Libreoffice.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.
Twitter Cards
Twitter cards make it possible for you to attach media experiences to Tweets that link to your content.
Cascading Style Sheets
Cascading Style Sheets (CSS) is a stylesheet language used to describe the presentation of a document written in a markup language. Its most common application is to style web pages written in HTML
Javascript
JavaScript is a scripting language most often used for client-side web development.
Referrer Policy
Requests made from a document, and for navigations away from that document are associated with a Referrer header. This policy determines in the browser should send a referrer or not.
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 Security Policy
Content Security Policy is a computer security concept, to prevent cross-site scripting XSS attacks.
Content Type Options
Used to disable MIME-sniffing for a particular HTTP response.
Mobile
Viewport Meta
This page uses the viewport meta tag which means the content may be optimized for mobile content.