other metadata names W3C HTML5 http://www.w3.org/TR/html5/single-page.html#attr-data W3C HTML5 HTML(5) spec W3C HTML5 http://www.w3.org/TR/html5/single-page.html#attr-data http://www.w3.org/TR/html5/single-page.html W3C HTML5 Inter-element whitespace W3C HTML5 W3C HTML5 W3C HTML5 W3C HTML5 W3C HTML5 W3C HTML5 http://www.w3.org/TR/html5/single-page.html W3C HTML5 standard metadata names in HTML . W3C HTML5 W3C HTML5 W3C HTML5 W3C HTML5 W3C HTML5 W3C HTML5 W3C HTML5 W3C HTML5 W3C HTML5 W3C HTML5 W3C HTML5 single page W3C HTML5 W3C HTML5 W3C HTML5 input types W3C HTML5 W3C HTML5