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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.

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

Caddy is an open-source web server implemented in Go.

Cloudflare Server is a web server developed by Cloudflare.

The Vietnam Posts and Telecommunications Group (VNPT) is a Vietnamese telecommunications company.

The Vietnam Posts and Telecommunications Group (VNPT) is a Vietnamese telecommunications company.

Cloudflare provides a content delivery network.

Cloudflare provides DNS servers and other web services.

Gmail is the email service provided by Google.

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

IdenTrust is a SSL certificate authority.

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

unpkg is a JavaScript content delivery network for libraries that use the npm package manager.

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

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.

HTTP/3 is the third major version of the HTTP network protocol, derived from the QUIC protocol.

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

Brotli is a lossless compression algorithm developed by Google.

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 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 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.

Generic RDFa (Resource Description Framework in attributes) is RDFa without further specialization.

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.

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

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