HTML Document

First HTML Example :

<!DOCTYPE html>
<html>
<body>
<h1>This is Heading</h1>
<p>This is Paragraph</p>
</body>
</html>

Explanation of Example :

Tag Explanation 
<!DOCTYPE html>
This will define HTML document 
<html> and </html>
Text between html tag will describe the webpage 
<body> and </body>
Text between the body tag is only visible content on the webpage 
<h1> and </h1>
Text between the h1 tag displays Heading 
<p> and </p>
Text between the p tag displays paragraph

First Look at HTML Tag :

  1. Web Page Consists of HTML tags.
  2. HTML tag is basic building block of Web Page.
  3. HTML Tags are Keywords surrounded with starting angular bracket and closing angular bracket
  4. Generally each Tag comes in a pair except some non closing tags.
  5. Starting Tag is also known as “Opening Tag“.
  6. Ending Tag is also known as “Closing Tag“.

Structure of HTML Document :

Structure of HTML

HTML Elements can be nested :

HTML tags can be nested. One HTML Element can have other HTML elements inside it. e.g -

<body>
    <h1><b>This is a Heading</b></h1>
    <b>Text is bold</b>
</body>

in the above HTML markup, We have nested the HTML elements.

HTML Documents are Case-Insensitive :

We can write HTML code in either cases i.e in Uppercase or in lowercase.

<h1><b>This is a Heading</b></h1>

and

<H1><b>This is a Heading</B></h1>

both of the above lines will print same result.