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[css2] Added changes of tables chapter. Moved "Changes" section to the top.
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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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<!-- $Id: changes.src,v 2.31 2002-08-09 13:03:27 bbos Exp $ -->
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<!-- $Id: changes.src,v 2.32 2002-11-28 20:53:54 bbos Exp $ -->
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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</TITLE>
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<P>CSS&nbsp;2.1 is an updated version of CSS2. The changes between the CSS2
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specification (see [[CSS2]]) and this specification fall into four
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groups: known errors, typographical errors, clarifications, and
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changes.</P>
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changes. Typographical errors are not listed here.</P>
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<h3><a name="changes">Changes</a></h3>
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<h4 id="s-6-4-3"><a href="cascade.html#specificity">Section 6.4.3
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Calculating a selector's specificity</a></h4>
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<p>The "style" attribute now has a higher specificity than any style
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rule.
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<h4 id="s-6-4-4"><a href="cascade.html#q12">Section 6.4.4 Precedence
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of non-CSS presentational hints</a></h4>
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<p>If presentational hints from other sources than CSS are taken into
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account by a UA, it must treat them as having the same weight as the
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user agent's default style sheet.
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<h4 id="visuren"><a href="visuren.html">Chapter 9 Visual formatting
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model</a></h4>
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<p>The value 'compact' for 'display' does not exist in CSS&nbsp;2.1.
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'Inline-block' is added.
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<h4 id="s-10-3-7"><a
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href="visudet.html#abs-non-replaced-width">Section 10.3.7 Absolutely
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positioned, non-replaced elements</a></h4>
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<p>Absolutely positioned elements can now "shrink-wrap" their
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contents:
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<p>When both 'width' and 'right' (or 'width' and 'left') are 'auto',
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the element's computed width is the width of the contents (using an
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algorithm similar to that for table cells) and then 'right' (or
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'left') is solved. CSS2 incorrectly said that 'right' (or 'left') was
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set to 0 in that case, and then width was solved.
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<h4 id="s-10-6-4"><a
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href="visudet.html#abs-non-replaced-height">Section 10.6.4 Absolutely
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positioned, non-replaced elements</a></h4>
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<p>Like normal-flow block-level elements, absolutely positioned
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elements by default take on the height of their contents
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("shrink-wrap"). If 'height' and 'bottom' are both 'auto', the
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computed value of 'height' is set to the height of the contents and
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then 'bottom' is solved. CSS2 incorrectly said the reverse: 'bottom'
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was set to 0 and then height was solved.
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<h4 id="x88"><a href="visufx.html#clipping">Section 11.1.2</a></h4>
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<p>While CSS2 specified that values of "rect()" give offsets from the
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respective sides of the box, current implementations interpret values
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with respect to the top and left edges for <em>all</em> four values
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(top, right, bottom, and left). This is now the correct
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interpretation.
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<h4 id="s-17-4-1"><a href="tables.html#q6">17.4.1 Caption position
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and alignment</a></h4>
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<p>The 'left' and 'right' values on 'caption-side' have been removed.
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<h4 id="s-17-5-4"><a href="tables.html#column-alignment">17.5.4
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Horizontal alignment in a column</a></h4>
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<p>The &lt;string&gt; value for 'text-align' is not part of
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CSS&nbsp;2.1.
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<h4 id="s-17-6"><a href="tables.html#borders">Section 17.6
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Borders</a></h4>
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<p>Several popular browsers assume an initial value for
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'border-collapse' of 'separate' rather than 'collapse' or exhibit
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behavior that is close to that value, even if they do not actually
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implement the CSS table model. 'Separate' is now the initial value.
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<h4 id="s-12"><a href="generate.html">Chapter 12 Generated content,
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automatic numbering, and lists</a></h4>
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<p>The 'marker' value for 'display' does not exist in CSS&nbsp;2.1
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<h4 id="s-12-2"><a href="generate.html#propdef-content">Section 12.2
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The 'content' property</a></h4>
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<p>The '&lt;uri&gt;' value is dropped.
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<h4 id="s-15"><a href="fonts.html">Chapter 15 Fonts</a></h4>
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<p>The 'font-stretch' and 'font-size-adjust' properties don't exist in
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CSS&nbsp;2.1.
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<p>Font descriptors and the '@font-face' declaration don't exist in
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CSS&nbsp;2.1.
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<h4 id="s-18-1"><a href="ui.html#cursor-props">Section 18.1 Cursors:
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the 'cursor' property</a></h4>
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<p>The value 'progress' is added.
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<h4 id="text"><a href="text.html">Chapter 16 Text</a></h4>
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<p>The 'text-shadow' property is not in CSS&nbsp;2.1.
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<h4 id="a-a"><a href="aural.html">Appendix A. Aural style
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sheets</a></h4>
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<p>Chapter 19 on aural style sheets has become appendix A and is not
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normative in CSS&nbsp;2.1. Related units (deg, grad, rad, ms, s, Hz,
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kHz) are also moved to this appendix, as is the 'speak-header'
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property from the "tables" chapter.
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<h4 id="a-a-6"><a href="aural.html#">
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<h4 id="page"><a href="page.html">Page breaks</a></h4>
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<p>Only the 'page-break-before', 'page-break-after' and
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'page-break-inside' properties are in CSS&nbsp;2.1.
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<h4 id="other">Other</h4>
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<p>The former informative appendix C, "Implementation and
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performance notes for fonts," is left out of CSS&nbsp;2.1.
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<h3><a name="known-errors">Errors</a></h3>
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have margins.
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</blockquote>
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<h4 id="s-17-5-1"><a href="tables.html#table-layers">Section 17.5.1
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Table layers and transparency</a></h4>
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<p>The rows and columns only cover the whole table in the collapsed
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borders model, not in the separated borders model. The points 2, 3, 4
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and 5 have been corrected to define the area covered by rows, columns,
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row groups and column groups in terms of the cells they cover.
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<h4 id="x28"><a href="tables.html#separated-borders">Section 17.6.1 The
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separated borders model</a></h4>
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"empty" cells are transparent' to:
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<blockquote>
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<p>These "empty" cells are transparent if the value of their 'empty-cells'
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property is 'hide'</blockquote>
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<p>If the value of their 'empty-cells' property is 'hide'
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these "empty" cells are transparent through the cell, row, row group,
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column, and column group backgrounds, letting the table background
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show through.</blockquote>
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<p>To remove ambiguity about the position of backgrounds on rows and
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column, the following paragraph was added after point 6:
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<blockquote><p>the edges of the rows, columns, row groups and column
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groups in the <a href="#collapsing-borders">collapsing borders
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model</a> concide with the hypothetical grid lines on which the
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borders of the cells are centered. (And thus, in this model, the rows
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together exactly cover the table, leaving no gaps; ditto for the
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columns.) In the <a href="#separated-borders">separated borders
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model,</a> the edges coincide with the <a
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href="box.html#border-edge">border edges</a> of cells. (And thus, in
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this model, there may be gaps between the rows and columns,
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corresponding to the <span
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class="propinst-border-spacing">'border-spacing'</span>
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property.)</blockquote>
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<p>At the end of the section
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added the following paragraph:
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<p>The WG may introduce ways of automatically making tables fit their
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containing blocks in CSS3.
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<h4 id="s-17-6-1"><a href="tables.html#separated-borders">17.6.1 The separated borders model</a></h4>
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<p>Added clarification about alignment of row/column backgrounds. The
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sentence "This space is filled with the background of the table
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element" was replaced by:
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<blockquote>In this space, the row, column, row group, and column
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group backgrounds are invisible, allowing the table background to show
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through.</blockquote>
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<h4 id="x79"><a href="tables.html#empty-cells">Borders around empty cells: the
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'empty-cells' property</a></h4>
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<p>The entry for "[URI]" referred to a draft that has become an RFC.
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The entry has been changed.
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<h3><a name="changes">Changes</a></h3>
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<h4 id="s-6-4-3"><a href="cascade.html#specificity">Section 6.4.3
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Calculating a selector's specificity</a></h4>
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<p>The "style" attribute now has a higher specificity than any style
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rule.
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<h4 id="s-6-4-4"><a href="cascade.html#q12">Section 6.4.4 Precedence
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of non-CSS presentational hints</a></h4>
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<p>If presentational hints from other sources than CSS are taken into
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account by a UA, it must treat them as having the same weight as the
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user agent's default style sheet.
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<h4 id="visuren"><a href="visuren.html">Chapter 9 Visual formatting
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model</a></h4>
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<p>The value 'compact' for 'display' does not exist in CSS&nbsp;2.1.
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'Inline-block' is added.
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<h4 id="s-10-3-7"><a
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href="visudet.html#abs-non-replaced-width">Section 10.3.7 Absolutely
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positioned, non-replaced elements</a></h4>
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<p>Absolutely positioned elements can now "shrink-wrap" their
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contents:
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<p>When both 'width' and 'right' (or 'width' and 'left') are 'auto',
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the element's computed width is the width of the contents (using an
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algorithm similar to that for table cells) and then 'right' (or
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'left') is solved. CSS2 incorrectly said that 'right' (or 'left') was
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set to 0 in that case, and then width was solved.
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<h4 id="s-10-6-4"><a
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href="visudet.html#abs-non-replaced-height">Section 10.6.4 Absolutely
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positioned, non-replaced elements</a></h4>
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<p>Like normal-flow block-level elements, absolutely positioned
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elements by default take on the height of their contents
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("shrink-wrap"). If 'height' and 'bottom' are both 'auto', the
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computed value of 'height' is set to the height of the contents and
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then 'bottom' is solved. CSS2 incorrectly said the reverse: 'bottom'
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was set to 0 and then height was solved.
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<h4 id="x88"><a href="visufx.html#clipping">Section 11.1.2</a></h4>
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<p>While CSS2 specified that values of "rect()" give offsets from the
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respective sides of the box, current implementations interpret values
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with respect to the top and left edges for <em>all</em> four values
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(top, right, bottom, and left). This is now the correct
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interpretation.
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<h4 id="s-17-4-1"><a href="tables.html#q6">17.4.1 Caption position
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and alignment</a></h4>
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<p>The 'left' and 'right' values on 'caption-side' have been removed.
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<h4 id="s-17-5-4"><a href="tables.html#column-alignment">17.5.4
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Horizontal alignment in a column</a></h4>
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<p>The &lt;string&gt; value for 'text-align' is not part of
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CSS&nbsp;2.1.
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<h4 id="s-17-6"><a href="tables.html#borders">Section 17.6
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Borders</a></h4>
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<p>Several popular browsers assume an initial value for
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'border-collapse' of 'separate' rather than 'collapse' or exhibit
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behavior that is close to that value, even if they do not actually
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implement the CSS table model. 'Separate' is now the initial value.
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<h4 id="s-12"><a href="generate.html">Chapter 12 Generated content,
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automatic numbering, and lists</a></h4>
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<p>The 'marker' value for 'display' does not exist in CSS&nbsp;2.1
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<h4 id="s-12-2"><a href="generate.html#propdef-content">Section 12.2
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The 'content' property</a></h4>
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<p>The values '&lt;uri&gt;' and &lt;counter&gt; are dropped.
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<h4 id="s-15"><a href="fonts.html">Chapter 15 Fonts</a></h4>
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<p>The 'font-stretch' and 'font-size-adjust' properties don't exist in
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CSS&nbsp;2.1.
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<p>Font descriptors and the '@font-face' declaration don't exist in
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CSS&nbsp;2.1.
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<h4 id="s-18-1"><a href="ui.html#cursor-props">Section 18.1 Cursors:
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the 'cursor' property</a></h4>
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<p>The value 'progress' is added.
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<h4 id="text"><a href="text.html">Chapter 16 Text</a></h4>
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<p>The 'text-shadow' property is not in CSS&nbsp;2.1.
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<h4 id="a-a"><a href="aural.html">Appendix A. Aural style
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sheets</a></h4>
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<p>Chapter 19 on aural style sheets has become appendix A and is not
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normative in CSS&nbsp;2.1. Related units (deg, grad, rad, ms, s, Hz,
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kHz) are also moved to this appendix, as is the 'speak-header'
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property from the "tables" chapter.
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<h4 id="page"><a href="page.html">Page breaks</a></h4>
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<p>Only the 'page-break-before', 'page-break-after' and
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'page-break-inside' properties are in CSS&nbsp;2.1.
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<h4 id="other">Other</h4>
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<p>The former informative appendix C, "Implementation and
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performance notes for fonts," is left out of CSS&nbsp;2.1.
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