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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.

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

Alibaba a Chinese e-commerce and cloud computing company.

Alibaba a Chinese e-commerce and cloud computing company.

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

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

The validity of the SSL certificate has expired.

The Google Advertising network consists of AdSense, DoubleClick and other services.

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

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/.

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

The Open Graph protocol, originally developed by Facebook, is an RDFa-based format that enables any web page to become a rich object in a social graph.

Twitter/X Cards enable automatic attachment of photos, videos and media elements to tweets.

JSON-LD (JavaScript Object Notation for Linked Data) is a method of encoding Linked Data using JSON.

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.

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