Id Attribute

Duration: 5 min

This video lesson is available to enrolled students.

Return to /learn/UPPSC-POLYTECHNIC-LECTURER-2025-CS/paper-2-web-technologies/html-basics/html-attributes/asset-id-attribute after enrolling

Inside: a video lesson and guided study material.

Module outline

  1. About Course: UPPSC Course Overview
  2. Interview Preparation & Guidance: Interview Preparation
  3. Paper 1 | General Hindi: भाषा, लिपि, ध्वनि, वर्ण, अक्षर, स्वर, व्यंजन, मात्रा और संयुक्ताक्षर, वर्तनी, वर्ण-विन्यास, अनुस्वार, अनुनासिक, चंद्रबिंदु और ‘र’ के रूप, शब्द, पद और शब्द-भेद, संज्ञा और सर्वनाम, विशेषण और क्रिया, लिंग, वचन, पुरुष और कारक, काल, वाच्य, वाक्य और वाक्य-भेद, वर्णमाला, समास, संधि, विलोम शब्द, पर्यायवाची शब्द, सामान्य अशुद्धियाँ, अनेक शब्दों के लिए एक शब्द, मुहावरे और लोकोक्तियाँ, अपठित गद्यांश और अपठित पद्यांश, Multi-Topic Content (Cross-Concept Material)
  4. Paper 2 | General Studies: State Wise GK, Polity, Geography, History, GK- Current Affairs
  5. Paper 1 | Programming Language: Language Design, C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling, OOPS with C++
  6. Paper 1 | Database Management Systems: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, SQL, Relational Calculus, Transaction Management, Concurrency Control, ORDBMS, NoSQL
  7. Paper 1 | Cyber Security: Society, Law & Ethics, Cyber Threats and Malware Attacks, Role of Internet and Web Services, Security in Mobile and Wireless Computing, Electronic Data Interchange and E-Commerce, Physical Security and Cryptography Basics, Intrusion Detection Systems (IDS), Cyber Safety and Security, Ethical Hacking
  8. Paper 1 | Computer Organization and Architecture: Basics of COA, Programming the Basic Computer, Cache Memory Organization, Input Output Organisation, Instr Formats & Modes, Register Transfer and Microoperations, Control Unit Design
  9. Paper 1 | Computer Networks: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware basics, Network Security
  10. Paper 1 | Design and Analysis of Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos, Advanced Algorithms
  11. Paper 1 | Data Structures: Introduction to DS, Array, Linked List, Stack, Queue, Tree, Graphs, Hashing
  12. Paper 1 | Discrete Structures and Theory of Logic: Permutation and Combination, Set Theory, Relations, Functions, Propositional and Predicate Logic, Graph Theory, Group Theory
  13. Paper 1 | Software Project Management: Software Project Management
  14. Paper 2 | Operating Systems: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, Disc Scheduling, File Management, Unix OS, Linux OS, Security
  15. Paper 2 | Compiler Design: Intro to Compilers, Lexical Analysis, Grammar & CFG, Syntax Analysis: Top-Down, Syntax Analysis: Bottom-Up, Semantic Analysis & SDT, Intermediate Code Gen, Code Optimization, Run Time Environment, Introduction to TOC, Deterministic FA (DFA), Non-Deterministic FA, Regular Expressions, Pushdown Automata & CFG, Complexity Theory
  16. Paper 2 | Artificial Intelligence & High Performance Computing: Approaches to AI, Search Algorithms, Game Playing, Knowledge Representation, Planning, Multi Agent Systems, Natural Language Processing, Emerging Tech Trends
  17. Paper 2 | Image Processing: Digital Image Fundamentals, Image Enhancement, Image Restoration, Color Image Processing, Image Compression
  18. Paper 2 | Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  19. Paper 2 | Computer Graphics: Basics of Computer Graphics, 2-D Geometrical Transforms and Viewing, 3-D Object Representation, Geometric Transformations and Viewing
  20. Paper 2 | Web Technologies: Website, Browser & Services, Internet Fundamentals, Web Design & Development, Protocols & Services, Web Publishing & Hosting, Server Side & Security, Emerging Technologies, HTML Basics, JavaScript-Basics, Java
  21. Paper 2 | Soft Computing: Fuzzy Sets, Artificial Neural Networks, Genetic Algorithms
  22. Paper 2 | Distributed System: Distributed Systems
  23. UPPSC Live Class Recordings: UPPSC Polytechnic Lecturer 2025 (CS)
  24. Previous Year Papers:
  25. Mock Test:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This lecture introduces the HTML id attribute as a unique identifier for an element on a webpage. The instructor defines its purpose, lists four main uses (identifying elements, applying unique CSS styles, accessing via JavaScript, and creating bookmarks), and emphasizes that an id must be used only once per page. The syntax <tag id="uniqueName">Content</tag> is shown with the example <h1 id='mainHeading'>Welcome to HTML</h1>. The lesson then covers three features of the ID attribute (must be unique, can be used on any HTML element, one element = one unique ID) with a CSS example #title{ color:red; } paired with <h1 id="title">HTML</h1>. Finally, a comparison table contrasts ID vs Class across purpose, repeatability, number of elements, CSS selector symbol, JavaScript method (getElementById()), uniqueness, and typical use.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor defines the id attribute as giving a unique name (identifier) to an HTML element and lists its uses: identifying a specific element, applying unique CSS styles, accessing an element through JavaScript, and creating bookmarks. On-screen text shows the syntax <tag id="uniqueName">Content</tag> and the example <h1 id='mainHeading'>Welcome to HTML</h1>. The instructor handwrites 'unique' in red, draws an arrow to 'id', and adds a note that it is used only once; red underlines emphasize 'unique name' and 'only one element', while red checkmarks mark off the uses as they are discussed.

  2. 2:00 – 5:00 02:00-05:00

    The lesson moves to the features of the ID attribute, displayed as three bullets: 'Must Be Unique', 'Can Be Used on Any HTML Element', and 'One Element = One Unique ID'. A code example pairs the CSS selector #title{ color:red; } with <h1 id="title">HTML</h1>, annotated with checkmarks to verify each feature. The instructor then presents an 'ID vs Class' comparison table, progressively adding red checkmarks to rows for Purpose ('Identifies a unique element' vs 'Groups multiple elements'), Can be Repeated?, Number of Elements, CSS Selector Symbol, JavaScript Method (getElementById()), Uniqueness, and Used For.

  3. 5:00 – 5:05 05:00-05:05

    The final sampled window shows the completed ID vs Class comparison table with checkmarks on all discussed rows, including JavaScript Method and Used For. This closing view reinforces the distinction that an ID targets a single unique element while a class groups multiple elements, serving as a revision reference for the lesson's key contrasts.

The lecture builds from definition to application. First, the id attribute is defined as a unique identifier with four practical uses and strict one-per-element usage. Second, its features are formalized (uniqueness, applicability to any element, one-to-one mapping) and demonstrated with a CSS id selector example. Third, an ID vs Class table consolidates the differences across purpose, repeatability, element count, selector syntax (# for ID vs . for class), JavaScript access (getElementById()), and typical use. For exam revision, remember: id = unique, one element, # selector; class = repeatable, multiple elements, . selector.

Loading lesson…