1、Requires HTML5 doctype
1 <!DOCTYPE html>
2 <html lang="en">
3 ...
4 </html>
2、The default Bootstrap grid system utilizes 12 columns.making for a 940px wide container without responsive features enabled. With the responsive CSS file added, the grid adapts to be 724px and 1170px wide depending on your viewport. Below 767px viewports, the columns become fluid and stack vertically.
1 <div class="row">
2 <div class="span9">
3 Level 1 column
4 <div class="row">
5 <div class="span6">Level 2</div>
6 <div class="span3">Level 2</div>
7 </div>
8 </div>
9 </div>
Basic fluid grid HTML
The fluid grid system uses percents instead of pixels for column widths.
1 <div class="row-fluid">
2 <div class="span4">...</div>
3 <div class="span8">...</div>
4 </div>
Move columns to the right using .offset* classes. Each class increases the left margin of a column by a whole column.
nesting columns
To nest your content with the default grid, add a new .row and set of .span* columns within an existing .span* column. nested rows should include a set of columns that add up to the number of columns of its parent.
3、Layouts
Fixed layout
Provides a common fixed-width (and optionally responsive) layout with only <div class="container"> required.
Fluid layout， use <div class="container-fluid">
4、Responsive design
Turn on responsive CSS in your project by including the proper Meta tag and additional stylesheet within the <head> of your document. If you've compiled Bootstrap from the Customize page, you need only include the Meta tag.
1 <Meta name="viewport" content="width=device-width, initial-scale=1.0">
2 <link href="assets/css/bootstrap-responsive.css" rel="stylesheet">
5、base css
Body copy
Bootstrap's global default font-size is 14px, with a line-height of 20px. This is applied to the <body> and all paragraphs. In addition, <p> (paragraphs) receive a bottom margin of half their line-height (10px by default).
Make a paragraph stand out by adding .lead.
Emphasis
<small></small> <strong></strong> <em><./em>( italicized text.)
Emphasis classes
1 <p class="muted">Fusce dapibus, tellus ac cursus commodo, tortor mauris nibh.</p>
2 <p class="text-warning">Etiam porta sem malesuada magna mollis euismod.</p>
3 <p class="text-error">Donec ullamcorper nulla non metus auctor fringilla.</p>
4 <p class="text-info">Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis.</p>
5 <p class="text-success">Duis mollis, est non commodo luctus, nisi erat porttitor ligula.</p>
http://twitter.github.com/bootstrap/base-css.html
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