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HTML, CSS, JavaScript
Learn the core web technologies—HTML, CSS, and JavaScript—and how the Internet, TCP/IP, DNS, and HTTP protocols power the web.
Lecture guide · Written by AI from the lecture. For the lecture’s own words, open the Transcript tab.
Introduces core web technologies, starting with the fundamentals of the Internet, TCP/IP protocols, IP addressing, DNS hierarchy, and HTTP request-response cycles. It then covers HTML for document structure, CSS for styling and layout, and JavaScript for dynamic browser interactivity.
Key Takeaways
- The internet routes packets using IP for addressing and TCP for guaranteed delivery and port multiplexing.
- HTML uses tags and attributes to structure content, support multimedia, and build interactive forms.
- CSS applies style properties via inline attributes, style tags, or external style sheets using selectors.
- JavaScript interacts with the Document Object Model (DOM) to update web pages dynamically and handle browser events.
Concepts Explained52
TCP/IP—A pair of protocols that the internet generally uses nowadays to get data from point A to point B.
IP address—A unique string of numbers formatted as four numbers between 0 and 255 that uniquely identifies a computer or internet-connected device.
IP (Internet Protocol)—IP standardizes what you put on the outside of packets, specifically requiring every computer to have a unique address.
TCP (Transmission Control Protocol)—TCP is a protocol used in conjunction with IP that guarantees delivery using sequence numbers and multiplexes applications using port numbers.
Examples, Proofs & Derivations