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Wikimedia.org is built with the following tech stack:
Document Encoding
UTF-8
UTF-8 (8-bit UCS/Unicode Transformation Format) is a variable-length character encoding for Unicode. It is the preferred encoding for web pages.
Document Standards
Meta Description
The description attribute provides a concise explanation of the page content.
Meta Robot
This page contains a meta robots tag which tells search engines and robots to index or not index the page.
Srcset
Adapting images for high-resolution and low-resolution displays.
HTML5 DocType
The DOCTYPE is a required preamble for HTML5 websites.
HTML 5 Specific Tags
This page contains tags that are specific to an HTML 5 implementation.
Content Type Options
Used to disable MIME-sniffing for a particular HTTP response.
Strict Transport Security
The HTTP Strict-Transport-Security (HSTS) header instructs the browser to only use https.
Mobile
Apple Mobile Web Clips Icon
This page contains an icon for iPhone, iPad and iTouch devices.
SSL Certificates
HSTS
Forces browsers to only communicate with the site using HTTPS.