Day 70: the defined pseudo-class

: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>

I’m defined

I’m defined

Undefined custom elements

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

Defined custom elements

<de-fined>I'm defined</de-fined>
class BasicComponent extends HTMLElement {
constructor() {
super();
}
}

customElements.define('de-fined', BasicComponent);
I’m defined

Deprecated elements

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

: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>

I’m defined

I’m defined

Undefined custom elements

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

Defined custom elements

<de-fined>I'm defined</de-fined>
class BasicComponent extends HTMLElement {
constructor() {
super();
}
}

customElements.define('de-fined', BasicComponent);
I’m defined

Deprecated elements

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

test
test

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APA
Manuel Matuzović | Sciencx (2024-03-29T12:51:45+00:00) » Day 70: the defined pseudo-class. Retrieved from https://www.scien.cx/2022/12/30/day-70-the-defined-pseudo-class/.
MLA
" » Day 70: the defined pseudo-class." Manuel Matuzović | Sciencx - Friday December 30, 2022, https://www.scien.cx/2022/12/30/day-70-the-defined-pseudo-class/
HARVARD
Manuel Matuzović | Sciencx Friday December 30, 2022 » Day 70: the defined pseudo-class., viewed 2024-03-29T12:51:45+00:00,<https://www.scien.cx/2022/12/30/day-70-the-defined-pseudo-class/>
VANCOUVER
Manuel Matuzović | Sciencx - » Day 70: the defined pseudo-class. [Internet]. [Accessed 2024-03-29T12:51:45+00:00]. Available from: https://www.scien.cx/2022/12/30/day-70-the-defined-pseudo-class/
CHICAGO
" » Day 70: the defined pseudo-class." Manuel Matuzović | Sciencx - Accessed 2024-03-29T12:51:45+00:00. https://www.scien.cx/2022/12/30/day-70-the-defined-pseudo-class/
IEEE
" » Day 70: the defined pseudo-class." Manuel Matuzović | Sciencx [Online]. Available: https://www.scien.cx/2022/12/30/day-70-the-defined-pseudo-class/. [Accessed: 2024-03-29T12:51:45+00:00]
rf:citation
» Day 70: the defined pseudo-class | Manuel Matuzović | Sciencx | https://www.scien.cx/2022/12/30/day-70-the-defined-pseudo-class/ | 2024-03-29T12:51:45+00:00
https://github.com/addpipe/simple-recorderjs-demo