Web Development Layers
Overview
Every web page you visit is built from three separate layers that do three different jobs: one holds the content, one decides how it looks, and one makes it react. Pulling these apart is one of the most important ideas in modern web development, because it lets a designer restyle a whole site without touching a word of its text, and lets a writer change the text without breaking the design.
In this lesson you will learn the purpose of each layer: the content layer written in HTML, the presentation layer written in CSS, and the behaviour layer written in a scripting language such as JavaScript. You will see why keeping them in separate files matters and how the three fit together to make a single page. This is the foundation that the rest of website authoring is built on.
Objectives
- The three web development layers.
- Content layer is used to enter the content and create the structure of a web page Presentation layer is used to display and format elements within a web page Behaviour layer is for a scripting language to control elements within a web page.
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Lesson Evaluation
Congratulations on completing the lesson on Web Development Layers. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- Which language is used to create the content layer of a web page? A. CSS B. JavaScript C. HTML D. SQL Answer: C
- The presentation layer of a web page is responsible for: A. The text and images B. The colours, fonts and layout C. Reacting to button clicks D. Storing data Answer: B
- Which layer makes a web page interactive, for example validating a form? A. Content layer B. Presentation layer C. Behaviour layer D. Storage layer Answer: C
- CSS is an abbreviation for: A. Computer Style System B. Cascading Style Sheets C. Central Styling Service D. Coded Style Syntax Answer: B
- A main benefit of keeping styles in a separate CSS file is that: A. The page loads no images B. One change restyles many pages at once C. HTML becomes a programming language D. JavaScript is not needed Answer: B
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