CSS | IGCSE Information and Communication Technology Preparation - Year 11 PDF Download

How to use CSS

  • The presentation layer of a web page is determined by CSS (Cascading Style Sheets), focusing on layout, colors, fonts, and animations.
  • It delineates the content (HTML) from the visual presentation of the web page.
  • CSS provides enhanced control and adaptability in crafting the design of a web page.

Inline Styles

External CSS is composed in a distinct file with a .css extension and linked to the HTML document. This approach enables the utilization of the same styles across multiple pages. For instance:
<head>
  <link rel="stylesheet" href="styles.css">
</head>
Inline CSS is written directly within the HTML tags using the style attribute. This applies the style only to that specific element. E.g.
<p style="color:blue;">This is a blue paragraph.</p>

Background Properties

  • Background Colour: Set the background colour using the background-color property. e.g. background-color: blue;
  • Background Images: Set a background image using the background-image property. e.g. background-image: url("image.jpg");

Font Properties

Control the appearance of text with font properties. This includes font-size, font-family, color, text-align, and more. E.g.
p {
  font-size: 14px;
  font-family: Arial;
  color: blue;
  text-align: center;
}

Tables

CSS is used to style HTML tables, allowing us to define the appearance of the table, table rows, table headers, and table data cells.

  • Size: Control the width and height of a table using width and height. e.g. width: 100%; height: 200px;
  • Background Colour: Use background-color to set the background. e.g. background-color: yellow;
  • Borders: Apply a border using the border property. This includes colour, thickness, and visibility. For instance: border: 2px solid black;
  • Collapsed Borders: Use border-collapse: collapse; to make borders appear as a single line
  • Spacing: Control the space between cells with border-spacing. e.g. border-spacing: 5px;
  • Padding: Define the space between cell content and its border with padding. e.g. padding: 10px;

table {
  width: 100%;
  height: 200px;
  background-color: yellow;
  border: 2px solid black;
  border-collapse: collapse;
  border-spacing: 5px;
}

  • Size: Control the width and height of rows, headers, and data cells just like with tables. e.g. width: 50px; height: 50px;
  • Background Colour: Use background-color to set the background of rows, headers, and data cells
  • Horizontal and Vertical Alignment: Control alignment with text-align (horizontal) and vertical-align (vertical). e.g. text-align: center; vertical-align: middle;
  • Padding: Define the space between cell content and its border with padding
  • Borders: Apply a border using the border property

th, td {
  width: 50px;
  height: 50px;
  background-color: white;
  text-align: center;
  vertical-align: middle;
  padding: 10px;
  border: 1px solid black;
}

Question for CSS
Try yourself:
Which CSS property is used to set the background color of an element?
View Solution

Classes

  • CSS classes are employed to style multiple HTML elements concurrently.
  • To define a class, employ a period (.) followed by the class name. To apply a class to an HTML element, utilize the class attribute.
  • Background Colour: Use the background-color property. E.g.
    .red-background {
      background-color: red;
    }
  • Background Images: Use the background-image property. E.g.
    .image-background {
      background-image: url("image.jpg");
    }
  • Font Properties: Control the font size, family, colour, and alignment. E.g.
    .big-blue-text {
      font-size: 20px;
      font-family: Arial;
      color: blue;
      text-align: center;
    }
  • Size: Control the width and height with width and height. E.g.
    .small-cell {
      width: 30px;
      height: 30px;
    }
  • Background Colour: Use background-color to set the background. E.g.
    .yellow-cell {
      background-color: yellow;
    }
  • Horizontal and Vertical Alignment: Use text-align (horizontal) and vertical-align (vertical). E.g.
    .center-align {
      text-align: center;
      vertical-align: middle;
    }
  • Spacing, Padding, Borders: Use padding for space inside the cell, and border for cell borders. E.g.
    .padded-cell {
      padding: 10px;
      border: 2px solid black;
    }
  • Collapsed Borders: Use border-collapse: collapse; the table class to remove spaces between cell borders. E.g.
    .collapsed-table {
      border-collapse: collapse;
    }
    Apply these classes to HTML elements like this:
    <table class="collapsed-table">
      <tr class="small-cell yellow-cell center-align">
        <td class="padded-cell">Content</td>
      </tr>
    </table>

External CSS

  • External Styles refer to CSS styles that are delineated in a distinct .css file and linked to the HTML document. This enables the reuse of identical styles across various web pages.
  • To establish external styles for HTML elements such as h1, h2, h3, p, and li, just designate the element and delineate the styles within curly braces {}. For instance:
    h1 {  font-family: Arial;
      font-size: 30px;
      color: blue;
      text-align: center;
    }
    h2 {
      font-family: Arial;
      font-size: 25px;
      color: red;
      text-align: left;
    }
    h3 {
      font-family: Arial;
      font-size: 20px;
      color: green;
      text-align: right;
    }
    p, li {
      font-family: Arial;
      font-size: 14px;
      color: black;
      text-align: justify;
    }
  • The CSS provided assigns distinct font families, sizes, colors, and alignments to h1, h2, h3, p, and li tags. Additionally, the p and li elements share the same style.
  • To implement bold or italic styles, utilize the font-weight and font-style properties respectively:
    h1 {
      font-weight: bold; /* makes text bold */
    }
    p {
      font-style: italic; /* makes text italic */
    }
  • Comments in CSS serve to elucidate the code and enhance readability. They can be inserted at any point within the code and have no impact on the outcome.
  • A CSS comment is initiated with /* and terminated with */. See above for examples.

Attached Stylesheets vs Inline Style Attributes

  • Attached Stylesheets, represented by external .css files linked to an HTML document, facilitate the reuse of identical styles across multiple web pages. Integration of an attached stylesheet is accomplished using the <link> tag within the <head> tag.
    <head>
      <link rel="stylesheet" href="styles.css">
    </head>
  • Inline Style Attributes entail CSS rules that are directly applied to an HTML element through the style attribute. They exclusively impact the particular element to which they are applied:
    <p style="color:blue;">This is a blue paragraph.</p>
  • The primary distinction lies in the fact that attached stylesheets facilitate reusability and enhance organization, whereas inline styles are employed for individual, specific modifications.

Hierarchy of Multiple Attached Stylesheets and Inline Styles

  • When multiple styles are defined for the same HTML element, the style closest to the element takes precedence. This phenomenon is referred to as the Cascading order.
  • The cascading order, ranked from highest to lowest priority, is as follows:
    • Inline styles (within the HTML element)
    • External and internal styles (within the head section)
    • Browser defaults

Characteristics of a Style and a Class

  • A Style encompasses a collection of CSS properties that determine the visual presentation of an HTML element.
  • A Class serves as a means of selecting multiple elements to impart the same style.
  • The disparity between them lies in their usage: a style defines the CSS properties, whereas a class is employed to apply these properties to numerous elements.

Relative File Paths for Attached Stylesheets

  • Relative file paths are employed for linked stylesheets since they denote the location of the CSS file relative to the current HTML file. This enhances code portability and simplifies management.
  • For instance, if the CSS file resides in the same folder as the HTML file, the path would be "styles.css". If the CSS file is situated in a subfolder named "css", the path would be "css/styles.css".
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FAQs on CSS - IGCSE Information and Communication Technology Preparation - Year 11

1. What are the three ways to use CSS?
Ans. The three ways to use CSS are inline styles, classes, and external CSS.
2. What is the difference between inline styles and classes in CSS?
Ans. Inline styles are applied directly to an HTML element using the style attribute, while classes are reusable styles that can be applied to multiple elements by assigning the class attribute.
3. How is external CSS different from inline styles and classes?
Ans. External CSS is a separate file containing all the styles for a website, which can be linked to multiple HTML pages. This allows for easier maintenance and consistency across the website.
4. Why is using classes in CSS considered a best practice?
Ans. Using classes in CSS allows for better organization, reusability, and consistency in styling across a website. It also helps in separating content from design, making it easier to update styles in the future.
5. What is the syntax for linking an external CSS file to an HTML document?
Ans. The syntax for linking an external CSS file to an HTML document is <link rel="stylesheet" type="text/css" href="styles.css"> placed within the <head> section of the HTML document.
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