How would get HTML elements from a website? code example

Example 1: html semantic tags mozilla

These are some of the roughly 100 semantic elements available:

<article>
<aside>
<details>
<figcaption>
<figure>
<footer>
<header>
<main>
<mark>
<nav>
<section>
<summary>
<time>

Example 2: what is html element

Html is a markup kanguage based on XML. It uses nested <objects>
These objects are defined by the standards body W3C 
they are usually used in pairs ... <thing> </thing>
A .html file has a bunch of these tags
information to be displayed goes between the start and end  tags
 <p> This text is now a paragraph</p>
 Elements can have unique identifiers used by javascript and CSS
 <p id="fruit"> Apple Orange Banana </p>
 Elements can be styled by belonging to a class of Elements
  <p class="redThings"> This text will be colored red if "redThings" says so