HTML, CSS and JavaScript build interactive browser applications.
The web platform: HTML structures content, CSS styles it, JavaScript adds behaviour; browsers render via DOM and CSSOM. Concerns: responsive design, accessibility (WCAG), performance (Core Web Vitals), SEO, security. Tools: dev tools, bundlers and frameworks.
A page with a form, style sheet and script is a complete small web app.
Web development builds the interfaces people use in browsers, so HTML, CSS and JavaScript are the basic skills for most software roles.
HTML, CSS and JavaScript build interactive browser applications.
Web development builds the interfaces people use in browsers, so HTML, CSS and JavaScript are the basic skills for most software roles.
HTML gives structure, CSS controls appearance and layout, and JavaScript adds behaviour and interactivity.
Users reach sites on many screen sizes, so layouts must adapt to avoid unreadable or cut-off content.
Typical applications include building a dashboard that shows live sensor values in a browser, creating a form that validates input before sending it to the server and styling a page so it works on phones and desktops.
Study "Secure software development" first (topic 88 of 104 in Software & Computing). It covers the groundwork this topic builds on.
Semantic HTML. Flexbox and Grid. Progressive enhancement.
A page with a form, style sheet and script is a complete small web app.
The next topic is "Front-end frameworks", which builds directly on this one.
It is classed as Advanced in Software & Computing (topic 89 of 104). It is an advanced topic. It assumes you are comfortable with the intermediate topics in Software & Computing.
Want to practise? Open the interactive course for quick checks, quizzes, simulations and progress tracking.