# Web Development glossary: Master level

14 Web Development terms at the Master level, each with a short definition and a link to its full page.

Updated: September 27, 2026

[Study these as flash cards](https://www.ask-codey.com/decks/web-development/master)

- [Compositing](https://www.ask-codey.com/glossary/compositing): Combining painted layers into the final picture.
- [Critical CSS](https://www.ask-codey.com/glossary/critical-css): The styles needed for the first screen, inlined so it shows fast.
- [CSS Object Model](https://www.ask-codey.com/glossary/css-object-model): The browser's in-memory model of the page's CSS, readable from JavaScript.
- [HTML parser](https://www.ask-codey.com/glossary/html-parser): The browser component that turns HTML source into a document tree.
- [HTTP/2 and HTTP/3](https://www.ask-codey.com/glossary/http-2-and-http-3): Newer HTTP versions that send many requests at once over one connection.
- [Layout](https://www.ask-codey.com/glossary/layout): The step where the browser works out every box's size and position.
- [MathML namespace](https://www.ask-codey.com/glossary/mathml-namespace): The namespace URI that identifies inline MathML elements in a document tree.
- [Mutual TLS](https://www.ask-codey.com/glossary/mutual-tls): Both client and server present certificates to prove who they are.
- [Reflow](https://www.ask-codey.com/glossary/reflow): The browser redoing layout after a size or position change.
- [Repaint](https://www.ask-codey.com/glossary/repaint): Redrawing pixels after a look changes, without a size change.
- [Server-Sent Events](https://www.ask-codey.com/glossary/server-sent-events): A response kept open so the server can push a stream of events.
- [Style invalidation](https://www.ask-codey.com/glossary/style-invalidation): Working out which elements need styles recalculated after a change.
- [SVG namespace](https://www.ask-codey.com/glossary/svg-namespace): The namespace URI that identifies inline SVG elements in a document tree.
- [text/html MIME type](https://www.ask-codey.com/glossary/text-html-mime-type): The media type that identifies a resource as an HTML document parsed with HTML syntax.

- Previous level: [Freelancer](https://www.ask-codey.com/glossary/subjects/web-development/freelancer)

[Every Web Development term, by level](https://www.ask-codey.com/glossary/subjects/web-development)

Source: https://www.ask-codey.com/glossary/subjects/web-development/master