CSS3 Vendor-prefixing

　　Browser vendors needed a way to add support for new features that were not yet standardized, but without messing up later changes or creating incompatibles. To solve this issue Vendor Prefixes were created. A vendor prefixes is a special prefix added to a CSS property. Each rendering engine has it's own prefix which will only apply the property to that particular browser.

The major browsers use the following prefixes:

• -webkit- (Chrome, Safari, newer versions of Opera, almost all iOS browsers (including Firefox for iOS); basically, any WebKit based browser)
• -moz- (Firefox)
• -o- (Old, pre-WebKit, versions of Opera)
• -ms- (Internet Explorer and Microsoft Edge)

So, for exmaple, a Firefox prefix for the transform property will be written as -

.example {
  -moz-transform: value;
　-moz-border-radius: 10px; 
　-webkit-border-radius: 10px; 
  -o-border-radius: 10px; 
　border-radius: 10px;
}

Autoprefixer

　　Working with Autoprefixer is simple: just forget about vendor prefixes and write normal CSS according to the latest W3C specs. You don’t need a special language (like Sass) or remember where you must use mixins.

Autoprefixer supports selectors (like :fullscreen and ::selection), unit function (calc()), at‑rules (@supports and @keyframes) and properties.

Because Autoprefixer is a postprocessor for CSS, you can also use it with preprocessors such as Sass, Stylus or LESS.

https://github.com/sindresorhus/sublime-autoprefixer

https://www.w3.org/TR/CSS/#css