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JavaScript is a lightweight, object-oriented, cross-platform scripting language.

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

Nuxt.js is an open source JavaScript framework based on Vue and Node.js.

Zepto is a minimalist JavaScript library with a largely jQuery-compatible API.

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

Node.js is a server-side JavaScript environment for writing network programs such as web servers, originally developed by Ryan Dahl.

Tengine is an open source web server based on Nginx and originated by Taobao.

Alibaba a Chinese e-commerce and cloud computing company.

China Telecom (China Telecommunications Corporation) is a Chinese state-owned telecommunication company.

UCloud is a Chinese cloud computing provider.

Zenlayer is a cloud services provider headquartered in USA.

Tencent is a Chinese IT and telecommunication company. This includes its QQ brand and others.

Cogent Communications is a multinational internet service provider based in the USA.

CenturyLink is a multinational communications company headquartered in USA, owned by Lumen. This includes its subsidiaries CenturyTel, Savvis, Qwest, Embarq and the former brand Level 3.

Alibaba a Chinese e-commerce and cloud computing company.

China Telecom (China Telecommunications Corporation) is a Chinese state-owned telecommunication company.

Zenlayer is a cloud services provider headquartered in USA.

Tencent is a Chinese IT and telecommunication company. This includes its QQ brand and others.

Tencent is a Chinese IT and telecommunication services provider. This includes its QQ and DNSPod brands.

Microsoft is a multinational technology company headquartered in USA, also offering email services.

DigiCert is an SSL certificate authority. This includes Verizon, whose Enterprise SSL Business has been acquired by DigiCert.

Baidu Analytics (Tongji) is a web analytics service by Baidu.

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.

Brotli is a lossless compression algorithm developed by Google.

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.

The Internet Protocol version 6 (IPv6) provides amongst others a vastly larger address space than the preceding version 4. We consider a website to support IPv6 if a 128-bit address is assigned to it, regardless of the content delivered at that address.

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

The websites redirects visitors to its www subdomain, e.g. from example.com to www.example.com.

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.

UTF-8 (8-bit Unicode Transformation Format) is a variable-length character encoding for Unicode, which is backwards compatible with ASCII.

PNG (Portable Network Graphics) is a lossless compression image format, suitable to store graphics with uniformly colored areas, and originally introduced as a free, open-source successor of GIF.

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

Scalable Vector Graphics (SVG) is an XML-based vector image format.

GIF (Graphics Interchange Format) is a lossless compression image format, originally introduced by CompuServe and suitable to store graphics, logos and simple animations.

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