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SquirrelMail is a webmail client written in PHP.

PHP is a scripting language for creating websites.

Java is a general-purpose language originally developed by Sun Microsystems.

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

jQuery is a JavaScript library that simplifies HTML document traversing, event handling, animating and Ajax interaction. Originally developed by John Resig.

MooTools (My Object-Oriented Tools) is a modular, object-oriented JavaScript framework, originally developed by Valerio Proietti.

Bootstrap is an open source HTML, CSS, and JavaScript framework.

Popper is an open source JavaScript library for tooltips and popovers.

Moment.js is a library to manipulate dates in JavaScript.

Bootstrap is an open source HTML, CSS, and JavaScript framework.

Foundation is a responsive front-end framework based on the Zurb style guide.

Animate is a CSS library focusing on animations.

The Apache HTTP Server is an open source web server by the Apache Software Foundation.

Sectigo (formerly Comodo CA) is a US-based SSL certificate authority.

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

Google Hosted Libraries (formerly called Google Libraries API) is a content distribution network for the most popular, open-source JavaScript libraries, provided by Google.

The CDNJS is a content distribution network, hosting a large number of JavaScript libraries, provided by CloudFlare.

The jQuery CDN hosts copies of the jQuery library, provided by MaxCDN.

Google Analytics is a free service to get detailed statistics about the visitors of a website, provided by Google. This includes the Ads conversion tracking and the Floodlight services.

Meta Pixel (formerly Facebook Pixel) is an analytics tool to track actions on websites.

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

The Google Tag Manager is a Google service to support webmasters to manage tags on their websites.

A Twitter/X Button allows a Twitter user to post a tweet from the visited site.

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.

Session cookies are temporary cookies, which are deleted when the user closes the browser.

HttpOnly cookies are used only in the HTTP protocol and not in client side scripts, which may increase security.

Non-HttpOnly cookies are used in the HTTP protocol and also in client side scripts, which may be a security threat.

Secure cookies are used only via an encrypted connections, which may increase security.

Non-secure cookies may be used via an unencrypted connections, which may be a security threat.

Gzip (GNU zip) is a file compression algorithm.

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

Microdata is a specification to integrate metadata within existing content on web pages.

Transitional version of XHTML.

HTML5 is the fifth revision of the HTML standard.

Transitional version of HTML.

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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