The outline-style CSS property is used to set the style of the outline that surrounds an element. It determines the visual appearance of the outline, such as whether it is solid, dashed, dotted, or other styles.

The outline-style property accepts various values, including:

  • none: No outline is displayed.
  • solid: The outline is a solid line.
  • dashed: The outline is made up of dashed lines.
  • dotted: The outline is made up of dotted lines.
  • double: The outline is a double line.
  • groove: The outline appears as a 3D groove.
  • ridge: The outline appears as a 3D ridge.
  • inset: The outline appears as a 3D inset.
  • outset: The outline appears as a 3D outset.

Here’s an example:

button {
  outline-style: dotted;

In this example, the button element is styled with a dotted outline. When the button gains focus or is activated, a dotted outline will be visible around it.

You can choose the appropriate outline-style value to achieve the desired visual effect for outlining elements. It’s important to note that the outline-style property is typically used in conjunction with outline-width and outline-color to fully customize the appearance of outlines.

The outline-style property is particularly useful for indicating focus or interactivity on elements, improving accessibility and user experience.