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[css-text-3] Hanging/collapsing of fixed-width spaces #4096

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frivoal merged 1 commit into from
Jul 9, 2019
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[css-text-3] Hanging/collapsing of fixed-width spaces #4096

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[css-text-3] Hanging/collapsing of fixed-width spaces 
Closes #3879
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@frivoal
frivoal committed Jul 9, 2019
commit 404ecc36f3de1fd886f813c853f0b3307008bf72
20 changes: 16 additions & 4 deletions css-text-3/Overview.bs
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Expand Up @@ -1049,7 +1049,8 @@ Text Processing</h3>
<h3 id="white-space-rules">
The White Space Processing Rules</h3>

<p>White space processing in CSS affects only
<p>Except where specified otherwise,
White space processing in CSS affects only
the <dfn export lt="white space|white space characters| document white space|document white space characters">document white space characters</dfn>:
spaces (U+0020), tabs (U+0009), and <a href="#white-space-processing">segment breaks</a>.

Expand All @@ -1076,6 +1077,17 @@ Text Processing</h3>
However, since both include spaces (U+0020), tabs (U+0009), and line feeds (U+000A)
most authors won't notice any differences.

<p>Besides
Space (U+0020)
and No-Break Space (U+00A0),
Unicode [[UNICODE]] defines a number of additional space separator characters.
In this specification
all characters in the Unicode Zs category (See [[!UAX44]])
except Space (U+0020)
and No-Break Space (U+00A0)
are collectively referred to as
<dfn>other space separators</dfn>.

<h4 id="white-space-phase-1">Phase I: Collapsing and Transformation</h4>

<p>For each inline (including anonymous inlines;
Expand Down Expand Up @@ -1508,7 +1520,7 @@ Text Processing</h3>
<li>A sequence at the end of a line
(ignoring any intervening <a>inline box</a> boundaries)
of <a>collapsible</a> spaces (U+0020)
and/or ideographic spaces (U+3000) whose 'white-space' value collapses spaces
and/or [=other space separators=] whose 'white-space' value collapses spaces
is removed.

<wpt>
Expand All @@ -1531,7 +1543,7 @@ Text Processing</h3>
white-space-processing-047.xht
</wpt>
<li>If there remains any sequence of <a>white space</a>
and/or ideographic spaces (U+3000)
and/or [=other space separators=]
at the end of a line:
<ul>
<li>If 'white-space' is set to ''pre-wrap'',
Expand Down Expand Up @@ -2179,7 +2191,7 @@ Line Breaking Details</h3>
<code>NU</code>, <code>AL</code>, <code>AI</code>, or <code>ID</code>
Unicode line breaking classes [[!UAX14]]).
It does not affect rules governing the <a>soft wrap opportunities</a>
created by spaces (including U+3000 IDEOGRAPHIC SPACE) and around punctuation.
created by spaces (including [=other space separators=]) and around punctuation.
(See 'line-break' for controls affecting punctuation and small kana.)

<wpt>
Expand Down