HTML Summary

HTML (HyperText Markup Language) is the most basic building block of the Web. It defines the meaning and structure of web content. You don't use it for styling purposes. Use CSS for that instead!

• HTML uses "elements" to describe (annotate) content.
• HTML elements typically have an opening tag, content and then a closing tag.
• You can also have void (empty) elements like images.
• You can also configure elements with attributes.
• There's a long list of available elements but you'll gain experience over time, no worries.

Learn more about all available HTML elements on the MDN HTML elements references.

CSS Summary

Cascading Style Sheets (CSS) is a stylesheet language used to describe the presentation of a document written in HTML or XML.

• Styles are assigned via property-value pairs.
• You can assign style via the "style" attribute.
• To avoid code duplication, you typically use global styles (e.g. via the "style" element) instead.
• Alternatively, you can work with external stylesheet files which you "link" to.
• When working with CSS, concepts like "inheritance", "specificity" and the "box model" should be understood.

Learn more about all available CSS properties and values on the MDN CSS Properties references.