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

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HTML 4.01 Transitional DTD

HTML 4.01 Transitional DTD Usage Statistics

Claims HTML 4.01 Transitional DTD, which includes presentation attributes and elements that W3C expects to phase out as support for style sheets matures.

X-UA-Compatible

X-UA-Compatible Usage Statistics

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 Robot

Meta Robot Usage Statistics

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

Font Face Rule

Font Face Rule Usage Statistics

The @font-face rule allows for linking to fonts that are automatically activated when needed.

Javascript

Javascript Usage Statistics

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

HTML 5 Specific Tags

HTML 5 Specific Tags Usage Statistics

This page contains tags that are specific to an HTML 5 implementation.

Content Type Options

Content Type Options Usage Statistics

Used to disable MIME-sniffing for a particular HTTP response.

The X-Frame-Options HTTP response header can be used to indicate whether or not a browser should be allowed to render a page in a frame or iframe. Sites can use this to avoid clickjacking attacks, by ensuring that their content is not embedded into other sites.

X-XSS-Protection

X-XSS-Protection Usage Statistics

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.