If Verdana not present, all fonts look the same at the end of this exercise on Ubuntu 20 with Firefox. DejaVu Sans is a common Linux sans-serif font installed by default on popular Linux distros.  | 
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| .. | ||
| 01-css-methods | ||
| 02-class-id-selectors | ||
| 03-grouping-selectors | ||
| 04-chaining-selectors | ||
| 05-descendant-combinator | ||
| 06-cascade-fix | ||