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[css2] put changes since CSS1 back into changes appendix
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‎css2/changes.src‎

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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 2.10 1998-03-17 01:12:25 ijacobs Exp $ -->
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<!-- $Id: changes.src,v 2.11 1998-03-20 21:57:22 howcome 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 from CSS1</TITLE>
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</UL>
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-->
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<H2><a name="changes-from-css1">Semantic changes from CSS1</a></H2>
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<P>While all CSS1 style sheets are valid CSS2 style sheets, there are
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a few cases where the CSS1 style sheet will have a different meaning
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when interperted as a CSS2 style sheet. Most changes are due to
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implementation experience feeding back into the specification, but
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there are also some error corrections.
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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>CSS1 simply said that 'margin-right' was ignored if the both
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'margin-left' and 'width' were set. In CSS2 the choice between
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relaxing 'margin-right' or 'margin-left' depends on the 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 by introducing the term "containing block".
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<LI>The initial value of 'display' is 'inline' in CSS2, not 'block' as
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in CSS1.
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<LI>In CSS1, the 'clear' property applied to all elements. This was an
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error, and the property only applies to block-level elements in CSS2.
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<LI>In CSS1, <span class="index-inst"
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title="pseudo-classes:::link|:link|link
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(pseudo-class)">':link'</span>, <span class="index-inst"
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title="pseudo-classes:::visited|:visited|visited
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(pseudo-class)">':visited'</span> and <span class="index-inst"
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title="pseudo-classes:::active|:active|active
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(pseudo-class)">':active'</span> were mutually exclusive; in CSS2, <a
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href="selector.html#dynamic-pseudo-classes">':active'</a> can occur
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together with <a href="selector.html#link-pseudo-classes">':link' or
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':visited'</a>.
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<LI>The suggested scaling factor between adjacent <span
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class="propinst-font-size">'font-size'</span> indexes in the table of font
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sizes has been reduced from 1.5 to 1.2.
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<li>Please also consult the section on the <a
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href="grammar.html#tokenizer-diffs">differences between the CSS1
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and CSS2 tokenizer</a>.
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</UL>
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</BODY>
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</HTML>
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