You must first open
first.html (from the downloadable files for the book) in your browser and then open
less/first.less in your text editor. In your browser, you will see a representation of a header, body, and footer.
less/first.less contains the Less code that will be converted into valid CSS by the
less.js compiler. Any error in this file will stop the compiler and throw an error. Although the Less code shows some similarities to the plain CSS code, the process described here totally differs from editing your CSS directly.
The following screenshot shows you how this layout will look when opened in your web browser:
CSS3 introduced vendor-specific rules, which ...