1. CSS outline properties

    The CSS outline properties draw a border around an element that does not affect layout, making it ideal for highlighting. This covers the `outline` shorthand, as well as `outline-width`, `outline-style`, `outline-color` and `outline-offset`.

  2. CSS text-stroke and text-fill

    Method of declaring the outline (stroke) width and color for text.

  3. css property: outline-width