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JavaScript is a lightweight, object-oriented, cross-platform scripting language, often used within web pages.

Nginx (pronounced as "engine X") is a lightweight open source web server developed by Igor Sysoev.

SpaceWeb is a Russian web hosting provider owned by RBC Group.

SpaceWeb is a Russian web hosting provider owned by RBC Group.

SpaceWeb is a Russian internet services provider owned by RBC Group.

Yandex is a Russian provider of internet-based services.

Let’s Encrypt is a free, automated, and open certificate authority provided by the Internet Security Research Group.

Yandex.Metrica is a free web analytics system combining customizable reporting tools with behavioral analytics.

External Cascading Style Sheets define style rules in a separate CSS file.

Embedded Cascading Style Sheets define a set of style rules in a <style> element within a web page.

Inline Cascading Style Sheets define style rules directly within an (X)HTML element using the style attribute.

Gzip (GNU zip) is a file compression algorithm.

A strong ETag is an HTTP header field for validation of cached web pages, that indicates a byte-for-byte identical page in the cache.

A weak ETag is an HTTP header field for validation of cached web pages, that indicates a semantically equivalent page in the cache.

HTTP/2 is the second major version of the HTTP network protocol.

HTTP Strict Transport Security (HSTS) defines a mechanism enabling web sites to declare themselves accessible only via secure connections.

The websites redirects visitors to use SSL encryption, e.g. from http://example.com/ to https://example.com/.

HTML5 is the fifth revision of the HTML standard.

Windows-1251 is an 8-bit character encoding, designed to cover languages that use the Cyrillic alphabet.

JPEG (Joint Photographic Experts Group) is a lossy compression method suitable to store photographic images.

WebP is an image format that provides lossless and lossy compression, developed by Google.

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