outline CSS property on arvau

MDN / outline CSS property

The outline CSS shorthand property sets most of the outline properties in a single declaration.

outline: solid;

outline: dashed red;

outline: 1rem solid;

outline: thick double #32a1ce;

outline: 8px ridge rgb(170 50 220 / 0.6);
border-radius: 2rem;

<section class="default-example" id="default-example">
  <div class="transition-all" id="example-element">
    This is a box with an outline around it.
  </div>
</section>

#example-element {
  padding: 0.75rem;
  width: 80%;
  height: 100px;
}

Constituent properties

This property is a shorthand for the following CSS properties:

Syntax

/* style */
outline: solid;

/* style | color */
outline: dashed #ff6666;

/* width | style */
outline: thick inset;

/* width | style | color*/
outline: 3px solid green;

/* Global values */
outline: inherit;
outline: initial;
outline: revert;
outline: revert-layer;
outline: unset;

The outline property may be specified using one, two, or three of the values listed below. The order of the values does not matter. As with all shorthand properties, any omitted sub-values will be set to their initial value.

The outline will be invisible for many elements if its style is not defined. This is because the style defaults to none. A notable exception is input elements, which are given default styling by browsers.

Values

<'outline-width'>
- : A value setting the thickness of the outline. Defaults to medium if absent. See .
<'outline-style'>
- : Sets the style of the outline. Defaults to none if absent. See .
<'outline-color'>
- : Sets the color of the outline. Defaults to invert for browsers supporting it, currentColor for the others. See .

Description

Outline is a line outside of the element’s border. Unlike other areas of the box, outlines don’t take up space, so they don’t affect the layout of the document in any way.

There are a few properties that affect an outline’s appearance. It is possible to change the style, color, and width using the outline property, the distance from the border using the property, and corner angles using the property.

An outline is not required to be rectangular: While dealing with multiline text, some browsers will draw an outline for each line box separately, while others will wrap the whole text with a single outline.

Accessibility

Assigning outline a value of 0 or none will remove the browser’s default focus style. If an element can be interacted with it must have a visible focus indicator. Provide obvious focus styling if the default focus style is removed.

Formal definition

Formal syntax

Examples

Using outline to set a focus style

HTML

<a href="#">This link has a special focus style.</a>

CSS

a {
  border: 1px solid;
  border-radius: 3px;
  display: inline-block;
  margin: 10px;
  padding: 5px;
}

a:focus {
  outline: 4px dotted #ee7733;
  outline-offset: 4px;
  background: #ffffaa;
}