Nationalgeographic.com is built with the following tech stack:
Document Encoding
UTF-8
UTF-8 (8-bit UCS/Unicode Transformation Format) is a variable-length character encoding for Unicode. It is the preferred encoding for web pages.
Document Standards
X-UA-Compatible
Allows a website to define how a page is rendered in Internet Explorer 8, allowing a website to decide to use IE7 style rendering over IE8 rendering.
Open Graph Protocol
The Open Graph protocol enables any web page to become a rich object in a social graph, a open protocol supported by Facebook
Meta Description
The description attribute provides a concise explanation of the page content.
Twitter Cards
Twitter cards make it possible for you to attach media experiences to Tweets that link to your content.
Meta Robot
This page contains a meta robots tag which tells search engines and robots to index or not index the page.
Cascading Style Sheets
Cascading Style Sheets (CSS) is a stylesheet language used to describe the presentation of a document written in a markup language. Its most common application is to style web pages written in HTML
Canonical Content Tag
Public specification of a preferred URL for a page allows search engines to understand the original location for content.
HREF Lang
Contains language specific links.
Javascript
JavaScript is a scripting language most often used for client-side web development.
HTML5 DocType
The DOCTYPE is a required preamble for HTML5 websites.
HTML 5 Specific Tags
This page contains tags that are specific to an HTML 5 implementation.
Content Type Options
Used to disable MIME-sniffing for a particular HTTP response.
Mobile
Viewport Meta
This page uses the viewport meta tag which means the content may be optimized for mobile content.
Apple Mobile Web Clips Icon
This page contains an icon for iPhone, iPad and iTouch devices.
Language
United States HREF LANG
This webpage has alternate versions available in United States via the use of the hreflang tag.