Clean HTML Structure.

Writing 'clean' HTML means following standards and conventions that make your code easy to read, maintain, and debug for yourself and other developers.

The Essentials

Use consistent indentation (usually 2 or 4 spaces).

Always use lowercase for tag names and attributes.

Always close all tags, even if the browser allows otherwise.

Use double quotes for attribute values.

Keep your code organized with comments for large sections.

Avoid unnecessary nesting and 'div-itis'.

Professional Insights

Indentation and Nesting

Proper indentation allows you to see the hierarchy of the document at a glance. It makes it obvious when a tag is missing its closing counterpart.

Naming Conventions

Use descriptive and consistent names for classes and IDs. Avoid cryptic names like 'c1' or 'container-inner-final-2'. Use kebab-case (e.g., 'main-navigation').

The DRY Principle

Don't Repeat Yourself. If you find yourself writing the same inline styles or complex structures multiple times, consider moving them to a shared class.

Code Validation

Use the W3C Markup Validation Service to check your code for errors. Professional developers aim for zero warnings and zero errors.

Critical Pitfalls

Inconsistent indentation, making the code look messy and unprofessional.

Leaving out optional closing tags (like </li> or </p>), which can lead to bugs.

Using inline styles instead of separating structure from design.

Using spaces instead of hyphens in class or ID names.

Interactive Lab

Sprint Tasks

Clean up the messy code below

Fix the indentation and ensure all tags are closed correctly

Change the tag name to lowercase

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