html
html
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<!DOCTYPE html>
<html>
<head>
<title>create group with elements object entity and relation.</title>
</head>
<body>
<script>
class Heading {
constructor (value) {
this.value = value ;
}
value () {
return this.value;
}
}
class Myheading extends Heading {
constructor (value,color) {
super (value);
this.color = color ;
}
color () {
return this.color ;
}
}
class BackgroundColor extends Heading {
constructor (value,backgroundColor) {
super (value);
this.backgroundColor = backgroundColor ;
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css
css
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body {
}
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js
js
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