Yahoo.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
DNS Prefetch
Page contains links to disable or enable DNS prefetching of links in the page.
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.
Meta Description
The description attribute provides a concise explanation of the page content.
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 Keywords
Meta tag containing keywords related to the page.
Web App Manifest
Defines the attributes of a web app in a simple JSON file. It describes how the web app should appear on the users system and how it should launch.
HREF Lang
Contains language specific links.
Canonical Content Tag
Public specification of a preferred URL for a page allows search engines to understand the original location for content.
Javascript
JavaScript is a scripting language most often used for client-side web development.
Javascript Defer
The defer attribute gives a hint to the browser that the script does not create any content so the browser can optionally defer interpreting the script. This can improve performance by delaying execution of scripts until after the body content is parsed and rendered.
JSON-LD
JSON-LD, or JavaScript Object Notation for Linked Data, is a method of transporting Linked Data using JSON.
Referrer Policy
Requests made from a document, and for navigations away from that document are associated with a Referrer header. This policy determines in the browser should send a referrer or not.
Prefers Color Scheme
Defines how a page looks based on the color scheme choosen by the user for their desktop.
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 Security Policy
Content Security Policy is a computer security concept, to prevent cross-site scripting XSS attacks.
Report URI CSP
Report-uri directive instructs the user agent to report attempts to violate the Content Security Policy.
X-XSS-Protection
X-XSS-Protection is a HTTP header set by Internet Explorer 8+. This header lets domains toggle on and off the "XSS Filter" of IE8, which prevents some categories of XSS attacks.
Content Type Options
Used to disable MIME-sniffing for a particular HTTP response.
Referrer Policy
Requests made from a document, and for navigations away from that document are associated with a Referrer header. This policy determines in the browser should send a referrer or not.
Strict Transport Security
The HTTP Strict-Transport-Security (HSTS) header instructs the browser to only use https.
Language
Germany HREF LANG
This webpage has alternate versions available in Germany via the use of the hreflang tag.
Australia HREF LANG
This webpage has alternate versions available in Australia via the use of the hreflang tag.
Canada HREF LANG
This webpage has alternate versions available in Canada via the use of the hreflang tag.
United Kingdom HREF LANG
This webpage has alternate versions available in United Kingdom via the use of the hreflang tag.
India HREF LANG
This webpage has alternate versions available in India via the use of the hreflang tag.
Singapore HREF LANG
This webpage has alternate versions available in Singapore via the use of the hreflang tag.
United States HREF LANG
This webpage has alternate versions available in United States via the use of the hreflang tag.
Spain HREF LANG
This webpage has alternate versions available in Spain via the use of the hreflang tag.
United States HREF LANG
This webpage has alternate versions available in United States via the use of the hreflang tag.
Belgium HREF LANG
This webpage has alternate versions available in Belgium via the use of the hreflang tag.
France HREF LANG
This webpage has alternate versions available in France via the use of the hreflang tag.
Italy HREF LANG
This webpage has alternate versions available in Italy via the use of the hreflang tag.
Belgium HREF LANG
This webpage has alternate versions available in Belgium via the use of the hreflang tag.
Brazil HREF LANG
This webpage has alternate versions available in Brazil via the use of the hreflang tag.
Hong Kong HREF LANG
This webpage has alternate versions available in Hong Kong via the use of the hreflang tag.
Taiwan HREF LANG
This webpage has alternate versions available in Taiwan via the use of the hreflang tag.
SSL Certificates
HSTS
Forces browsers to only communicate with the site using HTTPS.
Advertising
comScore
Market research company that studies internet trends and behavior.
Analytics and Tracking
comScore
Market research company that studies internet trends and behavior.
Mobile
Apple Mobile Web App Capable
Launches a web application for Safari on iOS in full-screen mode to look like a native application.
IPhone / Mobile Compatible
The website contains code that allows the page to support IPhone / Mobile Content.
Viewport Meta
This page uses the viewport meta tag which means the content may be optimized for mobile content.
Mobile Non Scaleable Content
This content is formatted for mobile devices, it does not allow the content to be scaled.
Apple Mobile Web Clips Icon
This page contains an icon for iPhone, iPad and iTouch devices.