The Giant Robot

I wake up in this weird-looking room where I immediately get approached by a giant robot with the letters HTML on its chest.

HTML, the planet's elder summoned us all for a meeting under the Sacred Tree. 🤖 1 I'm HTML, you've probably met my grandson, HTML5. We're both from the Markup tribe and we make up the content of pages on the web.
Document Object Model (DOM) describes the structure browsers use to represent HTML elements internally.

Parents

Children

Nodes

Elements

Pseudo Elements

The Elements Tab

Expanding Recursively

Collapse Children

Visibility

Element State