Saturday, November 8, 2025

Full Hugging Face with Python syllabus only covering Python parts that are directly relevant to Hugging Face usage (so no generic Python basics, since you’ll cover those separately).

Hugging Face with Python – Full Hands-On Syllabus


Section 1 – Introduction & Setup

Goal: Understand Hugging Face ecosystem, install and set up environment.

  1. What is Hugging Face?

    • Transformers library

    • Datasets library

    • Tokenizers library

    • Model Hub

    • Spaces

  2. Installation & Environment Setup

    • Installing transformers, datasets, huggingface_hub, evaluate

    • Python virtual environments (venv, conda) for HF projects

    • Setting up a free Hugging Face account and API token

  3. First Hands-on: Load a pre-trained model and tokenizer.

    from transformers import pipeline
    classifier = pipeline("sentiment-analysis")
    print(classifier("Hugging Face is awesome!"))
    

Mini Project:
Sentiment Analyzer – User enters text, script returns positive/negative with confidence score.


Section 2 – Transformers Fundamentals

Goal: Learn model loading, tokenization, pipelines, and inference.

  1. Pre-trained Models & Pipelines

    • Text classification

    • Named Entity Recognition (NER)

    • Question Answering

    • Text Generation

  2. Tokenizer Basics

    • Tokenization process (subword, wordpiece, BPE)

    • Encoding and decoding text

    • Padding, truncation, attention masks

  3. Hands-on Exercises:

    • Load different models from transformers

    • Tokenize custom text and see token IDs

    • Decode token IDs back to text

Mini Project:
Custom NER Tool – Extract names, locations, and organizations from text.


Section 3 – Working with Hugging Face Datasets

Goal: Learn to load, explore, preprocess, and split datasets.

  1. Datasets Basics

    • Loading built-in datasets (IMDB, SQuAD, etc.)

    • Loading CSV/JSON from local or URL

    • Dataset structure: features, splits, metadata

  2. Data Processing

    • Filtering, mapping, and formatting datasets

    • Tokenizing entire datasets efficiently (map with batched processing)

    • Train/validation/test split

  3. Hands-on:

    • Load IMDB reviews dataset

    • Preprocess for classification task

Mini Project:
Text Cleaner & Preprocessor – Load dataset, clean text, tokenize, and prepare for model training.


Section 4 – Fine-tuning Pre-trained Models

Goal: Learn to train and fine-tune models for custom tasks.

  1. Training Setup

    • Understanding AutoModelForSequenceClassification

    • Trainer API basics

    • TrainingArguments configuration

  2. Fine-tuning Steps

    • Load dataset → Tokenize → Model definition → Trainer → Train

    • Saving and loading fine-tuned models

  3. Hands-on:

    • Fine-tune BERT for sentiment classification

    • Evaluate using evaluate library

Mini Project:
Movie Review Sentiment Classifier – Fine-tune BERT on IMDB dataset.


Section 5 – Advanced Fine-tuning & Customization

Goal: Handle larger models, optimize training, and customize architectures.

  1. Training Optimization

    • Mixed precision training

    • Gradient accumulation

    • Data collators for dynamic padding

  2. Custom Models

    • Modify architecture layers

    • Use AutoModel for non-classification tasks

  3. Saving & Sharing Models

    • Push to Hugging Face Hub with API token

    • Load directly from Hub in another project

Mini Project:
Custom Toxic Comment Detector – Fine-tune DistilBERT with additional custom classification layers.


Section 6 – Beyond NLP: Vision & Audio Models

Goal: Explore non-text models in Hugging Face.

  1. Image Models

    • Image classification pipeline (vit, resnet)

    • Image segmentation

  2. Audio Models

    • Speech-to-text (whisper)

    • Audio classification

  3. Hands-on:

    • Classify images using pipeline("image-classification")

    • Convert speech to text

Mini Project:
Speech Sentiment Detector – Convert audio to text, run sentiment analysis.


Section 7 – Deployment & Integration

Goal: Deploy and use models in real applications.

  1. FastAPI Integration – Create REST API for HF models

  2. Streamlit/Gradio Apps – Interactive UIs

  3. Hugging Face Spaces Deployment – Free hosting for models and apps

Mini Project:
Text Summarization Web App – Users paste an article, model outputs a summary.


Section 8 – Advanced Topics & Research

Goal: Explore cutting-edge Hugging Face features.

  1. PEFT & LoRA – Parameter-efficient fine-tuning for large models

  2. Transformers for RAG – Retrieval-Augmented Generation with transformers + faiss

  3. Multi-task models – Train one model for multiple tasks

  4. Quantization & Model Optimization – Run large models on small hardware

Capstone Project Ideas:

  • AI Customer Support Bot (QA + summarization + sentiment analysis)

  • RAG-based PDF Question Answering System (LangChain + HF models)

  • Multi-modal AI (text + image inputs)


📌 Teaching Flow Tip:

  • Start each section with concepts, then code-along examples, then a small hands-on task.

  • Include model training on free Google Colab to keep costs zero.

  • End with a capstone project combining multiple Hugging Face capabilities.




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Section 1 – Introduction & Setup detailed notes in point format so they’re ready for Hugging Face

Section 1 – Introduction & Setup

Goal: Students understand what Hugging Face is, its ecosystem, and can set up a Python environment to start using it.


1.1 What is Hugging Face?

  • Definition:

    • Hugging Face is an AI/ML platform and open-source ecosystem for Natural Language Processing (NLP), Computer Vision (CV), and Speech tasks.

    • Focuses on transformer-based models for deep learning.

  • Core Components:

    1. Transformers Library

      • Python library for loading, training, and using pre-trained models.

      • Supports NLP, Vision, Audio, and Multimodal tasks.

      • Example tasks: Sentiment Analysis, Text Generation, Question Answering.

    2. Datasets Library

      • Ready-to-use datasets for training and testing models.

      • Efficient streaming and processing of large datasets.

    3. Tokenizers Library

      • Fast, language-specific text tokenization.

      • Implements modern tokenization algorithms like BPE, WordPiece, Unigram.

    4. Hugging Face Hub

      • Public repository for pre-trained models and datasets.

      • You can push your own models/datasets and share them.

    5. Spaces

      • Free hosting for AI apps (Gradio, Streamlit) connected to HF models.

  • Why Hugging Face is Popular:

    • Large collection of ready-to-use models.

    • Easy integration with PyTorch and TensorFlow.

    • Active community & free resources.


1.2 Installation & Environment Setup

  • Prerequisites:

    • Python 3.8+ installed.

    • Basic understanding of Python syntax.

  • Step 1: Create a Virtual Environment

    • Keeps dependencies isolated from other projects.

    python -m venv hf_env
    source hf_env/bin/activate   # Mac/Linux
    hf_env\Scripts\activate      # Windows
    
  • Step 2: Install Hugging Face Libraries

    pip install transformers datasets tokenizers evaluate huggingface_hub
    
  • Step 3: Optional – GPU Setup for Faster Processing

    • Install PyTorch or TensorFlow with GPU support (CUDA).

    • Example for PyTorch:

      pip install torch torchvision torchaudio --index-url https://download.pytorch.org/whl/cu118
      
  • Step 4: Create a Hugging Face Account

  • Step 5: Login via CLI (Optional for Model Upload)

    huggingface-cli login
    

1.3 First Hands-on – Load a Pre-trained Model

  • Using Pipeline API:

    from transformers import pipeline
    classifier = pipeline("sentiment-analysis")
    result = classifier("Hugging Face is awesome!")
    print(result)
    # [{'label': 'POSITIVE', 'score': 0.9998}]
    
  • Concepts Introduced:

    • Pipeline: High-level API for running models without detailed setup.

    • Task Name: "sentiment-analysis", "text-generation", "translation", etc.

    • Output: Structured dictionary with labels and scores.


1.4 Mini Project – Simple Sentiment Analyzer

  • Description:

    • Take user input from the console.

    • Pass it to the Hugging Face sentiment analysis pipeline.

    • Output sentiment & confidence score.

  • Code Example:

    from transformers import pipeline
    
    sentiment_pipeline = pipeline("sentiment-analysis")
    
    while True:
        text = input("Enter text (or 'quit' to exit): ")
        if text.lower() == "quit":
            break
        result = sentiment_pipeline(text)[0]
        print(f"Sentiment: {result['label']}, Confidence: {result['score']:.2f}")
    
  • Learning Outcomes:

    • Running pre-trained models in Python.

    • Understanding HF’s high-level workflow.

    • Introduction to model inference without training.




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✅ Interim Report Assistance

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✅ Complete Final-Year Project System (Fully Working)

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Hugging Face Website – Beginner Explanation very simple beginner-friendly language so that even if you are new, you can understand Hugging Face step by step. Think of Hugging Face as a big online library + playground for AI and Machine Learning.

 Perfect 👌 I’ll explain everything in 


🌍 


🔹 1. Models – Main

  • Imagine a supermarket for AI models.

  • Here, you can find ready-made brains (AI models) trained by experts.

  • You don’t always need to train a model yourself — you can just pick one and use it.

  • Example:

    • Want to translate English → Sinhala? → Use a translation model.

    • Want to recognize objects in pictures? → Use an image model.

👉 Models save you time because someone already did the hard work of training.


🔹 2. Tasks

  • “Tasks” are simply what job you want the AI to do.

  • Example tasks:

    • NLP (Text) → translate text, summarize text, answer questions, chatbots.

    • Vision (Images) → identify cats/dogs, detect objects, generate images.

    • Audio (Sound) → convert speech → text, or text → speech.

  • Hugging Face organizes models by tasks so beginners can just say:
    “I want summarization” → it shows you all models that can summarize.


🔹 3. Libraries

  • These are toolkits that help you use models easily in Python.

  • Main Hugging Face libraries:

    • Transformers → Use pre-trained models for text, images, and audio.

    • Datasets → Load and use huge datasets with 1 line of code.

    • Tokenizers → Break down text into smaller pieces (important for AI).

    • Diffusers → Generate images with AI (like Stable Diffusion).

    • Accelerate → Helps train models faster on GPU/TPU.

👉 Think of libraries as apps in your phone → each one helps with a specific thing.


🔹 4. Languages

  • There are two types of languages here:

    1. Programming languages → Most models are used with Python.

    2. Human languages → Models are tagged with languages they understand.

      • Example: Some models only work in English, some in Sinhala, Tamil, Hindi, etc.

👉 So, if you need a Sinhala speech recognition model → you can filter by language.


🔹 5. Licenses

  • A license tells you what you are allowed to do with a model or dataset.

  • Some are open and free (MIT, Apache 2.0).

  • Some have rules (CC-BY → give credit, Non-commercial → not for business use).

  • Example:

    • If you are making a personal project → most open-source models are fine.

    • If you are building a business → you must check the license.

👉 Always check the license before using a model in a company project.


🔹 6. Other

  • This is like the extra features section of Hugging Face.

  • Includes:

    • Leaderboards → Which models are best at a certain task.

    • Collections → Groups of models/datasets.

    • Papers → Research connected to models.

  • Helps you see which model is most accurate or popular.


🔹 7. Datasets

  • A dataset = collection of data used to train or test AI.

  • Hugging Face has a Datasets Hub → you can download thousands of datasets.

  • Examples:

    • IMDB movie reviews (for sentiment analysis).

    • Wikipedia (for text understanding).

    • ImageNet (for image recognition).

  • Instead of searching on the internet, Hugging Face gives you ready-to-use datasets.

👉 You can directly load them with Python code.


🔹 8. Spaces

  • Spaces = Mini websites/apps where people share live demos of their AI models.

  • Made with Gradio or Streamlit (simple Python tools).

  • Example Spaces:

    • A chatbot you can talk to.

    • An image generator where you type text, and it makes a picture.

    • A speech-to-text demo where you upload audio, and it gives text.

👉 You don’t need to install anything — just click and try it.


🔹 9. Community

  • Hugging Face is not just tools — it’s also a big community of AI learners and experts.

  • Community includes:

    • Discussions & forums → Ask questions, get answers.

    • Organizations → Teams or companies sharing their models.

    • Contributions → You can also upload your model/dataset and share.

👉 If you’re stuck, the community can help you learn and grow.


🎯 Beginner Summary (Super Simple)

  • Models → Ready-made AI brains.

  • Tasks → Jobs for AI (translate, summarize, detect objects, etc.).

  • Libraries → Toolkits like Transformers, Datasets, Diffusers.

  • Languages → Models tagged by human & programming language.

  • Licenses → Rules for using models.

  • Other → Extra features (leaderboards, papers).

  • Datasets → Collections of data for AI.

  • Spaces → Free apps/demos to try AI.

  • Community → People to learn and share with.


👉 Would you like me to also create a real-life analogy (like comparing Hugging Face to a “School” or “Supermarket”) so you can remember these 9 sections more easily?

🚀 What is a Pipeline in Hugging Face? Tutorials Classes Examples

🚀 What is a Pipeline in Hugging Face?

A pipeline is like a shortcut tool in Hugging Face that lets you use powerful AI models with just a few lines of code, without worrying about all the technical setup.

👉 Think of it as a ready-made machine:

  • You give input → It processes with a model → You get output.

  • No need to manually load models, tokenizers, or preprocess data.


🛠️ Example in Real Life:

Imagine you go to a juice shop:

  • You give fruits (input).

  • The shop’s juicer (pipeline) automatically washes, peels, and squeezes.

  • You get juice (output).

You don’t need to know how the juicer works inside — just enjoy the juice.
Similarly, Hugging Face pipelines let you focus on results, not coding complexity.


🖥️ Example in Hugging Face (Python code):

from transformers import pipeline

# Create a pipeline for sentiment analysis
classifier = pipeline("sentiment-analysis")

# Give it text
result = classifier("I love Hugging Face, it's amazing!")

print(result)

✅ Output:

[{'label': 'POSITIVE', 'score': 0.9998}]

👉 Here:

  • Task: Sentiment Analysis (find if text is positive/negative).

  • Pipeline: Handles everything (loading model + tokenizer + processing).

  • Result: It tells you the text is positive with 99% confidence.


🔹 Types of Pipelines (Tasks you can run)

Some common Hugging Face pipelines are:

  • "sentiment-analysis" → Positive or negative feeling.

  • "text-generation" → Continue writing text (like GPT).

  • "translation" → Translate text between languages.

  • "summarization" → Summarize long text into short.

  • "question-answering" → Ask a question, get an answer from text.

  • "image-classification" → Detect what’s in a picture.

  • "automatic-speech-recognition" → Convert speech → text.


🎯 Why is Pipeline Useful for Beginners?

  • ✅ Very easy to use (few lines of code).

  • ✅ No need to understand all internal details.

  • ✅ Great for trying out models quickly.

  • ✅ Supports many different tasks.

Later, if you want more control and customization, you can directly use AutoModel and AutoTokenizer. But for starting, pipeline is the easiest entry point.



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Tuesday, September 16, 2025

GCE A/L ICT – Unit 1 (Competency 1.1) Sri Lanka Schools AL ICT Basic Concepts of ICT (ICT Grade 12 Lesson 1 )

📘 GCE A/L ICT – Unit 1 (Competency 1.1)

Topic: Investigates the basic building blocks of information and their characteristics


🔹 1. Data Life Cycle

  • Definition: The sequence of stages that data goes through from creation to deletion.

  • Stages:

    1. Data Creation

      • Collection of raw facts (numbers, text, images, sounds, etc.).

      • Sources: manual entry, sensors, IoT devices, transactions, surveys.

      • Example: Entering marks into a computer, scanning barcodes.

    2. Data Management

      • Organizing, storing, and maintaining data for effective use.

      • Includes: validation, updating, securing, and backup.

      • Ensures data quality (accuracy, consistency, availability).

    3. Removal of Obsolete Data

      • Discarding outdated, redundant, or irrelevant data.

      • Improves storage efficiency and system performance.

      • Ensures compliance with data protection/privacy laws.


🔹 2. Data vs. Information

  • Data

    • Raw, unprocessed facts and figures.

    • Has no meaning on its own.

    • Examples: 45, Apple, 2025-09-16.

  • Information

    • Processed, organized, or structured data with meaning.

    • Helps decision-making.

    • Example: “The student scored 45 marks in ICT on 16th Sept 2025.”

  • Key Difference

    • Data = raw input

    • Information = meaningful output


🔹 3. Definition of Information

  • Information is processed data presented in a meaningful context that reduces uncertainty and supports decision-making.


🔹 4. Characteristics of Valuable Information

  • Timeliness

    • Information should be available when required.

    • Late information loses value.

    • Example: Weather forecast before travel.

  • Accuracy

    • Free from errors, reliable.

    • Incorrect data leads to wrong decisions.

  • Presented within Context

    • Information must relate to the purpose.

    • Example: Marks shown with subject and student name.

  • Enhanced Understandability

    • Easy to interpret and use.

    • Example: Graphs, tables, charts for clarity.

  • Less Uncertainty

    • Should help in making confident decisions.

    • Example: Sales report reducing doubts about performance.


🔹 5. The Need to Handle Large Volumes & Complexities of Data

  • Modern society generates massive amounts of data (emails, social media, business transactions, IoT sensors).

  • Challenges:

    • Storage management

    • Speed of processing

    • Data security & privacy

    • Extracting useful insights

  • Solution: Big Data technologies and analytics (Hadoop, Spark, AI, Cloud computing).


🔹 6. Data, Process, and Information Relationship

  • Data → Process → Information

    • Data: raw input

    • Process: actions applied (sorting, calculating, analyzing)

    • Information: useful output

  • Example:

    • Data: Marks of students

    • Process: Calculating averages

    • Information: “Class average is 72 marks.”


🔹 7. Various Forms of Data & Their Characteristics

  • Types of Data:

    • Text – words, documents.

    • Numeric – numbers, measurements.

    • Audio – sounds, music, voice.

    • Video – moving images.

    • Image/Graphics – pictures, diagrams.

    • Symbols/Codes – barcodes, QR codes, binary.

  • Characteristics of Quality Data

    • Accuracy

    • Completeness

    • Consistency

    • Relevance

    • Reliability

    • Timeliness


🔹 8. Big Data, Its Need & Analysis

  • Big Data: Extremely large datasets that cannot be handled by traditional databases.

  • Characteristics (5Vs):

    • Volume – huge amounts of data.

    • Velocity – speed of data generation.

    • Variety – different formats (structured, unstructured, semi-structured).

    • Veracity – accuracy and reliability.

    • Value – usefulness of data.

  • Need:

    • To identify patterns, trends, predictions.

    • Used in healthcare, business, government, education.

  • Analysis Tools: Data mining, Machine Learning, AI analytics, Cloud platforms.


Summary (Quick Revision Points)

  • Data life cycle → creation, management, removal.

  • Data = raw facts; Information = processed meaningful data.

  • Valuable info → timely, accurate, contextual, understandable, reduces uncertainty.

  • Data, process, information are interconnected.

  • Data forms → text, numbers, images, audio, video.

  • Quality data → accurate, complete, consistent, relevant.

  • Big Data → huge, complex datasets requiring advanced analysis.






📚 Flashcards – GCE A/L ICT Unit 1 (Basic Concepts of ICT)

Life Cycle of Data

Q: What are the stages of the data life cycle?
A: Data creation, data management, and removal of obsolete data.


Data vs Information

Q: Define information.
A: Information is processed, organized data that is meaningful and useful.

Q: What are the characteristics of valuable information?
A: Timeliness, accuracy, context, understandability, and less uncertainty.


Applicability of Information

Q: How is information applied in daily life?
A: For decision making, policymaking, predictions, planning, scheduling, and monitoring.


Drawbacks of Manual Methods

Q: What are the drawbacks of manual methods in data handling?
A: Inconsistency and duplication, errors, lack of sharing, inefficiency in harmful/risky situations.


Emergence of ICT Era

Q: Why did the ICT era emerge?
A: To overcome drawbacks of manual methods using IT.

Q: Where is ICT information used?
A: Education, healthcare, agriculture, business, engineering, tourism, media, journalism, and law enforcement.


Development of Technologies

Q: What are key ICT technologies?
A: Information retrieval and sharing systems, computer networks, Internet & WWW, mobile computing, cloud computing.


Abstract Model of Information Creation

Q: What is the abstract model of information creation?
A: Input → Process → Output.

Q: How does it apply to ICT?
A: Computers use hardware, software, and human operators to perform these stages.


Hardware, Software, Human Operators

Q: How is hardware classified?
A: Input devices, output devices, processing devices, storage devices.

Q: How is software classified?
A: System software and application software.

Q: Why are human operators important in ICT systems?
A: To manage, supervise, and control ICT operations.


Steps in Data Processing

Q: What are the steps in data processing?
A: Data gathering, data validation, data processing, data output, data storage.


Data Gathering

Q: What are methods of data gathering?
A: Manual, semi-automated, and automated.

Q: What are tools for automated data gathering?
A: OMR, OCR, MICR, card/tape readers, magnetic strip readers, bar code readers, sensors, loggers.


Data Validation

Q: What are data validation methods?
A: Data type check, presence check, range check.


Data Input

Q: What are the modes of data input?
A: Direct vs. remote, online vs. offline.


Data Processing Types

Q: What are the two main data processing types?
A: Batch processing and real-time processing.


Output Methods

Q: What are output methods?
A: Direct presentation to the user, or storing for further processing.


Storage Methods

Q: What are types of storage?
A: Local vs. remote (cloud); short-term vs. long-term storage.


Application of ICT in Various Sectors

Q: List some sectors where ICT is applied.
A: Education, healthcare, agriculture, business & finance, engineering, tourism, media/journalism, law enforcement.


Benefits of ICT

Q: What are benefits of ICT?
A: Social benefits (connectivity, communication), economic benefits (growth, jobs, productivity).


Issues of ICT

Q: What issues arise from ICT?
A: Social, economic, environmental, ethical, legal, privacy, and digital divide.


Security Concerns

Q: What are main ICT security concerns?
A: Confidentiality, stealing/phishing, piracy, copyright/IP laws, plagiarism, licensed vs unlicensed software.



Wednesday, September 10, 2025

Full list of HTML5 elements grouped with meaning and examples BIT ICT GIT Online Classes English Sinhala Tamil Medium

📘 HTML5 Elements List with Explanation & Example


1. Basic Structure Tags

Tag Explanation Example
<!DOCTYPE html> Defines document type as HTML5. <!DOCTYPE html>
<html> Root element of the page. <html lang="en"> ... </html>
<head> Metadata container (title, styles, scripts). <head><title>My Page</title></head>
<title> Sets the page title (shown in browser tab). <title>Home Page</title>
<body> Main visible page content. <body>Hello World</body>

2. Text Content

Tag Explanation Example
<h1> … <h6> Headings (h1 = biggest, h6 = smallest). <h1>Main Title</h1>
<p> Paragraph. <p>This is a paragraph.</p>
<br> Line break. Line1<br>Line2
<hr> Horizontal line. <hr>
<strong> Bold importance. <strong>Important</strong>
<em> Italic emphasis. <em>Note this</em>
<b> Bold (style only). <b>Bold Text</b>
<i> Italics (style only). <i>Italic Text</i>
<mark> Highlighted text. <mark>Highlight</mark>
<small> Smaller text. <small>Fine print</small>
<sup> Superscript. 2<sup>nd</sup>
<sub> Subscript. H<sub>2</sub>O

3. Links & Navigation

Tag Explanation Example
<a> Hyperlink. <a href="page.html">Click Here</a>
<nav> Navigation section. <nav><a href="#">Home</a></nav>

4. Lists

Tag Explanation Example
<ul> Unordered list (bullets). <ul><li>Item 1</li></ul>
<ol> Ordered list (numbers). <ol><li>First</li></ol>
<li> List item. <li>Point</li>
<dl> Description list. <dl><dt>HTML</dt><dd>A markup language</dd></dl>
<dt> Term (name). <dt>CSS</dt>
<dd> Description. <dd>Styling language</dd>

5. Media Elements

Tag Explanation Example
<img> Insert image. <img src="pic.jpg" alt="My Photo">
<audio> Insert audio. <audio controls><source src="song.mp3"></audio>
<video> Insert video. <video controls><source src="movie.mp4"></video>
<source> Media source. <source src="clip.mp4" type="video/mp4">
<track> Subtitles/captions for video. <track src="subs.vtt" kind="subtitles">
<canvas> Drawing graphics with JS. <canvas id="myCanvas"></canvas>
<svg> Scalable vector graphics. <svg><circle cx="50" cy="50" r="40"/></svg>
<figure> Groups media (image/video). <figure><img src="img.png"><figcaption>Caption</figcaption></figure>
<figcaption> Caption for <figure>. <figcaption>Photo of sunset</figcaption>

6. Forms & Input

Tag Explanation Example
<form> Form container. <form action="submit.php"></form>
<input> Input field. <input type="text">
<label> Label for input. <label for="name">Name:</label>
<textarea> Multi-line text input. <textarea></textarea>
<button> Button. <button>Click</button>
<select> Dropdown. <select><option>One</option></select>
<option> Dropdown option. <option value="1">Choice 1</option>
<optgroup> Grouped dropdown options. <optgroup label="Fruits"><option>Apple</option></optgroup>
<fieldset> Group related inputs. <fieldset><legend>Login</legend></fieldset>
<legend> Caption for <fieldset>. <legend>Personal Info</legend>
<datalist> Autocomplete input list. <input list="browsers"><datalist id="browsers"><option>Chrome</option></datalist>
<output> Output result. <output>42</output>
<meter> Gauge (e.g., fuel). <meter value="0.7">70%</meter>
<progress> Progress bar. <progress value="50" max="100"></progress>

7. Table Elements

Tag Explanation Example
<table> Table. <table><tr><td>Data</td></tr></table>
<tr> Table row. <tr><td>A</td></tr>
<td> Table cell. <td>Value</td>
<th> Table header cell. <th>Name</th>
<thead> Header group. <thead><tr><th>Title</th></tr></thead>
<tbody> Body rows. <tbody><tr><td>Content</td></tr></tbody>
<tfoot> Footer rows. <tfoot><tr><td>Total</td></tr></tfoot>
<caption> Table caption. <caption>Student Marks</caption>
<colgroup> Group of columns. <colgroup><col span="2"></colgroup>
<col> Column formatting. <col style="background:yellow">

8. Semantic Elements (HTML5 new features)

Tag Explanation Example
<header> Top section. <header><h1>Logo</h1></header>
<footer> Bottom section. <footer>© 2025 MySite</footer>
<main> Main content. <main><h2>Article</h2></main>
<section> Section of content. <section><h2>About</h2></section>
<article> Independent content. <article><h2>News</h2></article>
<aside> Sidebar. <aside>Related Links</aside>
<address> Contact info. <address>info@email.com</address>
<details> Expandable details. <details><summary>Read More</summary>Extra info</details>
<summary> Title of details. <summary>Click Me</summary>
<time> Represents time/date. <time datetime="2025-09-09">Today</time>

9. Scripting & Metadata

Tag Explanation Example
<script> JavaScript code. <script>alert('Hi');</script>
<noscript> Content shown if JS disabled. <noscript>Please enable JavaScript</noscript>
<style> Internal CSS. <style>body{color:red;}</style>
<link> External resource (CSS). <link rel="stylesheet" href="style.css">
<meta> Metadata. <meta charset="UTF-8">
<base> Base URL for links. <base href="https://example.com/">

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