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HTML

  <html>
     <head>
        <title><title>
     </head>
       <body>
         <h1>Hello World</h1>
       </body>
   </html>

CSS


  body {
  background-color: lightblue;
  color: black;
  font-family: Arial, sans-serif;
  }
          <style>
      body {
      background-color: yellow;
     }
     </style>

Javascript

  	
   function greetUser(name) {
   document.write("Hello"+name +"!

     ");}
   greetUser("Sahabuddin");
   greetUser("Amit");

PHP

            		
  $name = "Sahabuddin";
  $age = 22;
  echo "Name:", 
  $name," |Age:
  ", $age;
  print "Welcome to PHP!";
  $name = "John";
  $number = 100;
 echo "Hello $name,your 
 number is $number.";
 Hello John, your number is 100.

Here are key aspects of HTML content:

HTML content refers to the information and elements that make up the visible and structural parts of a web page, as defined by HyperText Markup Language (HTML). HTML is a markup language that uses a system of tags to structure and present content within a web browser. Structure and Elements: HTML content is organized using various elements, each with a specific purpose. These elements are represented by tags, such as for headings, for paragraphs, for links, for images, and for general-purpose containers.
Visible Content: The majority of HTML content resides within the tags of an HTML document. This includes all the text, images, videos, forms, tables, and other interactive elements that users see and interact with on a webpage.
Metadata: HTML also includes metadata, which is information about the webpage itself, not directly displayed on the page. This metadata is typically found within the tags and includes elements like for character sets, descriptions, keywords, and viewport settings, and for the page's title displayed in the browser tab.Semantic HTML: Modern HTML emphasizes semantic elements, which provide inherent meaning to the content they enclose. Examples include These semantic tags help improve accessibility, search engine optimization, and the overall understanding of the document's structure. Attributes: HTML elements can have attributes, which provide additional information or modify the behavior of the element. For instance, the src attribute of an img-tag tag specifies the image source, and the href attribute of an tag specifies the link destination. Interactivity: HTML content can be made interactive through elements like forms form-tag, ), and by integrating scripting languages like JavaScript, which can manipulate HTML elements and respond to user actions.

Key aspects of CSS include::

CSS, or Cascading Style Sheets, is a stylesheet language used to describe the presentation of web pages written in HTML or XML. It is a fundamental technology alongside HTML and JavaScript for building web content,Separation of Concerns: CSS allows for the separation of content (HTML) from its visual presentation. This means you can change the look and feel of a website without altering its underlying structure, making maintenance and updates more efficient. Styling Capabilities: CSS controls various aspects of visual presentation, including colors, fonts, spacing, layout, positioning of elements, backgrounds, borders, and more. Cascading Nature: The "cascading" in CSS refers to the way styles are applied when multiple rules target the same element. A set of rules (importance, specificity, and source order) determines which style takes precedence. Selectors: CSS uses selectors to target specific HTML elements or groups of elements to apply styles. Selectors can target elements by tag name, class, ID, attributes, state, or position. Types of CSS: Inline CSS: Styles applied directly to an HTML element using the style attribute. Internal CSS: Styles defined within the style tags in the section of an HTML document. External CSS: Styles defined in a separate .css file and linked to the HTML document. This is the most common and recommended method for larger projects. Responsive Design: CSS enables the creation of responsive web designs that adapt to different screen sizes and devices, providing an optimal viewing experience across desktops, tablets, and mobile phones. Enhanced User Experience: CSS facilitates the implementation of visual enhancements like transitions, animations, and interactive elements, contributing to a more engaging user experience.