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[css2] Edits by Tantek. Should be ready now.
--HG-- extra : convert_revision : svn%3A73dc7c4b-06e6-40f3-b4f7-9ed1dbc14bfc/trunk%401875
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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 2.80 2002-04-23 23:29:32 bbos Exp $ -->
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<!-- $Id: visuren.src,v 2.81 2002-04-30 17:51:03 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>Visual formatting model</title>
@@ -636,7 +636,13 @@ href="#containing-block">containing block</a>. The height of a line
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box is determined by the rules given in the section on <a
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href="visudet.html#line-height">line height calculations</a>.
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<p>When several inline boxes cannot fit horizontally within a single
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<p>A line box is always tall enough for all of the boxes it contains.
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However, it may be taller than the tallest box it contains
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(if, for example, boxes are aligned so that baselines line up).
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When the height of a box B is less than the height of the line box containing it,
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the vertical alignment of B within the line box is determined by
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the 'vertical-align' property.
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When several inline boxes cannot fit horizontally within a single
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line box, they are distributed among two or more vertically-stacked
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line boxes. Thus, a paragraph is a vertical stack of line boxes. Line
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boxes are stacked with no vertical separation and they never overlap.
@@ -783,17 +789,8 @@ line breaks and the space originally reserved for it. The section on
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<a href="#containing-block">containing blocks</a> explains when a
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relatively positioned box establishes a new containing block.
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<p>A relatively positioned box is generated when the <span
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class="propinst-position">'position'</span> property for an element
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has the value 'relative'. The offset is specified by the <span
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class="propinst-top">'top'</span>, <span
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class="propinst-bottom">'bottom'</span>, <span
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class="propinst-left">'left'</span>, and <span
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class="propinst-right">'right'</span> properties.
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<p>For relatively positioned elements, 'left' and 'right' move the
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box(es) horizontally, without changing their size. 'Left' moves the
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box(es) horizontally, without changing their size. 'left' moves the
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boxes to the right, and 'right' moves them to the left. Since boxes
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are not split or stretched as a result of 'left' or 'right', the
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computed values are always: left = -right.
@@ -825,8 +822,11 @@ div.a8 { position: relative; direction: ltr; left: -1em; right: 5em }
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</div>
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<p>The 'top' and 'bottom' properties move relatively positioned
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elements up or down. They also must be each other's negative. If both
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are 'auto', their computed values are both '0'. If one of them is
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element(s) up or down without changing their size. 'top' moves the
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boxes down, and 'bottom' moves them up. Since boxes
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are not split or stretched as a result of 'top' or 'bottom', the
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computed values are always: top = -bottom.
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If both are 'auto', their computed values are both '0'. If one of them is
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'auto', it becomes the negative of the other. If neither is 'auto',
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'bottom' is ignored (i.e., the computed value of 'bottom' will be
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minus the value of 'top').
@@ -1247,27 +1247,39 @@ class="propinst-float">'float'</span> -- interact as follows:</p>
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<ol>
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<li>If <span class="propinst-display">'display'</span>
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has the value 'none',
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user agents must <a href="syndata.html#ignore">ignore</a>
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has the value 'none', then
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<span class="propinst-position">'position'</span> and
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<span class="propinst-float">'float'</span>. In this
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case, the element generates no box.
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<span class="propinst-float">'float'</span> do not apply.
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In this case, the element generates no box.
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<li>Otherwise, if <span class="propinst-position">'position'</span>
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has the value 'absolute' or 'fixed', then the computed value of <span
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class="propinst-display">'display'</span> is 'block' and the computed
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value of <span class="propinst-float">'float'</span> is 'none'. The
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position of the box will be determined by the <span
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has the value 'absolute' or 'fixed', the box is absolutely positioned,
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the computed
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value of <span class="propinst-float">'float'</span> is 'none',
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and display is set according to this table:
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<table border="1">
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<tr><th>Specified value <th style="width:30%">Computed value
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<tr><td>inline-table <td>table
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<tr><td>inline, run-in, table-row-group, table-column,
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table-column-group, table-header-group, table-footer-group, table-row,
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table-cell, table-caption, inline-block <td>block
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<tr><td>others <td>same as specified
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</table>
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<p>The position of the box will be determined by the <span
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class="propinst-top">'top'</span>, <span
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class="propinst-right">'right'</span>, <span
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class="propinst-bottom">'bottom'</span> and <span
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class="propinst-left">'left'</span> properties and the box's
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containing block.
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</p>
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</li>
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<li>Otherwise, if 'float' has a value other than 'none', the box is
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floated and 'display' is set according to this table:
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<table>
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<tr><th>Specified value <th>Computed value
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<table border="1">
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<tr><th>Specified value <th style="width:30%">Computed value
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<tr><td>inline-table <td>table
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<tr><td>inline, run-in, table-row-group, table-column,
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table-column-group, table-header-group, table-footer-group, table-row,
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as specified.
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</ol>
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<div class="note"><p>
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<em><strong>Note.</strong> CSS2 does not
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specify layout behavior when values for these properties are changed
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by scripts. For example, what happens when an element having 'width:
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auto' is repositioned? Do the contents reflow, or do they maintain
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their original formatting? The answer is outside the scope of this
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document, and such behavior is likely to differ in initial
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implementations of CSS2.
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</em>
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</div>
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<h2><a name="comparison">Comparison of normal flow, floats,
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and absolute positioning</a></h2>
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<p>To illustrate the differences between normal flow, relative
@@ -1750,28 +1751,15 @@ written with Hebrew letters) to Latin letters at the user's request.
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<p>The HTML 4.0 specification ([HTML40], section 8.2) defines
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bidirectionality behavior for HTML elements. <a
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href="conform.html#conformance">Conforming</a> user agents that
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do not support bidirectional text may
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therefore ignore the <span
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do not support bidirectional text may ignore the <span
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class="propinst-direction">'direction'</span> and <span
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class="propinst-unicode-bidi">'unicode-bidi'</span> properties in
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author and user style sheets if a 'unicode-bidi' or 'direction' value
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conflicts with the HTML 4.0 "dir" attribute value. The style sheet
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author and user style sheets. The style sheet
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rules that would achieve the bidi behavior specified in [[HTML40]] are
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given in <a href="sample.html#bidi">the sample style sheet</a>. The
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HTML 4.0 specification also contains more information on
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bidirectionality issues.
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<div class="note">
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<em><strong>Note.</strong>
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User agents are not required to support the <span
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class="propinst-direction">'direction'</span> and <span
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class="propinst-unicode-bidi">'unicode-bidi'</span> properties
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to <a href="conform.html#conformance">conform</a> to
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CSS2 unless they support bi-directional text rendering
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(except for the case of HTML 4.0 as noted above).
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</em>
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</div>
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<!-- #include src=properties/direction.srb -->
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