What is a .CSS file?
CSS is the stylesheet language that controls the look of web pages.
- Did you know
- CSS was proposed by Hakon Wium Lie in 1994 and first standardised in 1996.
- The name stands for Cascading Style Sheets, with the “cascade” describing how rules from different sources combine and resolve conflicts by specificity and source order.
- Disagreements over CSS specificity and verbose syntax drove the rise of preprocessors such as Sass and Less, which added variables, nesting and mixins long before browsers offered them natively.
- CSS is maintained by the World Wide Web Consortium, which now develops it as a set of independent modules rather than one monolithic version.
- On the web a .CSS file is served with the MIME type
text/css.
- What Analyser shows you
- Preview and inspect HTML, CSS, JavaScript, TypeScript, JSON, YAML, XML, and Markdown source files.
- Open a .CSS file
- Drag a .CSS file onto the Analyser home page (or tap to pick one). It opens entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.