Web standards not a single standard, but a collection developed by W3C and other standards organizations a series of standards. Including structure (Structure), performance (Presentation) and behavior (Behavior) three.
Standard Structure: Structural page elements for sorting and classification, including XML and XHTML two parts.
Style Standard: performance is used to set page elements layout, color, size and other exterior style, mainly refers to the CSS.
Standards of conduct: action refers to the preparation of the definition and interactive web models, including two of the DOM and ECMAScript