If you’ve been writing CSS for some time, then you’ve certainly done something similar to the following, and likely multiple times in a single stylesheet:
The lone declaration in the rule set above is what’s commonly referred to as a font stack. This line defines the font that the browser should use for the specified element (in this case, for the <body>
element). The stack is “Arial, Helvetica, sans-serif”. This instructs the browser to take the following steps: