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Tuesday, February 3, 2026

📘 DAY 4: HTML ELEMENTS

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📘 DAY 4: HTML ELEMENTS 

1️⃣ What is an HTML Element?

An HTML element is the complete structure that includes:

  • Opening tag

  • Content

  • Closing tag

Example:

<p>This is a paragraph</p>

👉 This entire line is one HTML element.

2️⃣ Difference Between HTML Tag and HTML Element

This is a very common exam & interview question.

TagElement
<p><p>Hello</p>
<h1><h1>Heading</h1>
Only syntaxFull structure

✔ Tag → Part of element
✔ Element → Complete unit

3️⃣ Types of HTML Elements

HTML elements are mainly of two types:

🔹 1. Container (Paired) Elements

🔹 2. Empty (Unpaired) Elements

4️⃣ Container (Paired) Elements

These elements have:

  • Opening tag

  • Content

  • Closing tag

Examples:

<h1>Main Heading</h1>
<p>This is a paragraph</p>
<div>Container</div>

5️⃣ Empty (Unpaired) Elements

These elements do not have closing tags.

Examples:

<br>
<hr>
<img src="image.jpg">

👉 They perform specific actions (line break, image, line).

6️⃣ Nested HTML Elements

HTML elements can be inside other elements.

Example:

<html>
  <body>
    <p>This is <b>bold</b> text.</p>
  </body>
</html>

✔ This is called nested elements
✔ Nesting must be properly closed

https://s3.amazonaws.com/impressivewebs/ff-dom.jpg

7️⃣ Correct vs Incorrect Nesting

✅ Correct:

<p>This is <b>bold</b> text</p>

❌ Incorrect:

<p>This is <b>bold</p></b>

👉 Improper nesting can break layout.

8️⃣ Block-Level Elements

Block elements:

  • Start on a new line

  • Take full width

Examples:

<h1>
<p>
<div>
<ul>

9️⃣ Inline Elements

Inline elements:

  • Do not start new line

  • Take only required width

Examples:

<b>
<i>
<span>
<a>

🔟 Block vs Inline Elements (Comparison)

BlockInline
New lineSame line
Full widthContent width
Can contain inlineCannot contain block

1️⃣1️⃣ HTML Elements Are Case-Insensitive

These are same:

<P>Text</P>
<p>Text</p>

✔ But lowercase is recommended

1️⃣2️⃣ Elements Without Content

Some elements may have no content.

Example:

<hr>
<br>

👉 Still called elements

1️⃣3️⃣ Browser Handling of Elements

  • Browser ignores extra spaces

  • Browser auto-corrects some errors

  • Browser may still display output even if HTML is incorrect

👉 But do not rely on browser corrections

1️⃣4️⃣ Common Beginner Mistakes

❌ Confusing tag and element
❌ Incorrect nesting
❌ Forgetting closing tags
❌ Using block elements inside inline

1️⃣5️⃣ Practice Examples

Example 1:

<h1>HTML Elements</h1>
<p>This is a <b>paragraph</b>.</p>

Example 2:

<div>
  <h2>Title</h2>
  <p>Content</p>
</div>

1️⃣6️⃣ Interview / Viva Questions

  1. What is an HTML element?

  2. Difference between tag and element?

  3. What are empty elements?

  4. What is nesting?

  5. Difference between block and inline elements?

1️⃣7️⃣ Summary

  • HTML element is a complete unit

  • Tags are part of elements

  • Elements can be nested

  • Block and inline elements behave differently


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