Default Option :default

The :default pseudo-class matches all UI elements that are default among a set of similar elements. For example, the default button in a form, or the initially selected <option> in a <select> element.

Browser Support

Chrome Firefox Safari Opera IE Edge
Desktop yes yes yes yes no no
Mobile yes yes yes yes no no

Syntax

E:default {
/* Style properties */
}

Example

/* In this example, any default UI elements will have a green background. */

:default {
background-color: green;
}

Information is based on Selectors Level 4 - W3C Working Draft (last updated on May 2, 2013)
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