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Site Info - Preventblindness.org
Overview of web technologies used by Preventblindness.org.
Prevent Blindness: A Lifetime of Healthy Vision
Description on Homepage
Prevent Blindness America
Description from Alexa
5 May 1997
Number 665,404 of all websites according to Alexa
Website Quality Alerts
Found on page http://preventblindness.org/
At our the last visit we found the server time to be approximately 13 minutes slow.
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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.
JPEG (Joint Photographic Experts Group) is a lossy compression method suitable to store photographic images.
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.
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.
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 SSL certificate is invalid because it is not issued for the domain where it is used.
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.
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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