🆚 CSS vs. RSD
CSS is three times more popular than RSD.- CSS is more popular in all countries.
RSD is particularly popular in Spain, Italy, and Australia.
Type
About
Cascading Style Sheets (CSS) is a stylesheet language used to control the presentation of 
HTML and 
XML documents, defining layout, colors, typography, and responsive behavior across different devices.
It uses a cascading and specificity model to resolve style conflicts, supports reusable rules and selectors, and includes layout systems such as Flexbox and Grid, media queries for responsive design, and features for animations, transformations, and advanced text formatting.
Really Simple Discovery (RSD) is an XML format that allows client software to discover services provided by web publishing systems.
It helps clients find endpoints for reading, editing, and interacting with website content through APIs.
Headquarters
Popularity
Determined by the number of sites using each technology.
Market share
Popularity by country
Determined by the number of sites detected from each country.
Awards
- 🥇 Most popular in the United States in the Standards category.
- 🥇 Most popular in Japan in the Standards category.
- 🥇 Most popular in the United Kingdom in the Standards category.
- 🥇 Most popular in France in the Standards category.
- 🥇 Most popular in Russia in the Standards category.
- ⭐ 4th most popular in El Salvador in the Standards category.
- ⭐ 4th most popular in Bhutan in the Standards category.
- ⭐ 5th most popular in Iran in the Standards category.
- ⭐ 5th most popular in Bulgaria in the Standards category.
- ⭐ 5th most popular in Lithuania in the Standards category.
Popularity by domain category
Determined by the number of sites in each category.
Top sites
Top-ranked sites that use these technologies.
Compare alternatives
Technologies with similar characteristics.
🗃️ About This Data
- We evaluate the popularity of technologies based on the number of websites where we detect their usage.
- Technologies without a detectable web footprint, and those we do not track, are not reflected in the calculated market share.
- This report is based on the analysis of 4,046,772 websites.
- Statistics were last calculated on .
- For more details, see our methodology and disclaimer.