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[css2] Some BIDI updates
--HG-- extra : convert_revision : svn%3A73dc7c4b-06e6-40f3-b4f7-9ed1dbc14bfc/trunk%401364
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‎css2/sample.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: sample.src,v 2.11 1998-03-15 22:52:07 bbos Exp $ -->
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<!-- $Id: sample.src,v 2.12 1998-03-23 06:37:54 ijacobs 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 A: A sample style sheet for HTML 4.0</TITLE>
@@ -88,6 +88,21 @@ ABBR, ACRONYM {font-variant: small-caps; letter-spacing: 0.1em}
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A[href] {text-decoration: underline}
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:focus {outline: thin dotted invert}
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/* For Unicode bidi */
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BDO[DIR="ltr"] { direction: ltr; unicode-bidi: bidi-override }
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BDO[DIR="rtl"] { direction: rtl; unicode-bidi: bidi-override }
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*[DIR="ltr"] { direction: ltr; unicode-bidi: embed }
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*[DIR="rtl"] { direction: rtl; unicode-bidi: embed }
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/* Block-level elements */
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ADDRESS, BLOCKQUOTE, BODY, DD, DIV, DL, DT, FIELDSET,
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FORM, FRAME, FRAMESET, H1, H2, H3, H4, H5, H6, IFRAME,
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NOSCRIPT, NOFRAMES, OBJECT, OL, P, UL, APPLET, CENTER,
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DIR, HR, MENU, PRE, LI, TABLE, TR, THEAD, TBODY, TFOOT,
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COL, COLGROUP, TD, TH, CAPTION
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{ unicode-bidi: embed }
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/* Begin aural section */
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/* The following rules have been adapted from
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suggestions by T.V. Raman.

‎css2/visuren.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: visuren.src,v 2.38 1998-03-23 05:04:01 ijacobs Exp $ -->
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<!-- $Id: visuren.src,v 2.39 1998-03-23 06:37:41 ijacobs 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>Visual rendering model</TITLE>
@@ -709,14 +709,15 @@ class="propinst-text-align">'text-align'</span> property. If that
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property has the value 'justify', the user agent may stretch the
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inline boxes as well.
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<P>Since a box may not exceed the width of a line box, long boxes are
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split into several boxes and these boxes distributed across several
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line boxes. When a box is split, margins, borders, and padding have no
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visual effect at the end of the first line box or at the beginning of
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the next line box.
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<P>Since an inline box may not exceed the width of a line box, long
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inline boxes are split into several boxes and these boxes distributed
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across several line boxes. When an inline box is split, margins,
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borders, and padding have no visual effect where the split occurs.
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Rendering of margins, borders, and padding may not be fully defined if
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the split occurs within a bidirectional embedding.
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<P>Inline boxes may also be split into several boxes <em>in the same
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line box</em> due to <a href="#direction">bidirectional text
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<P>Inline boxes may also be split into several boxes <em>within the
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same line box</em> due to <a href="#direction">bidirectional text
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processing</a>.
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<div class="html-example"><P>
@@ -1740,15 +1741,21 @@ property to have any effect on inline-level elements, the <span
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class="propinst-unicode-bidi">'unicode-bidi'</span> property must have
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as value either 'embed' or 'override'.
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<P>If a default style sheet specifies values for <span
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class="propinst-unicode-bidi">'unicode-bidi'</span>, authors and users
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should not specify rules to override them.
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<!-- Should the above be must? Should mention be made of the
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cascade? -IJ -->
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<p>The following example shows an XML document with bidirectional
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text. It illustrates an important design principle: <span
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class="index-inst" title="DTD">DTD</span> designers should take bidi
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into account both in the language proper (elements and attributes) and
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in any accompanying style sheets. The style sheets should be designed
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so that bidi rules are separate from other style rules. The bidi rules
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should not be overridden by other style sheets so that the language's
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bidi behavior is preserved.
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should not be overridden by other style sheets so that the
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document language's or DTD's bidi behavior is preserved.
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<div class="example"><P>
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In this example,
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class="propinst-unicode-bidi">'unicode-bidi'</span> property, it
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specifies an additional embedding level.
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<li> When set for a table element, it specifies the direction of table
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layout.
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<li>When set for a table element, it specifies the direction of table
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column layout. <strong>Note.</strong> The <span
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class="propinst-direction">'direction'</span>, when specified for
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table column elements, is not inherited by cells in the column since
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columns don't exist in the document tree. Thus, CSS cannot easily
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capture the "dir" attribute inheritance rules described in [[HTML40]],
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section 11.3.2.1.
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<li> It specifies the direction that a containing block will grow in
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certain cases of content (i.e. overflow).
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<li> It specifies the direction of horizontal overflow.
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</ol>
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<P>In order to ensure the proper application of the bidirectional
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algorithm, inline boxes (including anonymous inline boxes) must be
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constructed, split up if necessary, and flowed so that the final order
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of the characters on each line conforms to the Unicode bidirectional
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algorithm. This means that left-to-right flow and right-to-left flow
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can occur within the same element. Non-textual entities such as images
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are treated as neutral characters, unless their <span
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algorithm. This means that left-to-right character sequences and
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right-to-left character sequences can occur within an element's
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content, but inline boxes are constructed so that
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flow remains in one direction. Non-textual entities such as
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images are treated as neutral characters, unless their <span
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class="propinst-unicode-bidi">'unicode-bidi'</span> property has a
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value other than 'normal', in which case they are treated as strong
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characters in the <span class="propinst-direction">'direction'</span>
@@ -1941,11 +1955,7 @@ their bidirectionality must be preserved <em>however they are
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rendered</em>. For example, people expect paragraphs to behave like a
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block with respect to bidirectionality, so even if a paragraph is
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displayed as an 'inline' element, it must introduce a new level of
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bidi embedding. To achieve this, all HTML 4.0 ([[HTML40]])
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block elements must behave as though they had a value of 'embed'
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for <span class="propinst-unicode-bidi">'unicode-bidi'</span>,
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whatever the value of the <span
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class="propinst-display">'display'</span> property.
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bidi embedding.
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<P>The following rules capture the remaining bidi semantics
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of HTML 4.0:</p>
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BDO[DIR="ltr"] { direction: ltr; unicode-bidi: bidi-override }
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BDO[DIR="rtl"] { direction: rtl; unicode-bidi: bidi-override }
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*[DIR="ltr"] { direction: ltr; unicode-bidi: embed }
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*[DIR="rtl"] { direction: rtl; unicode-bidi: embed }
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*[DIR="ltr"] { direction: ltr; unicode-bidi: embed }
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*[DIR="rtl"] { direction: rtl; unicode-bidi: embed }
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/* Block-level elements */
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ADDRESS, BLOCKQUOTE, BODY, DD, DIV, DL, DT, FIELDSET,
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FORM, FRAME, FRAMESET, H1, H2, H3, H4, H5, H6, IFRAME,
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NOSCRIPT, NOFRAMES, OBJECT, OL, P, UL, APPLET, CENTER,
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DIR, HR, MENU, PRE, LI, TABLE, TR, THEAD, TBODY, TFOOT,
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COL, COLGROUP, TD, TH, CAPTION
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{ unicode-bidi: embed }
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</PRE>
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</BODY>

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