The Outline Property 🖼

Today I learned about the CSS outline property.

Outlines are like borders, except they never take up space, because they're drawn outside of an element's content.

Some browsers have a default outline style for interactive elements (like buttons) on focus. This was how I came to learn about the property, because that style clashed visually with an element I was building.

Remove such an outline with either of these settings:

button:focus {
  outline: 0;
  outline: none;
}

Note that if an element can be interacted with, a11y best practices require a visible focus indicator. Provide obvious focus styling if the default focus style is removed.

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