Why Avoiding deprecated tags in HTML? - Purpose & Use Cases

The Big Idea

What if your website breaks on new browsers just because of old tags?

The Scenario

Imagine you are building a website and want to make some text bold or center an image. You use old tags like <center> or <font> because they seem easy and quick.

The Problem

Later, your site looks strange on new browsers or devices. The old tags don't work well or cause accessibility problems. You also find it hard to update styles consistently because these tags mix content with design.

The Solution

Modern HTML uses semantic tags and CSS for styling. This keeps content and design separate, making your site easier to maintain, more accessible, and future-proof.

Before vs After

✗ Before

<center>Welcome!</center>

✓ After

<div style="text-align:center;">Welcome!</div>

What It Enables

You can create websites that work well everywhere, are easier to update, and help all users, including those using screen readers.

Real Life Example

A news website updates its look by changing CSS styles only, without touching HTML content, because it avoided deprecated tags.

Key Takeaways

Deprecated tags mix content and style, causing problems.

Using modern HTML and CSS separates concerns for better design.

This leads to accessible, maintainable, and future-ready websites.

Practice

1. Which of the following tags is deprecated and should be avoided in modern HTML?

easy

A. <article>

B. <center>

C. <section>

D. <nav>

Solution

1. Step 1: Understand deprecated tags

   The <center> tag was used to center content but is now deprecated in favor of CSS styling.

2. Step 2: Identify semantic tags

   <section>, <article>, and <nav> are semantic HTML5 tags and are not deprecated.

3. Final Answer:

   <center> -> Option B

4. Quick Check:

   Deprecated tag = <center> [OK]

Hint: Deprecated tags are old layout tags replaced by CSS [OK]

Common Mistakes:

• Confusing semantic tags with deprecated tags
• Thinking all tags with angle brackets are deprecated
• Assuming <b> is semantic

2. Which is the correct modern way to make text bold instead of using the deprecated <b> tag?

easy

A. <i>Text</i>

B. <bold>Text</bold>

C. <em>Text</em>

D. <strong>Text</strong>

Solution

1. Step 1: Identify semantic bold tag

   The <strong> tag is the semantic way to indicate important or bold text.

2. Step 2: Recognize deprecated and incorrect tags

   <b> is deprecated for styling; <bold> is invalid; <em> and <i> are for emphasis and italic style, not bold.

3. Final Answer:

   <strong>Text</strong> -> Option D

4. Quick Check:

   Use <strong> for bold text [OK]

Hint: Use semantic tags like strong for bold, not <b> [OK]

Common Mistakes:

• Using <b> for styling instead of <strong>
• Confusing <em> with bold
• Using invalid tags like <bold>

3. What will the following HTML code render in a modern browser?

<center><h1>Welcome</h1></center>

medium

A. The heading 'Welcome' centered horizontally

B. The heading 'Welcome' left aligned (default)

C. A syntax error, page won't load

D. The heading 'Welcome' in italic style

Solution

1. Step 1: Recognize deprecated tag behavior

   Although the <center> tag is deprecated in HTML5, modern browsers continue to support it for backward compatibility and will center the content.

2. Step 2: Default heading alignment

   The <h1> inside <center> will be rendered centered horizontally.

3. Final Answer:

   The heading 'Welcome' centered horizontally -> Option A

4. Quick Check:

   Deprecated <center> still centers [OK]

Hint: Deprecated tags like <center> still render their effect in modern browsers [OK]

Common Mistakes:

• Thinking deprecated tags are completely ignored
• Believing deprecated tags cause syntax errors
• Confusing <center> with italic or bold

4. Identify the error in this HTML snippet and choose the best fix:

<font color='red'>Warning!</font>

medium

A. Replace <font> with <span> and use CSS color

B. Keep <font> but add style attribute

C. Change color attribute to text-color

D. Use <b> instead of <font>

Solution

1. Step 1: Recognize deprecated tag usage

   The <font> tag is deprecated and should not be used for styling.

2. Step 2: Use semantic tag with CSS

   Use a <span> tag and apply color with CSS, e.g., style="color:red;".

3. Final Answer:

   Replace <font> with <span> and use CSS color -> Option A

4. Quick Check:

   Use CSS for styling, not <font> [OK]

Hint: Use <span> + CSS instead of deprecated <font> [OK]

Common Mistakes:

• Trying to fix <font> with invalid attributes
• Using <b> for color styling
• Ignoring CSS for styling

5. You want to center a paragraph and make its text italic without using deprecated tags. Which is the best modern HTML and CSS approach?

hard

A. <center><i>Text</i></center>

B. <p><font align='center'><i>Text</i></font></p>

C. <p style='text-align:center; font-style:italic;'>Text</p>

D. <p><b><em>Text</em></b></p>

Solution

1. Step 1: Avoid deprecated tags

   <center> and <font> are deprecated and should not be used.

2. Step 2: Use CSS for styling

   Apply text-align:center; and font-style:italic; using the style attribute or external CSS on a semantic tag like <p>.

3. Final Answer:

   <p style='text-align:center; font-style:italic;'>Text</p> -> Option C

4. Quick Check:

   Use CSS styles, not deprecated tags [OK]

Hint: Use CSS styles on semantic tags, never deprecated tags [OK]

Common Mistakes:

• Using <center> or <font> for layout and style
• Mixing bold and italic tags incorrectly
• Not applying CSS for alignment or style