Website forum.arduino.cc

Facebook Ads Advertisers.

DoubleClick Advertisers.

DoubleClick is a provider of digital marketing technology and services. Companies come to DoubleClick for expertise in ad serving, media, video, search and affiliate marketing to help them make the most of the digital medium.

Facebook Retargeting Pixel

Show you how visitors are really using your website, collect feedback and turn more visitors into customers.

Websites embedding Google maps.

The Free Wiki World Map – An openly licensed map of the world being created by volunteers using local knowledge, GPS tracks and donated sources.

Google Tag Manager makes it easy for marketers to add and update website tags including analytics, remarketing, and more.

nginx [engine x] is a HTTP server and mail proxy server written by Igor Sysoev.

Discourse is the 100% open source discussion platform built for the next decade of the Internet. It works as a mailing list, a discussion forum and a long-form chat room.Discourse is a simple, flat forum, where replies flow down the page in a line.

A family of standard web feed formats used to publish frequently updated information like blog entries, news headlines, audio and video.

Open graph type entity tag

Open graph url entity tag

The Open Graph protocol enables any web page to become a rich object in a social graph, a open protocol supported by Facebook

Open graph image entity tag

Open graph site name entity tag

Open graph description entity tag

Chrome for Android, since version 39 supports the "theme-color" meta tag to allow websites control the background color of the tab's UI header.

Meta descriptions are HTML attributes that provide concise explanations of the contents of web pages. Meta descriptions are commonly used on search engine result pages (SERPs) to display preview snippets for a given page.

The http-equiv attribute provides an HTTP header for the information/value of the content attribute. The http-equiv attribute can be used to simulate an HTTP response header.

Indicates that the site provides an interface specifically for searching the document and its related resources.

A canonical link element is an HTML element that helps webmasters prevent duplicate content issues by specifying the "canonical", or "preferred".

Google's hosted library for web fonts. Allows websites to choose and use fonts from a free, wide variety of fonts.

Sites using Html 5 SVG Tag

UTF-8 (8-bit UCS/Unicode Transformation Format) is a variable-length character encoding for Unicode. It is the preferred encoding for web pages.

A scheme.org entity that represents an organization such as a school, NGO, corporation, club, etc.

A scheme.org entity that represents a person (alive, dead, undead, or fictional).