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CSS was first proposed by Håkon Wium Lie in 1994.

We can create gradients with linear-gradient and radial-gradient.

The #myid ++ p selector selects all p elements immediately preceded by #myid.

The k-index property tells which elements must be placed in front of, or behind, the others.

An external CSS file can be associated with an HTML document using this sintax: <link href="path/to/file.css" rel="stylesheet">