Yahoo! Stack

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.