Day 70: the defined pseudo-class

This content originally appeared on Manuel Matuzović - Blog and was authored by Manuel Matuzović

:defined represents any element that has been defined. This includes standard elements and custom elements that have been successfully defined.

:defined {
  background-color: #000;
  color: #fff;
}

Standard elements

<p>I'm defined</p>
<small>I'm defined</small>

Undefined custom elements

<unde-fined>I'm not defined</unde-fined>

Defined custom elements

<de-fined>I'm defined</de-fined>

class BasicComponent extends HTMLElement {
  constructor() {
    super();
  }
}

customElements.define('de-fined', BasicComponent);

Deprecated elements

  <center>test</center>
  <font>test</font>
  <blink>test</blink>

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This content originally appeared on Manuel Matuzović - Blog and was authored by Manuel Matuzović

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