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Quora.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

Meta Robot

This page contains a meta robots tag which tells search engines and robots to index or not index the page.

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

Twitter Cards

Twitter cards make it possible for you to attach media experiences to Tweets that link to your content.

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.

Javascript

JavaScript is a scripting language most often used for client-side web development.

WAI-ARIA

A way to make Web content and Web applications more accessible to people with disabilities. It especially helps with dynamic content and advanced user interface controls developed with Ajax, HTML, JavaScript, and related technologies.

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.

Strict Transport Security

The HTTP Strict-Transport-Security (HSTS) header instructs the browser to only use https.

SSL Certificates

HSTS

Forces browsers to only communicate with the site using HTTPS.

Mobile

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.