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Merged
fantasai merged 4 commits into from
Sep 18, 2015
Merged

Florian/pre wrap auto trim #49

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55bc11c
[css-text-4] Bugfix, initial value of text-space-trim is none
frivoal Sep 11, 2015
eb64ff3
[css-text-4] add preserve-auto and preserve-trim, explain the shorthand
frivoal Sep 11, 2015
57b084d
[css-text-4] Mark preserve-trim at risk
frivoal Sep 18, 2015
61897a5
[css-text-4] Say that preserve-auto should follow platform conventions
frivoal Sep 18, 2015
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82 changes: 80 additions & 2 deletions css-text-4/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@ Editor: Koji Ishii, Invited Expert, kojiishi@gluesoft.co.jp
Editor: Alan Stearns, Adobe Systems, stearns@adobe.com
Abstract: This module defines properties for text manipulation and specifies their processing model. It covers line breaking, justification and alignment, white space handling, and text transformation.
Ignored terms: segment break, segment breaks
At Risk: The ''preserve-trim'' of the 'text-space-collapse' property
</pre>

<h2 id="intro">
Expand All @@ -36,7 +37,7 @@ White Space Collapsing: the 'text-space-collapse' property</h3>

<pre class="propdef">
Name: text-space-collapse
Value: collapse | discard | preserve | preserve-breaks | preserve-spaces
Value: collapse | discard | preserve | preserve-auto | preserve-trim | preserve-breaks | preserve-spaces
Initial: collapse
Applies to: all elements
Inherited: yes
Expand Down Expand Up @@ -65,6 +66,37 @@ White Space Collapsing: the 'text-space-collapse' property</h3>
from collapsing sequences of white space.
<a>Segment breaks</a> are preserved as forced line breaks.

<dt><dfn>preserve-auto</dfn>
<dd>
This value preserves white space and <a>segment breaks</a> as for ''preserve''.
However, the UA <em>may</em> visually collapse
the advance widths of preserved white space
that occur at the end of a line.

If 'text-wrap' is ''text-wrap/normal'' or ''text-wrap/balance'',
whether or not there are soft wrap opportunities
in preserved sequences of white space,
and if yes where and under what condition,
is UA defined.

Both with regards to collapsing
and to soft wrap opportunities,
the UA should follow platform conventions.

<dt><dfn>preserve-trim</dfn>
<dd>
This value preserves white space and <a>segment breaks</a> as for ''preserve''.
However, the UA <em>must</em> visually collapse to 0
the advance widths of all preserved white space
that occur at the end of a line.

Note: the ''preserve-trim'' value is at risk.

Issue: The CSSWG would appreciate feedback
on the use cases for this value,
to evaluate whether trimming leading spaces
could be needed as well.

<dt><dfn>preserve-breaks</dfn>
<dd>
This value collapses white space as for ''collapse'', but preserves
Expand Down Expand Up @@ -109,7 +141,7 @@ White Space Trimming: the 'text-space-trim' property</h3>
<pre class="propdef">
Name: text-space-trim
Value: none | trim-inner || discard-before || discard-after
Initial: collapse
Initial: none
Applies to: all elements
Inherited: no
Percentages: n/a
Expand Down Expand Up @@ -450,6 +482,52 @@ Shorthand for White Space and Wrapping: the 'white-space' property</h2>
Note: This shorthand combines both inheritable and non-inheritable properties.
If this is a problem, please inform the CSSWG.

The following table gives the mapping of the values of the shorthand to its longhands.

<table class="data">
<colgroup class="header"></colgroup>
<colgroup span=3></colgroup>
<thead>
<tr>
<th>'white-space'
<th>'text-space-collapse'
<th>'text-wrap'
<th>'text-space-trim'
</thead>
<tbody>
<tr>
<th>''white-space/normal''
<td>''text-space-collapse/collapse''
<td>''text-wrap/normal''
<td>''text-space-trim/none''
<tr>
<th>''pre''
<td>''text-space-collapse/preserve''
<td>''text-wrap/nowrap''
<td>''text-space-trim/none''
<tr>
<th>''nowrap''
<td>''text-space-collapse/collapse''
<td>''text-wrap/nowrap''
<td>''text-space-trim/none''
<tr>
<th>''pre-wrap''
<td>''text-space-collapse/preserve''
<td>''text-wrap/normal''
<td>''text-space-trim/none''
<tr>
<th>''pre-wrap-auto''
<td>''text-space-collapse/preserve-auto''
<td>''text-wrap/normal''
<td>''text-space-trim/none''
<tr>
<th>''pre-line''
<td>''text-space-collapse/preserve-breaks''
<td>''text-wrap/normal''
<td>''text-space-trim/none''
</tbody>
</table>

Issue: Add details from level 3

<h2 id="hyphenation">
Expand Down