HTML5 DocType Usage Statistics
The DOCTYPE is a required preamble for HTML5 websites.
Cascading Style Sheets Usage Statistics
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
Conditional Comments Usage Statistics
[url] uses conditional comments that are supported by Microsoft Internet Explorer. They allow web developers to show or hide HTML code based on the version of the viewer's browser.
X-Frame-Options Usage Statistics
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.
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