The font Top Level Type

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Last updated 2016-12-11 (latest revision 2016-12-09)
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Network Working Group                                          C. Lilley
Internet-Draft                                                       W3C
Intended status: Standards Track                       December 09, 2016
Expires: June 12, 2017

                        The font Top Level Type


   This memo serves to register and document the "font" Top Level Type,
   under which the Internet Media subtypes for representation formats
   for fonts may be registered.  This document also serves as a
   registration application for a set of intended subtypes, which are
   representative of some existing subtypes already in use, and
   currently registered under the "application" tree by their separate

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on June 12, 2017.

Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   ( in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of

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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

1.  Specification Development

   [Note to the RFC Editor: Please remove this section upon

   This section is non-normative.  The source for this specification is
   maintained on GitHub [1].  The issues list [2] is also on GitHub.
   Discussion should be on the mailing list [3].

2.  Introduction

   The process of setting type in computer systems and other forms of
   text presentation systems uses fonts in order to provide visual
   representations of the glyphs.  Just as with images, for example,
   there are a number of ways to represent the visual information of the
   glyphs.  Early font formats often used bitmaps, as these could have
   been carefully tuned for maximum readability at a given size on low-
   resolution displays.  More recently, scalable vector outline fonts
   have come into widespread use: in these fonts, the outlines of the
   glyphs are described, and the presentation system renders the outline
   in the desired position and size.

   Over time, a number of standard formats for recording font
   descriptions have evolved.  This document defines a new top-level
   Internet Media Type "font" according to Section 4.2.7 of [RFC6838].
   This top-level type indicates that the content specifies font data.
   Under this top-level type, different representation formats of fonts
   may be registered.

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   document are to be interpreted as described in RFC 2119 [RFC2119].

3.  Background and Justification

   Historically there has not been a registration of formats for fonts.
   More recently, there have been several representation formats
   registered as media subtypes under the "application" top-level type
   (for example, application/font-woff).  However, with the rapid
   adoption of web fonts (based on the data from HTTP Archive
   [HTTP-Archive-Trends] showing a huge increase in web font usage from
   1% in the end of 2010 to 50% across all sites in the beginning of
   2015) custom fonts on the web have become a core web resource.  As
   the in-depth analysis [Font-Media-Type-Analysis] shows, the lack of
   the intuitive top-level font type is causing significant confusion

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   among developers - while currently defined font subtypes are severely
   under-utilized there are many more sites that already use non-
   existent (but highly intuitive) media types such as "font/woff",
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