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Responsive

Device agnostic
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Frontend

UI / UX oriented
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HTML5

Standards-based
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Framework

CSS and JavaScript
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Layouts

Flexbox provides simpler, more flexible layout options like vertical centering.

Button

Flexbox

Flexbox is now the default, and Bootstrap 4 supports SASS out of the box.

Outline
# Label Header Column Data
1,001 responsive bootstrap
grid
1,002 rwd web design
responsive
1,003 free open-source
template
1,003 frontend developer
card panel
1,004 migration bootstrap 4
design
1,005 navbar sticky
header
1,007 layout examples
grid
1,008 migration bootstrap 4
design

It's really good news that the new Bootstrap 4 now has support for CSS 3 flexbox.

The Bootstrap 3.x element that was called "Panel" before, is now called a "Card".

There are also some interesting new text classes for uppercase and capitalize.

If you want to use cool icons in Bootstrap 4, you'll have to find your own such as Font Awesome or Ionicons.

Note

All of these Bootstrap 3.x components have been dropped entirely for the new card component.


Home

1. These Bootstrap 4 Tabs work basically the same as the Bootstrap 3.x tabs.

Pro

2. Tabs are helpful to hide or collapse some addtional content.

Messages

3. You can really put whatever you want into the tab pane.

Settings

4. Some of the Bootstrap 3.x components like well and panel have been dropped for the new card component.


Profile Section

Imagine creating this simple user profile inside a tab card.

Read More Profiles

This is a Bootstrap 4 accordion that uses the .card classes instead of .panel. The single-open section aspect is not working because the parent option (dependent on .panel) has not yet been finalized in BS 4 alpha.

Just like it's predecesor, Bootstrap 4 is mobile-first so that you start by designing for smaller devices such as smartphones and tablets, then proceed to laptop and desktop layouts.

Bootstrap employs a handful of important global styles and settings that you’ll need to be aware of when using it, all of which are almost exclusively geared towards the normalization of cross browser styles.