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Site Info - Preventblindness.org
Overview of web technologies used by Preventblindness.org.
Prevent Blindness: A Lifetime of Healthy VisionPrevent Blindness brings Americans to eye care. Your donation today will fund outreach to people at the highest risk of vision loss. It will support quality
Description on Homepage
Prevent Blindness America
Description from Alexa
5 May 1997
Number 470,146 of all websites according to Alexa
Drupal is an open source content management system written in PHP, originally developed by Dries Buytaert.
PHP is a popular scripting language for creating web pages.
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.
External Cascading Style Sheets define style rules in a separate CSS file.
Inline Cascading Style Sheets define style rules directly within an (X)HTML element using the style attribute.
Persistent cookies with an expiration time between 1 month and 1 year.
HttpOnly cookies are used only in the HTTP protocol and not in client side scripts, which may increase security.
Secure cookies are used only via an encrypted connections, which may increase security.
Gzip (GNU zip) is a file compression algorithm.
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.
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/.
Non-secure cookies may be used via an unencrypted connections, which may be a security threat.
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.
SPDY (pronounced speedy) is a web protocol developed by Google, the basis for HTTP/2.
Generic RDFa (Resource Description Framework in attributes) is RDFa without further specialization.
IdenTrust is a SSL certificate authority.
The SSL certificate is invalid because it is not issued for the domain where it is used.
Comodo provides IT services, software, and SSL certificates under various brand names.
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.
Nginx (pronounced as "engine X") is a lightweight open source web server developed by Igor Sysoev.
Rackspace is a managed cloud computing company based in USA.
CloudFlare provides a content delivery network.
Fastly is a content delivery network.
The technology score rates a site based on its technologies in a range from 0 to 100. It consists in a popularity score (how many sites use the same technologies), a traffic score (how much traffic have other sites using the same technologies) and a version score (how many sites use more recent technology versions). Quality alerts also affect the rating.
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