DOM div in div

UK contains England

let a = document.createElement('div');
a.innerHTML = 'UK';
let b = document.createElement('div');
b.innerHTML = 'England';
document.body.append(a);
a.append(b);


let css = document.createElement('style');
document.head.append(css);
css.innerText = `
div{
  border:solid;
  padding: 1ex;
  margin: 1ex;
}
`;

let a = document.createElement('div');
a.innerHTML = 'UK';
let b = document.createElement('div');
b.innerHTML = 'England';
document.body.append(a);
a.append(b);


let css = document.createElement('style');
document.head.append(css);
css.innerText = `
div{
  border:solid;
  padding: 1ex;
  margin: 1ex;
}
`;

UK contains England, England contains London

let a = document.createElement('div');
a.innerHTML = 'A';
let b = document.createElement('div');
b.innerHTML = 'B';
document.body.append(a);
a.append(b);


let css = document.createElement('style');
document.head.append(css);
css.innerText = `
div{
  border:solid;
  padding: 1ex;
  margin: 1ex;
}
`;

let a = document.createElement('div');
a.innerHTML = 'UK';
let b = document.createElement('div');
b.innerHTML = 'England';
let c = document.createElement('div');
c.innerHTML = 'London';
document.body.append(a);
a.append(b);
b.append(c);


let css = document.createElement('style');
document.head.append(css);
css.innerText = `
div{
  border:solid;
  padding: 1ex;
  margin: 1ex;
}
`;

UK contains England and Scotland

let a = document.createElement('div');
a.innerHTML = 'A';
let b = document.createElement('div');
b.innerHTML = 'B';
document.body.append(a);
a.append(b);


let css = document.createElement('style');
document.head.append(css);
css.innerText = `
div{
  border:solid;
  padding: 1ex;
  margin: 1ex;
}
`;

let a = document.createElement('div');
a.innerHTML = 'UK';
let b = document.createElement('div');
b.innerHTML = 'England';
let c = document.createElement('div');
c.innerHTML = 'Scotland';
document.body.append(a);
a.append(b);
a.append(c);


let css = document.createElement('style');
document.head.append(css);
css.innerText = `
div{
  border:solid;
  padding: 1ex;
  margin: 1ex;
}
`;

A and B, A contains C

let a = document.createElement('div');
a.innerHTML = 'A';
let b = document.createElement('div');
b.innerHTML = 'B';
document.body.append(a);
a.append(b);


let css = document.createElement('style');
document.head.append(css);
css.innerText = `
div{
  border:solid;
  padding: 1ex;
  margin: 1ex;
}
`;

let a = document.createElement('div');
a.innerHTML = 'England';
let b = document.createElement('div');
b.innerHTML = 'Scotland';
let c = document.createElement('div');
c.innerHTML = 'London';
document.body.append(a);
document.body.append(b);
a.append(c);


let css = document.createElement('style');
document.head.append(css);
css.innerText = `
div{
  border:solid;
  padding: 1ex;
  margin: 1ex;
}
`;

UK contains England and Scotland, Scotland contains Edinburgh

let a = document.createElement('div');
a.innerHTML = 'A';
let b = document.createElement('div');
b.innerHTML = 'B';
document.body.append(a);
a.append(b);


let css = document.createElement('style');
document.head.append(css);
css.innerText = `
div{
  border:solid;
  padding: 1ex;
  margin: 1ex;
}
`;

let uk = document.createElement('div');
let en = document.createElement('div');
let sc = document.createElement('div');
let ed = document.createElement('div');
uk.innerHTML = 'UK';
en.innerHTML = 'England';
sc.innerHTML = 'Scotland';
ed.innerHTML = 'Edinburgh';
document.body.append(uk);
uk.append(en);
uk.append(sc);
sc.append(ed);


let css = document.createElement('style');
document.head.append(css);
css.innerText = `
div{
  border:solid;
  padding: 1ex;
  margin: 1ex;
}
`;