7993
INFORMATIONAL
Cascading Style Sheets (CSS) Requirements for RFCs
Authors: H. Flanagan
Date: December 2016
Stream: IAB
Abstract
The HTML format for RFCs assigns style guidance to a Cascading Style Sheet (CSS) specifically defined for the RFC Series. The embedded, default CSS as included by the RFC Editor is expected to take into account accessibility needs and to be built along a responsive design model. This document describes the requirements for the default CSS used by the RFC Editor. The class names are based on the classes defined in "HTML for RFCs" (RFC 7992).
RFC 7993
INFORMATIONAL
Internet Architecture Board (IAB) H. Flanagan
Request for Comments: 7993 RFC Editor
Category: Informational December 2016
ISSN: 2070-1721
<span class="h1">Cascading Style Sheets (CSS) Requirements for RFCs</span>
Abstract
The HTML format for RFCs assigns style guidance to a Cascading Style
Sheet (CSS) specifically defined for the RFC Series. The embedded,
default CSS as included by the RFC Editor is expected to take into
account accessibility needs and to be built along a responsive design
model. This document describes the requirements for the default CSS
used by the RFC Editor. The class names are based on the classes
defined in "HTML for RFCs" (<a href="./rfc7992">RFC 7992</a>).
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
This document is a product of the Internet Architecture Board (IAB)
and represents information that the IAB has deemed valuable to
provide for permanent record. It represents the consensus of the
Internet Architecture Board (IAB). Documents approved for
publication by the IAB are not a candidate for any level of Internet
Standard; see <a href="./rfc7841#section-2">Section 2 of RFC 7841</a>.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
<a href="https://www.rfc-editor.org/info/rfc7993">http://www.rfc-editor.org/info/rfc7993</a>.
Copyright Notice
Copyright (c) 2016 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to <a href="https://www.rfc-editor.org/bcp/bcp78">BCP 78</a> and the IETF Trust's Legal
Provisions Relating to IETF Documents
(<a href="http://trustee.ietf.org/license-info">http://trustee.ietf.org/license-info</a>) 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.
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Table of Contents
<a href="#section-1">1</a>. Introduction . . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-3">3</a>
<a href="#section-2">2</a>. Design Goal . . . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-3">3</a>
<a href="#section-3">3</a>. General Requirements . . . . . . . . . . . . . . . . . . . . <a href="#page-3">3</a>
<a href="#section-4">4</a>. Page Layout . . . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-4">4</a>
<a href="#section-4.1">4.1</a>. Title Page Header . . . . . . . . . . . . . . . . . . . . <a href="#page-4">4</a>
<a href="#section-4.2">4.2</a>. Body . . . . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-4">4</a>
<a href="#section-4.3">4.3</a>. Font Choices . . . . . . . . . . . . . . . . . . . . . . <a href="#page-4">4</a>
<a href="#section-5">5</a>. Printing . . . . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-4">4</a>
<a href="#section-6">6</a>. Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-5">5</a>
<a href="#section-7">7</a>. CSS Classes and Attributes . . . . . . . . . . . . . . . . . <a href="#page-5">5</a>
<a href="#section-7.1">7.1</a>. .alignCenter . . . . . . . . . . . . . . . . . . . . . . <a href="#page-5">5</a>
<a href="#section-7.2">7.2</a>. .alignRight . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-5">5</a>
<a href="#section-7.3">7.3</a>. .artwork . . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-5">5</a>
<a href="#section-7.3.1">7.3.1</a>. .art-ascii-art . . . . . . . . . . . . . . . . . . . <a href="#page-5">5</a>
<a href="#section-7.3.2">7.3.2</a>. .art-logo . . . . . . . . . . . . . . . . . . . . . . <a href="#page-5">5</a>
<a href="#section-7.4">7.4</a>. .cref . . . . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-5">5</a>
<a href="#section-7.5">7.5</a>. .crefAnchor . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-6">6</a>
<a href="#section-7.6">7.6</a>. .crefSource . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-6">6</a>
<a href="#section-7.7">7.7</a>. .dlCompact . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-6">6</a>
<a href="#section-7.8">7.8</a>. .dlHanging . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-6">6</a>
<a href="#section-7.9">7.9</a>. .dlParallel . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-6">6</a>
<a href="#section-7.10">7.10</a>. .docInfo . . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-6">6</a>
<a href="#section-7.11">7.11</a>. .eref . . . . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-6">6</a>
<a href="#section-7.12">7.12</a>. .finalized . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-6">6</a>
<a href="#section-7.13">7.13</a>. .note . . . . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-6">6</a>
<a href="#section-7.13.1">7.13.1</a>. .rfcEditorRemove . . . . . . . . . . . . . . . . . . <a href="#page-6">6</a>
<a href="#section-7.14">7.14</a>. .olCompact . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-7">7</a>
<a href="#section-7.15">7.15</a>. .olPercent . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-7">7</a>
<a href="#section-7.16">7.16</a>. .pilcrow . . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-7">7</a>
<a href="#section-7.17">7.17</a>. .relref . . . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-7">7</a>
<a href="#section-7.18">7.18</a>. .rendered . . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-7">7</a>
<a href="#section-7.19">7.19</a>. .sourcecode . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-7">7</a>
<a href="#section-7.20">7.20</a>. .toc . . . . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-7">7</a>
<a href="#section-7.21">7.21</a>. .type . . . . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-7">7</a>
<a href="#section-7.22">7.22</a>. .ulCompact . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-8">8</a>
<a href="#section-7.23">7.23</a>. .ulEmpty . . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-8">8</a>
<a href="#section-7.24">7.24</a>. .url . . . . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-8">8</a>
<a href="#section-7.25">7.25</a>. .xref . . . . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-8">8</a>
<a href="#section-8">8</a>. Security Considerations . . . . . . . . . . . . . . . . . . . <a href="#page-8">8</a>
<a href="#section-9">9</a>. References . . . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-8">8</a>
<a href="#section-9.1">9.1</a>. Normative References . . . . . . . . . . . . . . . . . . <a href="#page-8">8</a>
<a href="#section-9.2">9.2</a>. Informative References . . . . . . . . . . . . . . . . . <a href="#page-9">9</a>
<a href="#appendix-A">Appendix A</a>. List of Classes . . . . . . . . . . . . . . . . . . <a href="#page-10">10</a>
IAB Members at the Time of Approval . . . . . . . . . . . . . . . <a href="#page-14">14</a>
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-14">14</a>
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . <a href="#page-14">14</a>
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<span class="h2"><a class="selflink" id="section-1" href="#section-1">1</a>. Introduction</span>
The HTML format for RFCs, described in [<a href="./rfc7992" title=""HTML Format for RFCs"">RFC7992</a>], assigns style
guidance to a Cascading Style Sheet (CSS) specifically defined for
the RFC Series. This CSS will be embedded in the published HTML, and
it may be overridden by a locally defined CSS, as desired. The
embedded, default CSS as included by the RFC Editor is expected to
take into account accessibility needs and to be built along a
responsive design model.
This document describes the requirements for the default CSS used by
the RFC Editor. Unless called out otherwise, any styling provided
for these classes must not alter the natural language content in any
visible way. Many of these classes are provided to mark the elements
semantically: elements using them should simply inherit their
surrounding styling. Exceptions are listed below. A class is
identified for Internet-Drafts, such that certain features found only
in I-Ds may be made distinct in some fashion within those drafts.
The requirements will only be applied to HTML documents published by
the RFC Editor as per [<a href="./rfc7990" title=""RFC Format Framework"">RFC7990</a>].
The details included in this document are expected to change based on
experience gained in implementing the new publication toolsets.
Revised documents will be published capturing those changes as the
toolsets are completed. Other implementers must not expect those
changes to remain backwards compatible with the details included in
this document.
<span class="h2"><a class="selflink" id="section-2" href="#section-2">2</a>. Design Goal</span>
RFCs must be adaptable to a wide variety of devices and displays,
accessible to assisted readers, and printable.
<span class="h2"><a class="selflink" id="section-3" href="#section-3">3</a>. General Requirements</span>
o Support the display of the semantic HTML described in [<a href="./rfc7992" title=""HTML Format for RFCs"">RFC7992</a>].
o Follow best practice for accessibility, as defined by the W3C's
"Best Practices for Authoring HTML" [<a href="#ref-HTMLBP" title=""Best Practices for Authoring HTML Current Status"">HTMLBP</a>].
o Follow best practice for mobile devices, as defined by the W3C's
"Best Practices for Authoring HTML".
o Allow for a broad range of internationalized scripts.
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<span class="h2"><a class="selflink" id="section-4" href="#section-4">4</a>. Page Layout</span>
<span class="h3"><a class="selflink" id="section-4.1" href="#section-4.1">4.1</a>. Title Page Header</span>
The document header must be at the top of the document and include
all information described in "RFC Style Guide" [<a href="./rfc7322" title=""RFC Style Guide"">RFC7322</a>] and "RFC
Streams, Headers, and Boilerplates" [<a href="./rfc7841" title=""RFC Streams, Headers, and Boilerplates"">RFC7841</a>].
<span class="h3"><a class="selflink" id="section-4.2" href="#section-4.2">4.2</a>. Body</span>
The body of the document must conform to the following:
o Examples and code blocks must be in a fixed-width font
o ASCII art must be in a fixed-width font
o Reflow the text as the screen gets smaller and limit max width
o Block quotes must be indented
o Tables must allow for distinct header rows
o Paragraphs should include a hover-over paragraph identifier
All anchor tags and URLs should be clearly distinguished as links,
for example, through the use of color and/or text decoration,
following appropriate accessibility standards.
<span class="h3"><a class="selflink" id="section-4.3" href="#section-4.3">4.3</a>. Font Choices</span>
o Default to a sans-serif font family with broad Unicode support for
web browser viewing.
o Default to a serif font family with broad Unicode support for
printing.
o A fixed-width font must be used for code and artwork-tagged
sections.
o All fonts should be publicly licensed and supported by all major
web browsers.
<span class="h2"><a class="selflink" id="section-5" href="#section-5">5</a>. Printing</span>
The CSS must include support for a printer-friendly output. The
print rules should be a part of the embedded style sheet; consumers
of an RFC may develop their own print-specific style sheet, as
desired.
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<span class="h2"><a class="selflink" id="section-6" href="#section-6">6</a>. Lists</span>
Lists should provide ample whitespace between list elements for
legibility unless a 'compact' class is specified (e.g., .dlCompact,
.ulCompact, .olCompact).
<span class="h2"><a class="selflink" id="section-7" href="#section-7">7</a>. CSS Classes and Attributes</span>
This section describes the CSS classes that result in specific
changes to the natural language content of a document. A full list
of available classes, not including basic selectors, is included in
<a href="#appendix-A">Appendix A</a>.
<span class="h3"><a class="selflink" id="section-7.1" href="#section-7.1">7.1</a>. .alignCenter</span>
To be used with '.artwork' to indicate the figure should align in the
center of the page flow.
<span class="h3"><a class="selflink" id="section-7.2" href="#section-7.2">7.2</a>. .alignRight</span>
To be used with '.artwork' to indicate the figure should align on the
right of the page flow.
<span class="h3"><a class="selflink" id="section-7.3" href="#section-7.3">7.3</a>. .artwork</span>
These classes will mostly be styled as part of '.artwork'. Specific
classes may include '.art-ascii-art' and '.art-svg'. Artwork will be
held in its own block of space, centered in the page flow, and will
not float. Images should have a max width of 100% so views will
scale properly across a variety of screens and devices.
<span class="h4"><a class="selflink" id="section-7.3.1" href="#section-7.3.1">7.3.1</a>. .art-ascii-art</span>
Must use a mono-spaced font.
<span class="h4"><a class="selflink" id="section-7.3.2" href="#section-7.3.2">7.3.2</a>. .art-logo</span>
No visible changes to the natural language content; keep in default
style. Note that such images are not currently allowed in RFCs.
<span class="h3"><a class="selflink" id="section-7.4" href="#section-7.4">7.4</a>. .cref</span>
A comment within an I-D; should be visually distinct.
For I-Ds only; not for RFCs.
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<span class="h3"><a class="selflink" id="section-7.5" href="#section-7.5">7.5</a>. .crefAnchor</span>
A comment within an I-D; should be visually distinct.
For I-Ds only; not for RFCs.
<span class="h3"><a class="selflink" id="section-7.6" href="#section-7.6">7.6</a>. .crefSource</span>
A comment within an I-D; should be visually distinct.
For I-Ds only; not for RFCs.
<span class="h3"><a class="selflink" id="section-7.7" href="#section-7.7">7.7</a>. .dlCompact</span>
Use less spacing on a definition list than the default.
<span class="h3"><a class="selflink" id="section-7.8" href="#section-7.8">7.8</a>. .dlHanging</span>
Use the standard hanging indent for a definition list; indent terms.
<span class="h3"><a class="selflink" id="section-7.9" href="#section-7.9">7.9</a>. .dlParallel</span>
Do not use the standard hanging indent for a definition list; align
terms and definitions along left side.
<span class="h3"><a class="selflink" id="section-7.10" href="#section-7.10">7.10</a>. .docInfo</span>
Hide from visible content.
<span class="h3"><a class="selflink" id="section-7.11" href="#section-7.11">7.11</a>. .eref</span>
Standard link formatting (underlined, change in color).
<span class="h3"><a class="selflink" id="section-7.12" href="#section-7.12">7.12</a>. .finalized</span>
Hide from visible content.
<span class="h3"><a class="selflink" id="section-7.13" href="#section-7.13">7.13</a>. .note</span>
Notes should be emphasized and distinct from normal paragraph text.
<span class="h4"><a class="selflink" id="section-7.13.1" href="#section-7.13.1">7.13.1</a>. .rfcEditorRemove</span>
An RFC Editor note may be added after the standard boilerplate. It
should be visually distinct to highlight final removal of the note by
the RFC Editor.
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<span class="h3"><a class="selflink" id="section-7.14" href="#section-7.14">7.14</a>. .olCompact</span>
Use less spacing on a numbered list than the default.
<span class="h3"><a class="selflink" id="section-7.15" href="#section-7.15">7.15</a>. .olPercent</span>
If the style attribute from the source XML contains a percent sign, a
particular style setting will be required to make this setting behave
like an HTML ordered list.
<span class="h3"><a class="selflink" id="section-7.16" href="#section-7.16">7.16</a>. .pilcrow</span>
Pilcrows, when used as described in <a href="./rfc7992">RFC 7992</a>, should appear at the
end of the paragraph, artwork, or sourcecode segment. They should
not appear until moused-over. They should not show when printed, and
they should not be selected when copied with a copy/paste function.
<span class="h3"><a class="selflink" id="section-7.17" href="#section-7.17">7.17</a>. .relref</span>
Should be clearly distinguished as links.
<span class="h3"><a class="selflink" id="section-7.18" href="#section-7.18">7.18</a>. .rendered</span>
Hide from visible content.
<span class="h3"><a class="selflink" id="section-7.19" href="#section-7.19">7.19</a>. .sourcecode</span>
Code examples or components should be in a fixed-width font if the
human language used has an available fixed-width font option, and
they should be visually distinct. If no fixed-width font is
available, use the default font for that human language.
<span class="h3"><a class="selflink" id="section-7.20" href="#section-7.20">7.20</a>. .toc</span>
The table of contents should be clearly distinguished using an
indented, ordered list with the list style set to 'none', allowing
for hyperlinked, in-line dotted number notation (e.g., 1., 1.1.,
1.1.1.).
<span class="h3"><a class="selflink" id="section-7.21" href="#section-7.21">7.21</a>. .type</span>
No visible changes to the natural language content; keep in default
style.
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<span class="h3"><a class="selflink" id="section-7.22" href="#section-7.22">7.22</a>. .ulCompact</span>
Use less spacing on a bulleted list than the default.
<span class="h3"><a class="selflink" id="section-7.23" href="#section-7.23">7.23</a>. .ulEmpty</span>
Indent from the margin of the previous paragraph.
<span class="h3"><a class="selflink" id="section-7.24" href="#section-7.24">7.24</a>. .url</span>
Should be clearly distinguished as links.
<span class="h3"><a class="selflink" id="section-7.25" href="#section-7.25">7.25</a>. .xref</span>
Should be clearly distinguished as links.
<span class="h2"><a class="selflink" id="section-8" href="#section-8">8</a>. Security Considerations</span>
Security vulnerabilities can be introduced through the CSS, as with
CSS injection attacks [<a href="#ref-CSSATTACK">CSSATTACK</a>]. In order to avoid or mitigate any
attack vectors here, the CSS used must comply with the current CSS
Specifications from the W3C.
<span class="h2"><a class="selflink" id="section-9" href="#section-9">9</a>. References</span>
<span class="h3"><a class="selflink" id="section-9.1" href="#section-9.1">9.1</a>. Normative References</span>
[<a id="ref-HTMLBP">HTMLBP</a>] W3C, "Best Practices for Authoring HTML Current Status",
<<a href="http://www.w3.org/standards/techs/htmlbp">http://www.w3.org/standards/techs/htmlbp</a>>.
[<a id="ref-RFC7841">RFC7841</a>] Halpern, J., Ed., Daigle, L., Ed., and O. Kolkman, Ed.,
"RFC Streams, Headers, and Boilerplates", <a href="./rfc7841">RFC 7841</a>, DOI
10.17487/RFC7841, May 2016,
<<a href="https://www.rfc-editor.org/info/rfc7841">http://www.rfc-editor.org/info/rfc7841</a>>.
[<a id="ref-RFC7322">RFC7322</a>] Flanagan, H. and S. Ginoza, "RFC Style Guide", <a href="./rfc7322">RFC 7322</a>,
DOI 10.17487/RFC7322, September 2014,
<<a href="https://www.rfc-editor.org/info/rfc7322">http://www.rfc-editor.org/info/rfc7322</a>>.
[<a id="ref-RFC7990">RFC7990</a>] Flanagan, H., "RFC Format Framework", <a href="./rfc7990">RFC 7990</a>,
DOI 10.17487/RFC7990, December 2016,
<<a href="https://www.rfc-editor.org/info/rfc7990">http://www.rfc-editor.org/info/rfc7990</a>>.
[<a id="ref-RFC7992">RFC7992</a>] Hildebrand, J., Ed. and P. Hoffman, "HTML Format for
RFCs", <a href="./rfc7992">RFC 7992</a>, DOI 10.17487/RFC7992, December 2016,
<<a href="https://www.rfc-editor.org/info/rfc7992">http://www.rfc-editor.org/info/rfc7992</a>>.
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<span class="h3"><a class="selflink" id="section-9.2" href="#section-9.2">9.2</a>. Informative References</span>
[<a id="ref-CSSATTACK">CSSATTACK</a>]
Huang, L-S., Weinberg, Z., Evans, C., and C. Jackson,
"Protecting browsers from cross-origin CSS attacks", In
Proceedings of the 17th ACM conference on Computer and
communications security (CCS '10), pp. 619-629, 2010,
<<a href="https://doi.org/10.1145/1866307.1866376">https://doi.org/10.1145/1866307.1866376</a>>.
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<span class="h2"><a class="selflink" id="appendix-A" href="#appendix-A">Appendix A</a>. List of Classes</span>
This section lists all the CSS classes. Except for those also listed
in <a href="#section-7">Section 7</a>, none of these result in specific changes to the natural
language content of a document.
o .adr
o .alignCenter
o .alignRight
o .annotation
o .artwork
.art-ascii-art
.art-logo
.art-svg
o .ascii
o .author
o .authors
o .bcp14
o .center
o .city
o .compact
o .country-name
o .cref
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o .crefAnchor
o .crefSource
o .dlCompact
o .dlHanging
o .dlParallel
o .docInfo
o .ears
o .email
o .eref
o .finalized
o .fn
o .index
o .indexChar
o .indexIndex
o .indexItem
o .indexPrimary
o .indexSubItem
o .initial
o .iref
o .irefItem
o .irefRefs
o .irefSubItem
o .label
o .left
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o .locality
o .nameRole
o .note
.rfcEditorRemove
o .olCompact
o .olPercent
o .org
o .organization
o .pilcrow
o .postal-code
o .published
o .refContent
o .refDate
o .refInstance
o .refTitle
o .reference
o .region
o .relref
o .rendered
o .RFC
o .rfcEditorRemove
o .right
o .role
o .selfRef
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o .series
o .seriesInfo
o .sourcecode
.lang-*
o .street-address
o .status
o .street-address
o .surname
o .tel
o .toc
o .type
o .ulCompact
o .ulEmpty
o .url
o .workgroup
o .xref
o .vcard
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IAB Members at the Time of Approval
The IAB members at the time this memo was approved were (in
alphabetical order):
Jari Arkko
Ralph Droms
Ted Hardie
Joe Hildebrand
Russ Housley
Lee Howard
Erik Nordmark
Robert Sparks
Andrew Sullivan
Dave Thaler
Martin Thomson
Brian Trammell
Suzanne Woolf
Acknowledgements
With many thanks to the RFC Format Design Team for their efforts in
making this transition successful: Nevil Brownlee (ISE), Tony Hansen,
Joe Hildebrand, Paul Hoffman, Ted Lemon, Julian Reschke, Adam Roach,
Alice Russo, Robert Sparks (Tools Team liaison), and Dave Thaler.
Additional thanks to Arlen Johnson of Spherical Cow Group, LLC, for
his assistance in clarifying the requirements in more CSS-designer-
friendly language.
Author's Address
Heather Flanagan
RFC Editor
Email: [email protected]
URI: <a href="http://orcid.org/0000-0002-2647-2220">http://orcid.org/0000-0002-2647-2220</a>
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