The Design of HTML5
http://adactio.com/articles/1704/
译文：HTML5设计原理
http://www.cn-cuckoo.com/2010/10/21/the-design-of-html5-2151.html

MARKDOWN
http://www.zhihu.com/question/19963642
http://daringfireball.net/projects/markdown/syntax
http://www.codinghorror.com/blog/2012/10/the-future-of-markdown.html

http://csshat.com/
CSS Hat turns Photoshop layer styles to CSS3. Instantly.
cool.不过是收费的~

SASS
http://sass-lang.com/
DART
http://www.dartlang.org/

http://smacss.com/
SMACSS (pronounced “smacks”) is more style guide than rigid framework. There is no library within here for you to download or install. SMACSS is a way to examine your design process and as a way to fit those rigid frameworks into a flexible thought process. It is an attempt to document a consistent approach to site development when using CSS.
http://smacss.com/book/resources

http://24ways.org/2011/front-end-style-guides/

CSS参考手册
http://css.doyoe.com/

Another CSS pre-processor: Stylus
http://daker.me/2013/07/why-stylus-fit-better-my-needs.html

http://dochub.io/#html/
http://dochub.io/#css/

CSS
1 Mon 29 Jul 2013 2:14 AM HKT (UTC +0800) 10.40 / 12.00
Which statements describe the CSS box model?
Right: It was historically implemented differently in the Internet Explorer family of browsers
link: https://en.wikipedia.org/wiki/Internet_Explorer_box_model_bug
Question 3 CSS inheritance
Right: The inheritance cascade is a systematic way to determine which of several possible styles applies to an element
Wrong: It allows you to leave out HTML elements from a page, implicitly specifying them via CSS inheritance
links:
https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Getting_started
https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Getting_started/Cascading_and_inheritance
Question 9
which of the following corresponds to a CSS rule in the above CSS snippet?
这个错应该是英语没理解的问题……

conditional stylesheets
http://css-tricks.com/how-to-create-an-ie-only-stylesheet/

How to Center Anything With CSS
http://designshack.net/articles/css/how-to-center-anything-with-css/

http://www.csser.com/
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Emmet LiveStyle
Emmet LiveStyle is a plugin for live bi-directional (editor↔browser) CSS editing of new generation. Currently, it works in Google Chrome, Safari and Sublime Text, more browsers and editors will be available later.
http://livestyle.emmet.io/