Missing DOCTYPE declaration:
Unclosed tags:
Improper nesting of tags:
Missing alt text for images:
Using deprecated tags or attributes:
Using inline styles instead of CSS:
Incorrectly formatted links:
Using non-semantic markup:
Using tables for layout:
Ignoring accessibility:

Missing DOCTYPE declaration:

Solution: Add a DOCTYPE declaration to the top of your HTML document to specify the version of HTML you are using.

Unclosed tags:

Solution: Check that all tags have been closed correctly, using the appropriate opening and closing tags.

Improper nesting of tags:

Solution: Make sure that all tags are properly nested within each other, so that there are no overlapping or mismatched tags.

Missing alt text for images:

Solution: Add an alt attribute to all image tags, describing the image for users who cannot see it.

Using deprecated tags or attributes:

Solution: Replace deprecated tags or attributes with newer, more appropriate HTML elements.

Using inline styles instead of CSS:

Solution: Move inline styles into a separate CSS stylesheet, to make your HTML code cleaner and more maintainable.

Incorrectly formatted links:

Solution: Check that all links are formatted correctly, with the correct href attribute and a descriptive link text.

Using non-semantic markup:

Solution: Use semantic HTML elements to describe the content of your page, making it easier for search engines and assistive technology to understand.

Using tables for layout:

Solution: Use CSS for layout, instead of tables, to create more flexible and responsive designs.

Ignoring accessibility:

Solution: Follow accessibility best practices, including adding alt text to images, providing captions for videos, and making sure your site is keyboard-friendly.