Mastering Web Development: HTML, CSS, JS, and MongoDB
Differences Between XML and HTML
| XML | HTML |
|---|---|
| Extensible Markup Language | HyperText Markup Language |
| Used to store and transport data | Used to display data in a browser |
| User-defined tags | Predefined tags |
| Case-sensitive | Not case-sensitive |
| Strict syntax; errors are not tolerated | Flexible; errors are tolerated |
| Focus: Data | Focus: Presentation |
ID vs Class in HTML
| ID | Class |
|---|---|
| Unique for one element | Can be used for many elements |
| Used for JavaScript targeting | Used mainly for styling groups |
Syntax: #id in CSS | Syntax: .class in CSS |
| Example: |
Interfacing 4×4 Matrix Keypad with 8051 Microcontroller
Keypads: Input Devices for Embedded Projects
Keypads are widely used input devices in various electronics and embedded projects. They are used to take inputs in the form of numbers and alphabets, and feed the same into the system for further processing. In this tutorial, we will interface a 4×4 matrix keypad with the 8051 microcontroller.
Understanding the 4×4 Matrix Keypad
Before interfacing the keypad with the microcontroller, first, we need to understand how it works. A matrix keypad consists of
Read MoreCore Data Structures and Sorting Algorithms with C Examples
(a) List the various operations performed on Data Structures
Traversal → Accessing each data element once. Insertion → Adding an element at a specific position. Deletion → Removing an element from a structure. Searching → Finding the location of an element. Sorting → Arranging elements in ascending or descending order. Merging → Combining two structures into one. Updating → Modifying existing data.
(f) Sort using Insertion Sort
Given: 22, 36, 6, 79, 26, 45, 75
Stepwise Sorting:
[22] 36Read More
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Submit ApplicationHTML Web Page Structure
HTML documents follow a standard structure that web browsers understand:
| Element | Description |
|---|---|
<!DOCTYPE html> | Declares the document type and version of HTML. Required at the top. |
<html |
E-commerce and Database Concepts for Business & IT
Module 3: E-commerce
- E-commerce, or electronic commerce, refers to the act of performing business transactions, such as buying or selling goods, over the Internet.
- Business-to-Consumer (B2C) involves businesses selling products or services directly to individual customers.
- Business-to-Business (B2B) covers transactions between two businesses and represents the largest segment of e-commerce by dollar volume.
- Consumer-to-Consumer (C2C) facilitates transactions between individual people, often through
Database Data Models: Structure, Keys, and ER Design
Data Models: Blueprint for Data Management
Data models serve as the blueprint for how data is structured, stored, and manipulated. The evolution of these models reflects the growing need for flexibility and the ability to handle complex relationships.
Evolution of Data Models
1. Hierarchical Data Model
The Hierarchical Model is the oldest of the three, popularized by IBM’s Information Management System (IMS) in the 1960s. It organizes data in a top-down, tree-like structure.
- Structure: Data is represented