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@@ -6,6 +6,112 @@
 
 HTML is a markup language that provides the structure of the page, while CSS is used to control the presentation, formatting, and layout.
 
-## Slides
+## Web Application: Intro to HTML and CSS
 
-See [Introduction to HTML and CSS](https://docs.google.com/presentation/d/e/2PACX-1vRsRuQHKrnww0mOBF5iqUyisAyCHje9WYV4XRVzSlntk4wqeaUOB8OwO3Ajy9BPKhe-kS6UNoAwcH8e/pub?start=false&loop=false&delayms=60000) to find out more about these two languages.
+### HyperText Markup Language (HTML): Defines Structure and Content of a Webpage
+
+HTML is a **standard markup language** for describing web documents (web pages).
+
+In 1989, Tim Berners-Lee invented the Web with HTML as its publishing language.
+HTML (HyperText Markup Language) was created to help programmers describe the content on a website.
+
+HTML uses **nested tags** to help you add paragraphs, headers, pictures, bullets and other pieces of structure for **semantic markup** of a document.
+
+**Further reading:** [Introduction to HTML](https://www.w3schools.com/html/html_intro.asp), [HyperText Markup Language](https://developer.mozilla.org/en-US/docs/Web/HTML)
+
+#### HTML tags
+
+Content on a webpage is generally **enclosed** in tags that look like `<div></div>`.
+
+These tags demarcate HTML elements that are placed on the page.
+
+**Some basic tags:**
+
+The HTML document: `<html>`
+
+**Page sections:**   `<head>`, `<header>`, `<nav>`, `<main>`, `<body>`, `<footer>`, ...
+
+**Headers:**         `<h1>`, `<h2>`, `<h3>`, ..., `<h6>`
+
+**Text elements:**   `<title>`, `<p>`, `<br>`, `<hr>`, ...
+
+HTML elements can be nested inside each other, with some exceptions.
+
+#### Using DevTools
+
+DevTools is a powerful "debugger" for web programming and scripting, used by students and professionals alike. It is invoked using the `<Ctrl+Shift+C>` hotkey.
+
+For this task, we will use NYJC's official website: https://www.nanyangjc.moe.edu.sg/
+
+As you browse the page, right-click on different elements and click **Inspect**. What do you see?
+
+### Cascading Style Sheets (CSS): Controls the visual presentation and styling of content
+
+#### CSS: Cascading Style Sheets
+
+CSS describes how HTML elements are to be displayed on screen, paper, or in other media.
+
+**CSS** was first proposed by Hakom Lie and co-created by Bert Bos around 1996. **Created to compliment HTML, CSS** (Cascading Style Sheets) is what **makes a website look and feel amazing**. Presentation and ease of use have been some of the qualities CSS has brought to web development. It is more **involved with changing** a website’s **style rather than** its **content**.
+
+Similar to how changing the font size, font color and positioning on a word document helps with its styling and display, CSS applies **styling rules** to define how the content looks on a webpage and what else goes on to complement that content.
+
+**Further reading:** [Cascading Style Sheets](https://developer.mozilla.org/en-US/docs/Web/CSS), [Selectors](https://developer.mozilla.org/en-US/docs/Learn_web_development/Core/Styling_basics/Basic_selectors)
+
+#### Exploration
+
+Head back to NYJC’s oﬃcial website:
+https://www.nanyangjc.moe.edu.sg/
+
+**Task:**
+
+● **Inspect** the various elements on the webpage.
+
+● **Uncheck** certain **property-value pairs** in the **Styles Panel**. What do you see?
+
+● Continue exploring the selectors in the **Styles Panel**; change the property values to see the corresponding changes in the webpage.
+
+## CHECKPOINT
+
+### Final Task for the lesson
+
+Head to the website:
+https://www.lipsum.com/
+
+Task:
+
+● Using the **DevTools**, alter the HTML such that the adverts are not visible and the page is suitable for print, as shown.
+
+Original
+
+![alt text](image-1.jpeg)
+
+Final
+
+![alt text](image.jpeg)
+
+### Self-study
+
+**Before the lab session:**
+Revise the Notes: [HyperText Markup Language (HTML)](https://docs.google.com/document/d/1zsf3OKFuIKi9SgvS3mflEWCJs7bN8N6NT07MMgjVa5E/edit?tab=t.0#heading=h.uofmalyg35wi), [Cascading Style Sheets (CSS)](https://docs.google.com/document/d/1zsf3OKFuIKi9SgvS3mflEWCJs7bN8N6NT07MMgjVa5E/edit?tab=t.0#heading=h.4zpwrve0iwkt)
+
+Take the [quiz on W3Docs.com](https://www.w3docs.com/quiz-start/html-basic)
+
+**When you have the time:**
+
+Complete MDN’s [Getting Started with HTML](https://developer.mozilla.org/en-US/docs/Learn_web_development/Core/Structuring_content/Basic_HTML_syntax), [Document and website structure](https://developer.mozilla.org/en-US/docs/Learn_web_development/Core/Structuring_content/Structuring_documents).
+
+Check out the handy [HTML Cheat sheet](https://drive.google.com/file/d/1sYvaCUrSLdK8llDFqXIaks7OMUS5uHQi/view?usp=drivesdk)
+
+Take a peek at the online [HTML & CSS Interactive Cheat Sheet](https://htmlcheatsheet.com/)
+
+### Next Lesson
+
+HTML/CSS for Github portfolio
+- Create a GitHub page and portfolio
+
+If you are struggling, remember:
+Some developers dedicate their **entire careers** to mastering HTML, CSS, and Javascript.
+
+You are learning and using *the same language* as these professionals.
+
+**You are not expected to know everything at one go!**
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