An integrated development environment brings tools such as editing, project navigation, running and debugging into one application. A code editor can gain many of those capabilities through extensions. The boundary is practical rather than a guarantee that every IDE contains every compiler.
Try the same task in each tool
Open a small HTML document and stylesheet. Find a selector, rename it consistently, inspect a syntax error, and run or preview the page. Check how the tool helps you locate the files and understand the result. Browser developer tools remain useful even with a capable editor.
Compare actual features
Visual Studio Code is an extensible editor with debugging and project tooling. WebStorm is an IDE focused on JavaScript and TypeScript projects. Read each tool’s current platform and licensing details before choosing it; this page does not promise a particular price.
You do not need a large IDE to learn HTML and CSS. A plain-text editor and browser can run the standalone examples on this site. Features such as autocomplete help, but cannot replace understanding content models, layout or keyboard behavior.
Keep the setup small
Add tooling when it solves a recurring problem. Avoid several extensions performing the same formatting task. If using Tailwind, follow the editor setup lesson for version-aware detection. Keep generated files and private settings out of unrelated source changes.
Sources
Reference 1 Reference 2 provide the technical details and current compatibility information.