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@@ -52,21 +52,19 @@ <H1><a name="q1.0">1 About the CSS 2.1 Specification</a></H1>
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<div><inputid=annoying-warningtype=checkboxtitle="hide note"><labelfor=annoying-warning>(hide)</label><divclass=annoying-warning><p><strong>Note:</strong> Several sections of this specification have been updated by other specifications. Please, see <ahref="https://www.w3.org/TR/CSS/#css" >"Cascading Style Sheets (CSS) — The Official Definition"</a> in the latest <cite>CSS Snapshot</cite> for a list of specifications and the sections they replace. <p>The CSS Working Group is also developing <ahref="http://www.w3.org/TR/CSS22/" >CSS level 2 revision 2 (CSS 2.2).</a></div></div>
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<h2>1.1 <aname="css2.1-v-css2">CSS 2.1 vs CSS 2</a></h2>
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<h2>1.1 <aname="css2.2-v-css2">CSS 2.2 vs CSS 2</a></h2>
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<p>The CSS community has gained significant experience with the CSS2
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specification since it became a recommendation in 1998. Errors in the
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CSS2 specification have subsequently been corrected via the
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publication of various errata, but there has not yet been an
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opportunity for the specification to be changed based on experience
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gained.
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CSS2 specification have subsequently been corrected in the first
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revised edition [[-CSS21]] in 2011, but new errata were necessary.
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<p>While many of these issues will be addressed by the upcoming CSS3
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<p>While many of the issues will be addressed by the upcoming CSS3
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specifications, the current state of affairs hinders the
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implementation and interoperability of CSS2. The CSS 2.1 specification
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implementation and interoperability of CSS2. The CSS 2.2 specification
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attempts to address this situation by:
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<ul>
@@ -80,7 +78,7 @@ <h2>1.1 <a name="css2.1-v-css2">CSS 2.1 vs CSS 2</a></h2>
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generally accepted practice.
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<li>Removing CSS2 features which, by virtue of not having been
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implemented, have been rejected by the CSS community. CSS 2.1 aims to
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implemented, have been rejected by the CSS community. CSS 2.2 aims to
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reflect what CSS features are reasonably widely implemented for HTML
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and XML languages in general (rather than <em>only</em> for a
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particular XML language, or <em>only</em> for HTML).
@@ -94,19 +92,20 @@ <h2>1.1 <a name="css2.1-v-css2">CSS 2.1 vs CSS 2</a></h2>
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</ul>
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<p>Thus, while it is not the case that a CSS2 style sheet is
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necessarily forwards-compatible with CSS 2.1, it is the case that a
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style sheet restricting itself to CSS 2.1 features is more likely to
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necessarily forwards-compatible with CSS 2.2, it is the case that a
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style sheet restricting itself to CSS 2.2 features is more likely to
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find a compliant user agent today and to preserve forwards
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compatibility in the future. While breaking forward compatibility is
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not desirable, we believe the advantages to the revisions in CSS 2.1
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not desirable, we believe the advantages to the revisions in CSS 2.2
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are worthwhile.
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<p>CSS 2.1 is derived from and is intended to replace CSS2. Some
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parts of CSS2 are unchanged in CSS 2.1, some parts have been
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<p>CSS 2.2 is derived from and is intended to replace
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CSS 2.1 and CSS2. Some parts of CSS2 are unchanged in
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CSS 2.2, some parts have been
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altered, and some parts removed. The removed portions may be used in a
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future CSS3 specification. Future specs should refer to CSS 2.1
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future CSS3 specification. Future specs should refer to CSS 2.2
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(unless they need features from CSS2 which have been dropped in
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CSS 2.1, and then they should only reference CSS2 for those
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CSS 2.2, and then they should only reference CSS2 for those
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features, or preferably reference such feature(s) in the respective
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CSS3 Module that includes those feature(s)).
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@@ -145,15 +144,15 @@ <h2>1.3 <a name="organization">How the specification is organized</a></h2>
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<dl>
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<dt><Strong>Section 2: An introduction to CSS 2.1</strong>
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<dt><Strong>Section 2: An introduction to CSS 2.2</strong>
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<dd>The introduction includes a brief tutorial on CSS 2.1 and
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a discussion of design principles behind CSS 2.1.
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<dd>The introduction includes a brief tutorial on CSS 2.2 and
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a discussion of design principles behind CSS 2.2.
@@ -52,7 +52,7 @@ <H1><a name="q19.0">Appendix A. Aural style sheets</a></H1>
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</ul>
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<div><inputid=annoying-warningtype=checkboxtitle="hide note"><labelfor=annoying-warning>(hide)</label><divclass=annoying-warning><p><strong>Note:</strong> Several sections of this specification have been updated by other specifications. Please, see <ahref="https://www.w3.org/TR/CSS/#css" >"Cascading Style Sheets (CSS) — The Official Definition"</a> in the latest <cite>CSS Snapshot</cite> for a list of specifications and the sections they replace. <p>The CSS Working Group is also developing <ahref="http://www.w3.org/TR/CSS22/" >CSS level 2 revision 2 (CSS 2.2).</a></div></div>
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<p>This chapter is informative. UAs are not required to implement the
<div><inputid=annoying-warningtype=checkboxtitle="hide note"><labelfor=annoying-warning>(hide)</label><divclass=annoying-warning><p><strong>Note:</strong> Several sections of this specification have been updated by other specifications. Please, see <ahref="https://www.w3.org/TR/CSS/#css" >"Cascading Style Sheets (CSS) — The Official Definition"</a> in the latest <cite>CSS Snapshot</cite> for a list of specifications and the sections they replace. <p>The CSS Working Group is also developing <ahref="http://www.w3.org/TR/CSS22/" >CSS level 2 revision 2 (CSS 2.2).</a></div></div>
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<P>The CSS box model describes the rectangular boxes that are
<div><inputid=annoying-warningtype=checkboxtitle="hide note"><labelfor=annoying-warning>(hide)</label><divclass=annoying-warning><p><strong>Note:</strong> Several sections of this specification have been updated by other specifications. Please, see <ahref="https://www.w3.org/TR/CSS/#css" >"Cascading Style Sheets (CSS) — The Official Definition"</a> in the latest <cite>CSS Snapshot</cite> for a list of specifications and the sections they replace. <p>The CSS Working Group is also developing <ahref="http://www.w3.org/TR/CSS22/" >CSS level 2 revision 2 (CSS 2.2).</a></div></div>
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<h2>6.1 <aname="value-stages">Specified, computed, and actual values</a></h2>
@@ -595,7 +595,7 @@ <H1><a name="q21.0">Appendix C. Changes</a></H1>
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<div><inputid=annoying-warningtype=checkboxtitle="hide note"><labelfor=annoying-warning>(hide)</label><divclass=annoying-warning><p><strong>Note:</strong> Several sections of this specification have been updated by other specifications. Please, see <ahref="https://www.w3.org/TR/CSS/#css" >"Cascading Style Sheets (CSS) — The Official Definition"</a> in the latest <cite>CSS Snapshot</cite> for a list of specifications and the sections they replace. <p>The CSS Working Group is also developing <ahref="http://www.w3.org/TR/CSS22/" >CSS level 2 revision 2 (CSS 2.2).</a></div></div>
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<P><em>This appendix is informative, not normative.</em></P>
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