⚡ Standards in Bulgaria

Web standards are a set of guidelines and specifications that define and describe various aspects of the World Wide Web.

Bulgaria is a Southeastern European country with a population of around 6.5 million people.

According to our statistics, standards are used on 94.9% of websites from Bulgaria.

⭐ Most Popular in 2026

The following chart shows the top standards on websites in Bulgaria in 2026, based on market share.

The most popular is CSS with an impressive share of 95.6%, followed by HTML with 91.3% and Open Graph with 50.1%.

CSS 95.6%
HTML 91.3%
Open Graph 50.1%
RSD 28.8%
DNS Prefetch 26%
SearchAction 25.4%
JSON 24.1%
XFN 20.5%
Preconnect 19.1%
Preload 16.8%
Pingback 16.1%
Acceptable Ads 14.2%
Speculation Rules 10.6%
XHTML 7.9%
OAuth 1.9%

🚀 Highlights

Here is a list of the top standards that are more popular in Bulgaria than worldwide.
Differences between global and country rankings are shown in parentheses.

4. RSD ^(-1)
5. DNS Prefetch ^(-1)
6. SearchAction ^(-1)
8. XFN ^(-2)
11. Pingback ^(-1)
12. Acceptable Ads ^(-3)
15. OAuth ^(-1)
16. OpenSearch ^(-3)
17. OpenID ^(-7)
19. CGI ^(-4)

✨ Top Web Standards

Below is a more detailed list of the top 25 of the 44 standards used on sites from Bulgaria, ranked by their market share.

Rank	Name	Market share
1	CSS Cambridge, Massachusetts, United States A stylesheet language used to control the presentation of HTML and XML documents, defining layout, colors, typography, and responsive behavior across different devices.	95.6%
2	HTML Cambridge, Massachusetts, United States A markup language used to create web pages and is the de facto standard for documents displayed in web browsers.	91.3%
3	Open Graph Menlo Park, California, United States Enables any web page to become a rich object in a social graph.	50.1%
4	RSD An XML format that helps client software find the services needed to read, edit, or "work with" weblogging software.	28.8%
5	DNS Prefetch Cambridge, Massachusetts, United States The rel="dns-prefetch" attribute on HTML elements.	26%
6	SearchAction Cambridge, Massachusetts, United States A structured data type from Schema.org that describes a website's search capability.	25.4%
7	JSON A lightweight, language-independent data exchange format derived from JavaScript and used to structure and transmit data between systems.	24.1%
8	XFN An HTML microformat that provides a simple way to represent human relationships using links.	20.5%
9	Preconnect Cambridge, Massachusetts, United States The rel="preconnect" attribute on HTML elements.	19.1%
10	Preload Cambridge, Massachusetts, United States The rel="preload" attribute on HTML elements.	16.8%
11	Pingback A method for web authors to request notification when somebody links to one of their documents.	16.1%
12	Acceptable Ads Berlin, Germany A set of criteria defined by the independent Acceptable Ads Committee that allows publishers to reach ad-blocking users with respectful, non-intrusive and relevant ads.	14.2%
13	Speculation Rules Mountain View, California, United States API is used to improve navigation performance by prefetching or even prerendering future navigations.	10.6%
14	XHTML Cambridge, Massachusetts, United States An XML-based markup language that extends HTML 4.	7.9%
15	OAuth Fremont, California, United States An open standard authorization protocol that allows applications to obtain limited access to user accounts without sharing passwords across web, mobile, and desktop environments.	1.9%
16	OpenSearch Seattle, Washington, United States A specification that describes a website's search engine, enabling browsers, apps, and services to discover and integrate it.	1.2%
17	OpenID San Ramon, California, United States A decentralized authentication protocol based on OAuth 2.0 that enables applications to verify a user's identity through an external identity provider instead of managing credentials directly.	1.2%
18	Prefetch Cambridge, Massachusetts, United States The rel="prefetch" attribute on HTML elements.	1.1%
19	CGI Wilmington, Delaware, United States An interface specification that enables web servers to execute an external program to process HTTP requests.	1%
20	YAML A data serialization language designed to be human friendly and work well with modern programming languages for common everyday tasks.	0.9%
21	IAB TCF Brussels, Belgium An open-source industry standard developed by IAB Europe that helps companies comply with GDPR and ePrivacy requirements when processing personal data in digital advertising ecosystems.	0.8%
22	Trace Context Cambridge, Massachusetts, United States Defines standard HTTP headers and a value format for propagating context information that enables distributed tracing.	0.6%
23	OpenAPI San Francisco, California, United States A specification language for defining HTTP APIs, typically written in YAML or JSON.	0.4%
24	Less A backward-compatible CSS language extension inspired by Sass that supports variables, mixins, operations, and functions.	0.4%
25	RelMeAuth A proposed open standard for using rel-me links to profiles on OAuth supporting services to authenticate via either those profiles or your own site.	0.4%

👉 See Also

🌎 Standards in other countries

Data is based on the analysis of 12,911 websites from Bulgaria.
Statistics were last calculated on March 21, 2026.
For details, see our methodology and disclaimer.