Introduction
HTML 3.2 specification add <font> , color attributes ect. It started a nightmare for the web developers.
Development of large websites, where fonts and color information were added to every single page, became a long and expensive process.
W3C: World Wide Web Consortium created CSS to solve this problem, removed the style formatting from the web page!
The magic: you can change the look of an entire website by changing just one file!
CSS stands for Cascading Style Sheets (层级样式表).
CSS is a language that describes how HTML elements are to be displayed on screen, paper or in other media.
Reference URLS
https://developer.mozilla.org/en-US/docs/Web/CSS
https://www.w3schools.com/css/default.asp
CSS Properties Reference https://www.w3schools.com/cssref/default.asp
CSS Selectors Reference https://www.w3schools.com/cssref/css_selectors.asp
CSS Functions Reference https://www.w3schools.com/cssref/css_functions.asp
CSS Animatable Reference https://www.w3schools.com/cssref/css_animatable.asp
CSS Aural Reference https://www.w3schools.com/cssref/css_ref_aural.asp
CSS Units https://www.w3schools.com/cssref/css_units.asp
CSS Color Reference
https://www.w3schools.com/cssref/css_colors.asp
https://www.w3schools.com/colors/default.asp
CSS Default Values https://www.w3schools.com/cssref/css_default_values.asp
CSS Browser Support https://www.w3schools.com/cssref/css3_browsersupport.asp
CSS Examples https://www.w3schools.com/css/css_examples.asp
Responsive Web Design-Templates https://www.w3schools.com/css/css_rwd_templates.asp
CSS Certification https://www.w3schools.com/cert/cert_css.asp
to be continue ......
