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Conditional comments are conditional instruction interpreted by Internet Explorer. Conditional comments first time appeared in Internet Explorer 5 version. Conditional Comments website list
CSS (Cascading Style Sheets) is used for presentation of a document written in a HTML. It is a cornerstone website technology. Cascading Style Sheets was released Håkon Wium Lie in late 1994. CSS is used for change layout, colors, images and fonts of document presentation. Cascading Style Sheets website list
X-Frame-Options X-Frame-Options website list
XHTML (Extensible Hypertext Markup Language) is HTML standard for browser. XHTML website list