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[css2] updated list of changes
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<html lang="en">
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<HEAD>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<TITLE>Appendix B: Changes from CSS1</TITLE>
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<LINK rel="next" href="notes.html">
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<LINK rel="previous" href="sample.html">
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<LINK rel="STYLESHEET" href="style/default.css" type="text/css">
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</HEAD>
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<BODY>
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<div class="navbar" title="Navigation bar">
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<center>&nbsp;<a href="sample.html">previous</a> &nbsp; <a href="notes.html">next</a> &nbsp; <a href="cover.html#toc">contents</a> &nbsp; <a href="propidx.html">properties</a> &nbsp; <a href="descidx.html">descriptors</a> &nbsp; <a href="indexlist.html">index</a>
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</center><hr title="navigation bar separator">
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</div>
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<H1 align="center">Appendix B: Changes from CSS1</H1>
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<div class="subtoc"><p><strong>Contents</strong>
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<ol>
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<li><a href="#h-2.1">New functionality</a>
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<li><a href="#h-2.2">Updated descriptions</a>
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<li><a href="#h-2.3">Changes</a>
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</ol>
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</div>
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<P>CSS2 builds on <a rel="biblioentry" href="./refs.html#ref-CSS1"
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class="normref">[CSS1]</a> and all valid CSS1 stylesheets are valid
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CSS2 stylesheets. The changes between the <a
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href="http://www.w3.org/TR/REC-CSS1">CSS1 specification</a> and this
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specification fall into three groups: new functionality, updated
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descriptions of CSS1 functionality, and changes to CSS1.
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<H2><a name="h-2.1">2.1</a> New functionality</H2>
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<P>In addition to the functionality of CSS1, CSS2 supports:</p>
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<UL>
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<LI>The concept of <A HREF="media.html">Media types</A>
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<LI><A HREF="page.html">Paged media</A>
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<LI><A HREF="aural.html">Aural style sheets</A>
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<LI><A HREF="fonts.html#font-selection">An extended font selection</A>
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mechanism, including intelligent matching, synthesis, and downloadable
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fonts. Also, the concept of system fonts has been is introduced, and a
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new property, <span
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class="propinst-font-size-adjust">'font-size-adjust'</span>, has been added.
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<LI><A HREF="tables.html">Tables</A>, including new values on <a href="visuren.html#propdef-display" class="noxref"><span
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class="propinst-display">'display'</span></a> and <a href="visudet.html#propdef-vertical-align" class="noxref"><span
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class="propinst-vertical-align">'vertical-align'</span></a>
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<LI><A HREF="visuren.html#relative-positioning">Relative</A> and <A
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HREF="visuren.html#absolute-positioning">Absolute positioning</A>,
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including <A
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HREF="visuren.html#fixed-positioning">fixed positioning</A>.
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<LI>An extended <A HREF="selector.html">selector</A> mechanism,
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including child selectors, adjacent selectors and attribute selectors.
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<LI><A HREF="generate.html#generated-text">Generated content and automatic
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numbering</A> is possible.
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<LI>Text shadows are possible through the new <LI><span
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class="propinst-text-shadow">'text-shadow'</span> property.
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<LI>The :hover <A HREF="selector.html#anchor-pseudo-classes">anchor
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pseudo-class</A> has been added.
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<LI><A HREF="ui.html#system-colors">System colors</A> have been introduced.
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</UL>
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<H2><a name="h-2.2">2.2</a> Updated descriptions</H2>
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<P>The CSS1 specification was short and concise. This specification is
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more voluminous and readable. Much of the additional content
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describes new functionality, but the description of CSS1 features has
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also been extended. Except in a few cases described below, the
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rewritten descriptions do not indicate a change in syntax nor
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semantics.
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<H2><a name="h-2.3">2.3</a> Changes</H2>
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<UL>
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<LI>In CSS2 <A HREF="syndata.html#color-units">color values</A> are clipped
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with regard to the device gamut, not with regard to the sRGB gamut as
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in CSS1.
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<LI>[strength of constraints based on writing direction]
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<LI>In CSS1, several properties (e.g. 'padding') had values referring
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to the width of the parent element. This was an error; the value
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should always refer to the width of a block-level element and this
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specification reflects this.
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<LI>Initial value of 'display' is 'inline', not 'block' as in CSS1.
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<LI>'clear' applies to block level
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</UL>
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<div class="navbar" title="Navigation bar">
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<hr title="navigation bar separator"><center><a href="sample.html">previous</a> &nbsp; <a href="notes.html">next</a> &nbsp; <a href="cover.html#toc">contents</a> &nbsp; <a href="propidx.html">properties</a> &nbsp; <a href="descidx.html">descriptors</a> &nbsp; <a href="indexlist.html">index</a>
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</center></div>
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</BODY>
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</HTML>
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