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The Bootstrap Blog

Announcements, discussions, and more for Bootstrap and the Official Bootstrap Themes.

Bootstrap 4 Alpha 3

Alpha 3 has landed! We have an overhauled grid, updated form controls, a new font stack, tons of bug fixes, and more. It’s been several months since our last update, but the size of this update should help get us back on track.

Work on Alpha 3 started rather broadly, addressing bug fixes and docs updates of all shapes and sizes, but finished with a narrow focus on our form controls and grid system. If you’ve followed the development in our v4-dev branch, you might already be familiar with some of these bigger changes.

Skip to the updated alpha docs site, or keep reading for the highlights.

Grid system

The grid system was overhauled with three major pull requests—#19099, #20349, and #20361. Those PRs largely focused on the following changes:

  • Our ready-made grid classes (containers and columns) are now behind a Sass variable, meaning grid classes can easily be disabled via Sass variable. Update the boolean $enable-grid-classes variable and recompile to remove them.

  • Grid modifier classes are simpler and no longer require the col- prefix. For example, instead of .col-offset-*-*, .col-push-*-*, and .col-pull-*-*, we now have .offset-*-*, .push-*-*, and .pull-*-*.

  • Mixins have been changed, and then changed again, to in an effort to keep generated classes simple and cooperative between standard and flexbox modes. Our two primary column mixins are now make-col-ready, which houses the position, padding-*s, and min-height (to prevent collapsing empty columns), and make-col for setting the float and width.

  • Added a grid customization section to the docs to explain how to change the number of columns, grid tier breakpoints, container widths, and more.

These changes are available in our standard grid, as well as our flexbox grid. More on that below.

Flexbox

Flexbox auto-layout

Flexbox mode has been updated across the board in Alpha 3, starting from the grid system (it uses the same variable and the updated Sass mixins) and moving through our utilities and components.

  • New flexbox grid docs. In addition to the standard grid docs, we now have a dedicated docs page for our flexbox grid as it behaves slightly differently than the standard grid. This new page includes details on how and why this grid works the way it does, as well as additional code examples.

  • Automatic equal-width column sizing with new .col-{breakpoint} classes. For example, for three equal-width columns at the xs breakpoint, you’d create three columns each with just .col-xs.

  • New flexbox alignment utility classes for vertically and horizontally distributing items. Works with our flexbox grid, as well as just about any other custom component.

Forms

Form validation states

Forms saw a ton of activity early on in Alpha 3’s development. Documentation, class names, layout options, and validation styles have all been drastically improved.

  • New classes for checkboxes, radios, input sizing, and legends. While not 100% final, all our form controls are named more clearly and consistently across our CSS.

  • Replaced the base64 PNG background images with inline SVGs for our custom form controls and validation states. Scale those form controls to your heart’s content!

  • Speaking of validation states, we have brand new form validation and help text options. Validation states can now be applied on a per-input basis (with .form-control-{state}) and optional validation feedback can be shown with .form-control-feedback. Independent form help text can now be controlled with the new .form-text class.

<div class="form-group has-success">
  <label class="col-form-label" for="inputSuccess1">
    Input with success
  </label>
  <input type="text" class="form-control form-control-success" id="inputSuccess1">
  <div class="form-control-feedback">
    Success! You've done it.
  </div>
  <small class="form-text text-muted">
    Example help text that remains unchanged.
  </small>
</div>
  • Fixed a few form related bugs, like the horizontal label padding in #17498, misuse of <fieldset>s for form groups, sizing classes not applying to <select>s, and more.

  • Documentation for forms has been overhauled. We have simpler examples of our available form controls, clearer guidance on validation states (and when to use each), and more.

System fonts

We’ve replaced the decades old Helvetica/Arial font stack with a system font stack, utilizing newer, more readable, and more powerful fonts that companies like Apple, Google, and Microsoft have specifically designed for today’s devices.

Originally this was planned to affect Linux users, but font usage and support is rather inconsistent across distros and user preferences. For that reason, there’s no intended font change for folks on Linux.

And so much more…

There were nearly 1,200 commits to Alpha 3 and this post barely scratches the surface. We’ve fixed dozens of other bugs and worked hard to improve our documentation across the board.

For more details on this release’s changes, take a look at the Alpha 3 ship list issue, as well as the closed Alpha 3 milestone.

Anxious to jump in? Then head to the v4 alpha docs!

Be sure to join our official Slack room! and dive into our issue tracker with bug reports, questions, and general feedback whenever possible.

What’s next?

More exploration, more bugfixes, more docs updates, and, best of all, more alphas. The daily grind keeps us super busy these days, but we’ll do our best to keep the momentum going. Stay tuned!

<3,
@mdo & team

Bootstrap 3.3.7 released

Bootstrap 3.3.7 is here! We’ve had over 220 commits and 80 closed issues and pull requests from nearly 30 contributors since our last release. Woohoo!

Here are some of the highlights:

  • Added support for jQuery 3.
  • Added inline source files into sourcemap eliminating 4xx errors on the CDN.
  • Updated several devDependencies and gems.
  • Removed unsupported vendor prefixes for @viewport.

For a complete breakdown, read the release changelog and the v3.3.7 milestone.

Download Bootstrap

Download the latest release—source code, compiled assets, and documentation—as a ZIP file directly from GitHub:

Download Bootstrap 3.3.7

Hit the project repository or Sass repository for more options. Also, remember we’re available on npm, too.

Bootstrap CDN

After reviewing the changelog, update your CDN links to point to the v3.3.7 files:

<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">

<!-- Optional theme -->
<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap-theme.min.css" integrity="sha384-rHyoN1iRsVXV4nD0JutlnGaslCJuC7uwjduW9SVrLvRYooPp2bWYgmgJQIXwl/Sp" crossorigin="anonymous">

<!-- Latest compiled and minified JavaScript -->
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>

<3,

@cvrebert & team

New Bootstrap 4 alpha

Bootstrap 4 alpha 2 is now available. Since our last release, nearly 100 people have pushed over 900 commits to v4 and we’ve closed over 400 issues and pull requests. Those numbers are outrageously awesome to see, and we’ve still got a ton of work ahead of us this year for v4.

As mentioned in our last post, the general plan for v4’s development starts with a few alpha releases. We’re a little behind on that, but should be getting caught up as the year winds down. Expect another alpha or two this month to really round things out.

Here’s a look at a handful of the changes since our last alpha:

  • Overhauled spacing utilities to use a numerical tiering (to avoid confusion with grid tiers).
  • Continued refactoring efforts to replace markup-specific selectors with classes across several components (including pagination, lists, and more). Still more to do here with additional components.
  • Reverted media queries and grid containers from rems to pixels as viewports are not affected by font-size. See #17403 for details. We’ve got a ton of grid work left, too. Feel free to follow along with #18471.
  • Reverted .0625rem width borders to 1px for more consistent component borders that avoid zoom and font-size bugs across browsers.
  • Renamed .img-responsive to .img-fluid to avoid future confusion on the various responsive image solutions out there.
  • Replaced ZeroClipboard with clipboard.js for Flash-independent copy buttons.
  • Inputs and buttons now share the same border variable to ensure components are always sized similarly.
  • Updated all pseudo-element selectors to use the spec’s preferred double colon (e.g., ::before as opposed to :before).
  • Cards now have outline variants and mixins to support extending base classes further.
  • Utility classes for floats and text alignment now have responsive ranges. This means we’ve dropped the non-responsive classes to avoid duplication.
  • Added support for jQuery 2.
  • And hundreds more Sass improvements, bug fixes, documentation updates, and more.

We highly encourage folks to skim through the second alpha’s milestone on GitHub for a better idea of what’s changed across the board. You can also follow along with other v4 efforts with the v4 label on our issue tracker.

Ready to dive in? Then head to the v4 alpha docs!

Be sure to join our official Slack room! and dive into our issue tracker with bug reports, questions, and general feedback whenever possible.

<3,

@mdo & team

Bootstrap 3.3.6 released

Bootstrap 3.3.6 is here! It’s a long overdue release that addresses dozens of CSS bug fixes and documentation updates. We’ve had over 180 commits and 100 closed issues and pull requests from nearly 30 contributors since our last release. Woohoo!

Here are some of the highlights:

  • Added support for an official NuGet package (yeah, it’s an old one, but folks still use it!).
  • Enabled source maps for our compiled minified CSS.
  • Updated over a dozen browser bug entries as browsers continue to fix bugs (aww yeah!).
  • Updated several JavaScript plugin docs to clarify usage.
  • Made local documentation development easier with a local jQuery fallback.

For a complete breakdown, read the release changelog and the v3.3.6 milestone.

Download Bootstrap

Download the latest release—source code, compiled assets, and documentation—as a ZIP file directly from GitHub:

Download Bootstrap 3.3.6

Hit the project repository or Sass repository for more options. Also, remember we’re available on npm, too.

Bootstrap CDN

After reviewing the changelog, update your CDN links to point to the v3.3.6 files:

<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">

<!-- Optional theme -->
<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap-theme.min.css">

<!-- Latest compiled and minified JavaScript -->
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>

<3,

@mdo & team

Bootstrap 4 alpha

Today is a special day for Bootstrap. Not only is it our fourth birthday, but after a year of development, we’re finally shipping the first alpha release of Bootstrap 4. Hell yeah!

Bootstrap 4 has been a massive undertaking that touches nearly every line of code. We’re stoked to share it with you and hear your feedback. We’ve got a lot of news to share with you, so let’s jump right into it.

What’s new

Bootstrap 4 alpha

There are a ton of major changes to Bootstrap and it’s impossible to cover them all in detail here, so here are some of our favorite highlights:

  • Moved from Less to Sass. Bootstrap now compiles faster than ever thanks to Libsass, and we join an increasingly large community of Sass developers.
  • Improved grid system. We’ve added a new grid tier to better target mobile devices and completely overhauled our semantic mixins.
  • Opt-in flexbox support is here. The future is now—switch a boolean variable and recompile your CSS to take advantage of a flexbox-based grid system and components.
  • Dropped wells, thumbnails, and panels for cards. Cards are a brand new component to Bootstrap, but they’ll feel super familiar as they do nearly everything wells, thumbnails, and panels did, only better.
  • Consolidated all our HTML resets into a new module, Reboot. Reboot steps in where Normalize.css stops, giving you more opinionated resets like box-sizing: border-box, margin tweaks, and more all in a single Sass file.
  • Brand new customization options. Instead of relegating style embellishments like gradients, transitions, shadows, and more to a separate stylesheet like v3, we’ve moved all those options into Sass variables. Want default transitions on everything or to disable rounded corners? Simply update a variable and recompile.
  • Dropped IE8 support and moved to rem and em units. Dropping support for IE8 means we can take advantage of the best parts of CSS without being held back with CSS hacks or fallbacks. Pixels have been swapped for rems and ems where appropriate to make responsive typography and component sizing even easier. If you need IE8 support, keep using Bootstrap 3.
  • Rewrote all our JavaScript plugins. Every plugin has been rewritten in ES6 to take advantage of the newest JavaScript enhancements. They also now come with UMD support, generic teardown methods, option type checking, and tons more.
  • Improved auto-placement of tooltips and popovers thanks to the help of a library called Tether.
  • Improved documentation. We rewrote it all in Markdown and added a few handy plugins to streamline examples and code snippets to make working with our docs way easier. Improved search is also on its way.
  • And tons more! Custom form controls, margin and padding classes, new utility classes, and more have also been included.

And that barely scratches the surface of the 1,100 commits and 120,000 lines of changes in v4 so far. Plus, we’re not even done yet!

Ready to check it out? Then head to the v4 alpha docs!

Development plan

We need your help to make Bootstrap 4 the best it can be. Starting today, the source code for v4 will be available in a v4-dev branch on GitHub. In addition, we have a v4 development and tracking pull request that includes a master checklist of changes we’ve made and our remaining possible todos. We’d love for y’all to help chip away at those todos.

The general development and release plan looks something like this:

  • A few alpha releases while things are still in flux.
  • Two beta releases after features and functionality are locked down to really test things out.
  • Two release candidates (RCs) to really test things out closer to production environments.
  • Then, the final release!

For those jamming on v4 with us, we also have a dedicated v4 Slack channel. Jump in to talk shop and work with your fellow Bootstrappers. If you haven’t yet, join our official Slack room!.

If you’re not keen on pushing code to v4, we’d love to hear from you in our issue tracker with bug reports, questions, and general feedback.

Supporting v3

When we shipped Bootstrap 3, we immediately discontinued all support for v2.x, causing a lot of pain for all our users out there. That was a mistake we won’t be making again. For the foreseeable future, we’ll be maintaining Bootstrap 3 with critical bug fixes and documentation improvements. v3 docs will also continue to be hosted after v4’s final release.

One more thing…

In addition to shipping the first Bootstrap 4 alpha today, we’re also launching our latest side project, Official Bootstrap Themes.

Official Bootstrap Themes

We’ve talked about building premium themes for Bootstrap since our earliest releases, but never quite found the time or ideal approach until earlier this year. We’ve poured hundreds of hours into these themes and consider them to be much more than traditional re-skins of Bootstrap. They’ve very much their own toolkits, just like Bootstrap.

To start, we’re launching with three themes built on Bootstrap 3: a dashboard, an application, and a marketing site. Each theme contains everything you’d find in Bootstrap, plus stunning real world examples, brand new components and plugins, custom documentation, and simple build tools.

All themes include a multiple-use license for the purchaser and free updates for bug fixes and documentation updates for the life of the themes.

Head to the Bootstrap themes site to check them out.

<3,

@mdo, @fat, & team