how to deal with two super() in java script

Question

suppose i have two classes:

class A extends HTMLElement{
constructor(){
super(); //to access "this" of HTMLElement
}
}

class B extends A{
constructor(){
super(); //to access "this" of class A
}
}

but this shows error:

Illegal constructor
at new A (xyz.js:6) // saying that super() of class A is an illegal constructor
at new B(xyz.js:15) // saying the same as above
at xyz.js:23

plz help !!! how can i fix this .

Answer 1

you have to register your custom element in CustomElementRegistry using the define() method:
https://code.sololearn.com/Wbo21pXOB5ZV/#js

https://developer.mozilla.org/en-US/docs/Web/Web_Components/Using_custom_elements