🆚 CSS vs. Speculation Rules
- 📈 CSS is much more popular than Speculation Rules.
- 🌍 CSS is more popular in all countries.
CSS
Speculation RulesType
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.
The Speculation Rules API is a browser API that improves navigation performance by prefetching or prerendering pages that users are likely to visit next.
It uses 
JSON-based rules embedded in HTML or HTTP headers, and is designed as a successor to older techniques such as Prefetch and the deprecated Prerender attribute.
Headquarters
Categories
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.
- 🥉 Third most popular in Albania in the Performance Optimization category.
- 🥉 Third most popular in Uganda in the Performance Optimization category.
- 🥉 Third most popular in Trinidad and Tobago in the Performance Optimization category.
- 🥉 Third most popular in Rwanda in the Performance Optimization category.
- 🥉 Third most popular in Jersey in the Performance Optimization 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.
YAML
Sass
Instant.Page🗃️ 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 3,532,692 websites.
- Statistics were last calculated on .
- For more details, see our methodology and disclaimer.