The outline font effect renders a coloured outline around text.

The effect has the following properties:

width | Value: | | | Initial: | 0 | | Percentages: | N/A ||

The width defines the maximum pixel width of the font's outline.

/* Declares a font effect outline. */
h1
{
    header-font-effect: outline;
    header-width: 2px;
    header-colour: black;
}