Everything has changed. In case you haven't been following the Bootstrap 3 work-in-progress, let's start with a quick summary of what's changed for 3. For starters, the 2.x grid has been completely rethought in an effort to acheive "mobile first". From Bootstrap 2.3.2 to 3.0 RC 1 there were over 1,600 commits, 72,000 additions/deletions and 300 changed files. Mobile First "Mobile first" is a responsive Web design practice that prioritizes consideration of smart phones and mobile devices when creating Web pages. For Bootstrap 3, there is no longer a separate bootstrap-responsive.css file. All responsive features are now compiled into a single core bootstrap.css file. Bootstrap 3 allows Web page elements (text, images, buttons, paragraphs, etc..) to scale accordingly as the viewing area, size and resolution changes from wide-screen desktop to tablet to small screen smartphone. Mobile-first elimates to need to make separate desktop and mobile versions of your Web site. The New Grid The more powerful (and 100% fluid) Bootstrap 3 grid now comes in 4 sizes (or "breakpoints"). Tiny (for smartphones .col-xs-*), Small (for tablets .col-sm-*), Medium (for laptops .col-md-*) and Large (for laptops/desktops .col-lg-*). The 3 grid sizes enable you to control grid behavior on different devices (desktop, laptops, tablet, smartphone, etc..).
Unlike 2.x, Bootstrap 3 does not provide a fixed (pixel-based) grid. While a fixed-width layout can still be acheived using a simple custom wrapper, there is now only one percentage-based (fluid) grid. The .container and .row classes are now fluid by default, so don't use .row-fluid or .container-fluid anymore in your 3.x markup. Also, the grid gutter (spacing between the columns) is done using padding instead of margins.
Lightweight Unlike 2.x, all CSS classes for Bootstrap 3 are contained in a single file. The CSS has been optimized for performance. It's about 79KB (minified). In CSS terms, the new Bootstrap 3 allows for simpler customization by improving on inheritance and specificity. You don't need to understand the forementioned, but realize that Bootstrap 3 does require more markup in your HTML. In the end, it will mean less customization and CSS overrides to acheive what you want. Also, the icons (glyphicons) are now contained in a separate css file.
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