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CSS Introduction

  • CSS stands for Cascading Style Sheets.
  • It's a language used for describing the presentation of web pages.
  • It defines styles and layouts, such as fonts, colors, margins, padding, borders, and positioning.
  • CSS enables developers to create responsive designs that adjust to different screen sizes and devices.
  • CSS is a fundamental tool for web development and plays a crucial role in creating visually appealing, responsive, and accessible web pages.

Here's an basic example of CSS:​

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Why Use CSS?​

There are several reasons why CSS is used in web development. Here are some of the key reasons:

Separation of content and presentation​

CSS allows web developers to separate the presentation of a webpage from its content. This separation makes it easier to manage and maintain the site, as changes to the styles can be made without affecting the content.

Consistency and reusability​

With CSS, developers can create a consistent look and feel across an entire website, making it easier for users to navigate and understand the site. CSS also allows developers to reuse styles across multiple pages, reducing the amount of code needed and making the site faster and more efficient.

Flexibility and control​

CSS offers a wide range of selectors and properties, giving developers more control over their web pages. This flexibility allows developers to create complex layouts and designs that can adapt to different screen sizes and devices.

Faster load times​

By separating the presentation from the content, CSS reduce the amount of code that needs to be loaded, making web pages load faster and improving the user experience.

Accessibility​

CSS can be used to create accessible web pages that are easier to read and navigate for users with disabilities.

How CSS Solved Problem?​

Before CSS, web developers had to use HTML tags to define the presentation of a webpage. For example, if they wanted to change the color of the text, they would have to use the HTML tag <font> with the "color" attribute.

As an example:

<p><font color="red">This is red text</font></p>

The problem with this approach was that it made the HTML code long, complex, and difficult to manage.

CSS solved this problem by allowing developers to define the presentation of a webpage in a separate file. For example, instead of using the <font> tag, the developer could define the color of the text in the CSS file.

As an example:

p {
     color: red;
}

In this example:

  • This CSS rule applies to all <p> elements on the page, making it much easier to manage the styles.
  • If the developer wanted to change the color of all the text on the page, they could simply update this one CSS rule.