This is an example Heading

This is a example paragraph. Replace the HTML code on the left with your own.

What causes errors in HTML?

• Unclosed elements: If an element is not closed properly, then its effect can spread to areas you didn't intend
• Badly nested elements: Nesting elements properly is also very important for code behaving correctly. strong strong emphasized? what is this?
• Unclosed attributes: Another common source of HTML problems. Let's look at an example: link to Mozilla homepage