .radio.inline .checkbox-inline .radio-inline
.input-prepend .input-append .input-group
.add-on .input-group-addon
.img-polaroid .img-thumbnail
ul.unstyled .list-unstyled
ul.inline .list-inline
.muted .text-muted
.label .label .label-default
.label-important .label-danger
.text-error .text-danger
.table .error .table .danger
.bar .progress-bar
.bar-* .progress-bar-*
.accordion .panel-group
.accordion-group .panel .panel-default
.accordion-heading .panel-heading
.accordion-body .panel-collapse
.accordion-inner .panel-body

What's new

We've added new elements and changed some existing ones. Here are the new or updated styles.

Element Description
Panels .panel .panel-default .panel-body .panel-title .panel-heading .panel-footer .panel-collapse
List groups .list-group .list-group-item .list-group-item-text .list-group-item-heading
Glyphicons .glyphicon
Jumbotron .jumbotron
Extra small grid (<768px) .col-xs-*
Small grid (≥768px) .col-sm-*
Medium grid (≥992px) .col-md-*
Large grid (≥1200px) .col-lg-*
Responsive utility classes (≥1200px) .visible-lg .hidden-lg
Offsets .col-sm-offset-* .col-md-offset-* .col-lg-offset-*
Push .col-sm-push-* .col-md-push-* .col-lg-push-*
Pull .col-sm-pull-* .col-md-pull-* .col-lg-pull-*
Input height sizes .input-sm .input-lg
Input groups .input-group .input-group-addon .input-group-btn
Form controls .form-control .form-group
Button group sizes .btn-group-xs .btn-group-sm .btn-group-lg
Navbar text .navbar-text
Navbar header .navbar-header
Justified tabs / pills .nav-justified
Responsive images .img-responsive
Contextual table rows .success .danger .warning .active .info
Contextual panels .panel-success .panel-danger .panel-warning .panel-info
Modal .modal-dialog .modal-content
Thumbnail image .img-thumbnail
Well sizes .well-sm .well-lg
Alert links .alert-link

What's removed

The following elements have been dropped or changed in v3.0.

Element Removed from 2.x 3.0 Equivalent
Form actions .form-actions N/A
Search form .form-search N/A
Form group with info .control-group.info N/A
Fixed-width input sizes .input-mini .input-small .input-medium .input-large .input-xlarge .input-xxlarge Use .form-control and the grid system instead.
Block level form input .input-block-level No direct equivalent, but forms controls are similar.
Inverse buttons .btn-inverse N/A
Fluid row .row-fluid .row (no more fixed grid)
Controls wrapper .controls N/A
Controls row .controls-row .row or .form-group
Navbar inner .navbar-inner N/A
Navbar vertical dividers .navbar .divider-vertical N/A
Dropdown submenu .dropdown-submenu N/A
Tab alignments .tabs-left .tabs-right .tabs-below N/A
Pill-based tabbable area .pill-content .tab-content
Pill-based tabbable area pane .pill-pane .tab-pane
Nav lists .nav-list .nav-header No direct equivalent, but list groups and .panel-groups are similar.
Inline help for form controls .help-inline No exact equivalent, but .help-block is similar.
Non-bar-level progress colors .progress-info .progress-success .progress-warning .progress-danger Use .progress-bar-* on the .progress-bar instead.

Additional notes

Other changes in v3.0 are not immediately apparent. Base classes, key styles, and behaviors have been adjusted for flexibility and our mobile first approach. Here's a partial list:

For more information on upgrading to v3.0, and code snippets from the community, see Bootply.