:has-slotted CSS pseudo-class

The :has-slotted CSS pseudo-class matches when the content of a <slot> element is not empty or not using the default value (see Using templates and slots for more information).

Note: Even a single whitespace text node is sufficient to make :has-slotted apply.

This only works when used inside CSS placed within a shadow DOM.

css
/* Selects the content of a <slot> element that has content that is not default  */
:has-slotted {
  color: green;
}

/* Selects the content of a <slot> element that has no content or default  */
:not(:has-slotted) {
  color: red;
}

Syntax

css
:has-slotted {
  /* ... */
}

Examples

This example has two <slot> elements, one of which has been assigned some content and the other has not.

HTML

html
<p>
  <template shadowrootmode="open">
    <style>
      :has-slotted {
        color: rebeccapurple;
      }
    </style>
    <slot name="one">Placeholder 1</slot>
    <slot name="two">Placeholder 2</slot>
  </template>
  <span slot="one">Slotted content</span>
</p>

Result

The <slot> element that has been assigned content matched the :has-slotted pseudo-class and has the color value of rebeccapurple applied.

Specifications

See also