[4] Wayback Machine, https://web.archive.org/web/19991013185736/http://members.tripod.com/%7Ebeso/NS-2.HTM
[1] Dynamic HTML in Communicator ( 版) http://web.archive.org/web/19971016003150/developer.netscape.com/library/documentation/communicator/dynhtml/webfont1.htm#1032362
[2] HTML 5 ( 版) http://www.whatwg.org/specs/web-apps/current-work/#fonts-and-colors
When a font element has a pointsize attribute, the user agent is expected to parse that attribute's value using the rules for parsing non-negative integers, and if this doesn't generate an error, then the user agent is expected to use the parsed value as a point length for a presentational hint for the 'font-size' property on the element.
[3] (X)HTML5 Tracking ( 版) http://html5.org/tools/web-apps-tracker?from=4024&to=4025