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are expected to have alternate glyphs or positioning for typesetting upright in vertical text.
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In the case of <code>Tr</code><adata-link-type=dfnhref=#charactertitle=characters>characters</a>,
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if such vertical alternate glyphs are missing from the font,
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the UA may (but is not required to)
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fall back to <ahref=#typeset-sideways>typesetting them sideways</a>
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in order to synthesize the missing glyphs.
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<pclass=issueid=issue-9f05185d><aclass=self-linkhref=#issue-9f05185d></a>There is an ongoing discussion of whether UAs should be allowed, required, or forbidden from synthesizing vertical alternate glyphs for Tr codepoints.
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the UA <em>may wish to</em><adata-biblio-type=normativedata-link-type=bibliohref=#rfc6919title=rfc6919>[RFC6919]</a> (but is not expected to)
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synthesize the missing glyphs by <ahref=#typeset-sideways>typesetting them sideways</a> etc.
in place of the <adata-link-type=dfnhref=http://dev.w3.org/csswg/css-sizing-3/#availabletitle="available measure">available measure</a> for calculations that
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require a definite <adata-link-type=dfnhref=http://dev.w3.org/csswg/css-sizing-3/#availabletitle="available measure">available measure</a>.
Horizontal-in-Vertical Composition: the <aclass=propertydata-link-type=propdeschref=#propdef-text-combine-horizontaltitle=text-combine-horizontal>text-combine-horizontal</a> property</span><aclass=self-linkhref=#text-combine-horizontal></a></h3>
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<tableclass="definition propdef"><tr><th>Name:<td><dfnclass=css-codedata-dfn-type=propertydata-export="" id=propdef-text-combine-horizontal>text-combine-horizontal<aclass=self-linkhref=#propdef-text-combine-horizontal></a></dfn><tr><th>Value:<td>none | all | [ digits <integer>? ]<tr><th>Initial:<td>none<tr><th>Applies to:<td>non-replaced inline elements<tr><th>Inherited:<td>yes<tr><th>Media:<td>visual<tr><th>Computed value:<td>specified keyword, plus integer if <spanclass=cssdata-link-type=maybetitle=digits>digits</span><tr><th>Canonical order:<td>n/a<tr><th>Percentages:<td>n/a<tr><th>Animatable:<td>no</table>
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<pclass=issueid=issue-394a8f4a><aclass=self-linkhref=#issue-394a8f4a></a>The WG would appreciate a better (more obvious + easier to type) name for this, if anyone can come up with one.
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<pclass=issueid=issue-4cc0bc9e><aclass=self-linkhref=#issue-4cc0bc9e></a>The WG would appreciate a better (more obvious + easier to type) name for this, if anyone can come up with one.
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<p>This property specifies the combination of multiple characters into the space of a single character.
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If the combined text is wider than 1em, the UA must fit the contents within 1em, see below.
<divdata-fill-with=normative-references><dl><dtid=css21title=CSS21><aclass=self-linkhref=#css21></a>[CSS21]<dd>Bert Bos; et al. <ahref=http://www.w3.org/TR/2011/REC-CSS2-20110607>Cascading Style Sheets Level 2 Revision 1 (CSS 2.1) Specification</a>. 7 June 2011. W3C Recommendation. URL: <ahref=http://www.w3.org/TR/2011/REC-CSS2-20110607>http://www.w3.org/TR/2011/REC-CSS2-20110607</a><dtid=css3-sizingtitle=CSS3-SIZING><aclass=self-linkhref=#css3-sizing></a>[CSS3-SIZING]<dd>Tab Atkins Jr.; Elika J. Etemad. <ahref=http://www.w3.org/TR/2012/WD-css3-sizing-20120927/>CSS Intrinsic & Extrinsic Sizing Module Level 3</a>. 27 September 2012. W3C Working Draft. (Work in progress.) URL: <ahref=http://www.w3.org/TR/2012/WD-css3-sizing-20120927/>http://www.w3.org/TR/2012/WD-css3-sizing-20120927/</a><dtid=css3bgtitle=CSS3BG><aclass=self-linkhref=#css3bg></a>[CSS3BG]<dd>Bert Bos; Elika J. Etemad; Brad Kemper. <ahref=http://www.w3.org/TR/2012/CR-css3-background-20120724/>CSS Backgrounds and Borders Module Level 3</a>. 24 July 2012. W3C Candidate Recommendation. (Work in progress.) URL: <ahref=http://www.w3.org/TR/2012/CR-css3-background-20120724/>http://www.w3.org/TR/2012/CR-css3-background-20120724/</a><dtid=css3coltitle=CSS3COL><aclass=self-linkhref=#css3col></a>[CSS3COL]<dd>Håkon Wium Lie. <ahref=http://www.w3.org/TR/2011/CR-css3-multicol-20110412>CSS Multi-column Layout Module</a>. 12 April 2011. W3C Candidate Recommendation. (Work in progress.) URL: <ahref=http://www.w3.org/TR/2011/CR-css3-multicol-20110412>http://www.w3.org/TR/2011/CR-css3-multicol-20110412</a><dtid=css3texttitle=CSS3TEXT><aclass=self-linkhref=#css3text></a>[CSS3TEXT]<dd>Elika J. Etemad; Koji Ishii. <ahref=http://www.w3.org/TR/2012/WD-css3-text-20121113/>CSS Text Module Level 3</a>. 13 November 2012. W3C Working Draft. (Work in progress.) URL: <ahref=http://www.w3.org/TR/2012/WD-css3-text-20121113/>http://www.w3.org/TR/2012/WD-css3-text-20121113/</a><dtid=rfc2119title=RFC2119><aclass=self-linkhref=#rfc2119></a>[RFC2119]<dd>S. Bradner. <ahref=http://www.ietf.org/rfc/rfc2119.txt>Key words for use in RFCs to Indicate Requirement Levels</a>. URL: <ahref=http://www.ietf.org/rfc/rfc2119.txt>http://www.ietf.org/rfc/rfc2119.txt</a><dtid=svg11title=SVG11><aclass=self-linkhref=#svg11></a>[SVG11]<dd>Erik Dahlström; et al. <ahref=http://www.w3.org/TR/2011/REC-SVG11-20110816/>Scalable Vector Graphics (SVG) 1.1 (Second Edition)</a>. 16 August 2011. W3C Recommendation. URL: <ahref=http://www.w3.org/TR/2011/REC-SVG11-20110816/>http://www.w3.org/TR/2011/REC-SVG11-20110816/</a><dtid=uax11title=UAX11><aclass=self-linkhref=#uax11></a>[UAX11]<dd>Asmus Freytag. <ahref=http://www.unicode.org/reports/tr11/>East Asian Width</a>. 17 January 2012. URL: <ahref=http://www.unicode.org/reports/tr11/>http://www.unicode.org/reports/tr11/</a><dtid=uax24title=UAX24><aclass=self-linkhref=#uax24></a>[UAX24]<dd>Mark Davis; Ken Whistler. <ahref=http://www.unicode.org/reports/tr24/>Unicode Script Property</a>. 13 January 2012. URL: <ahref=http://www.unicode.org/reports/tr24/>http://www.unicode.org/reports/tr24/</a><dtid=uax29title=UAX29><aclass=self-linkhref=#uax29></a>[UAX29]<dd>Mark Davis. <ahref=http://www.unicode.org/reports/tr29/>Unicode Text Segmentation</a>. 12 September 2012. URL: <ahref=http://www.unicode.org/reports/tr29/>http://www.unicode.org/reports/tr29/</a><dtid=uax44title=UAX44><aclass=self-linkhref=#uax44></a>[UAX44]<dd>Mark Davis; Ken Whistler. <ahref=http://www.unicode.org/reports/tr44/>Unicode Character Database</a>. 23 January 2012. URL: <ahref=http://www.unicode.org/reports/tr44/>http://www.unicode.org/reports/tr44/</a><dtid=uax9title=UAX9><aclass=self-linkhref=#uax9></a>[UAX9]<dd>Mark Davis. <ahref=http://www.unicode.org/reports/tr9/>Unicode Bidirectional Algorithm</a>. 16 January 2012. URL: <ahref=http://www.unicode.org/reports/tr9/>http://www.unicode.org/reports/tr9/</a><dtid=unicodetitle=UNICODE><aclass=self-linkhref=#unicode></a>[UNICODE]<dd>The Unicode Consortium. <ahref=http://www.unicode.org/standard/versions/enumeratedversions.html>The Unicode Standard</a>. 2012. Defined by: The Unicode Standard, Version 6.2.0 (Mountain View, CA: The Unicode Consortium, 2012. ISBN 978-1-936213-07-8), as updated from time to time by the publication of new versions URL: <ahref=http://www.unicode.org/standard/versions/enumeratedversions.html>http://www.unicode.org/standard/versions/enumeratedversions.html</a><dtid=utr50title=UTR50><aclass=self-linkhref=#utr50></a>[UTR50]<dd>Koji Ishii. <ahref=http://www.unicode.org/reports/tr50/>Unicode Properties for Vertical Text Layout</a>. 31 August 2013. URL: <ahref=http://www.unicode.org/reports/tr50/>http://www.unicode.org/reports/tr50/</a></dl></div>
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<divdata-fill-with=normative-references><dl><dtid=css21title=CSS21><aclass=self-linkhref=#css21></a>[CSS21]<dd>Bert Bos; et al. <ahref=http://www.w3.org/TR/2011/REC-CSS2-20110607>Cascading Style Sheets Level 2 Revision 1 (CSS 2.1) Specification</a>. 7 June 2011. W3C Recommendation. URL: <ahref=http://www.w3.org/TR/2011/REC-CSS2-20110607>http://www.w3.org/TR/2011/REC-CSS2-20110607</a><dtid=css3-sizingtitle=CSS3-SIZING><aclass=self-linkhref=#css3-sizing></a>[CSS3-SIZING]<dd>Tab Atkins Jr.; Elika J. Etemad. <ahref=http://www.w3.org/TR/2012/WD-css3-sizing-20120927/>CSS Intrinsic & Extrinsic Sizing Module Level 3</a>. 27 September 2012. W3C Working Draft. (Work in progress.) URL: <ahref=http://www.w3.org/TR/2012/WD-css3-sizing-20120927/>
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http://www.w3.org/TR/2012/WD-css3-sizing-20120927/</a><dtid=css3bgtitle=CSS3BG><aclass=self-linkhref=#css3bg></a>[CSS3BG]<dd>Bert Bos; Elika J. Etemad; Brad Kemper. <ahref=http://www.w3.org/TR/2012/CR-css3-background-20120724/>CSS Backgrounds and Borders Module Level 3</a>. 24 July 2012. W3C Candidate Recommendation. (Work in progress.) URL: <ahref=http://www.w3.org/TR/2012/CR-css3-background-20120724/>http://www.w3.org/TR/2012/CR-css3-background-20120724/</a><dtid=css3coltitle=CSS3COL><aclass=self-linkhref=#css3col></a>[CSS3COL]<dd>Håkon Wium Lie. <ahref=http://www.w3.org/TR/2011/CR-css3-multicol-20110412>CSS Multi-column Layout Module</a>. 12 April 2011. W3C Candidate Recommendation. (Work in progress.) URL: <ahref=http://www.w3.org/TR/2011/CR-css3-multicol-20110412>http://www.w3.org/TR/2011/CR-css3-multicol-20110412</a><dtid=css3texttitle=CSS3TEXT><aclass=self-linkhref=#css3text></a>[CSS3TEXT]<dd>Elika J. Etemad; Koji Ishii. <ahref=http://www.w3.org/TR/2012/WD-css3-text-20121113/>CSS Text Module Level 3</a>. 13 November 2012. W3C Working Draft. (Work in progress.) URL: <ahref=http://www.w3.org/TR/2012/WD-css3-text-20121113/>http://www.w3.org/TR/2012/WD-css3-text-20121113/</a><dtid=rfc2119title=RFC2119><aclass=self-linkhref=#rfc2119></a>[RFC2119]<dd>S. Bradner. <ahref=http://www.ietf.org/rfc/rfc2119.txt>Key words for use in RFCs to Indicate Requirement Levels</a>. URL: <ahref=http://www.ietf.org/rfc/rfc2119.txt>http://www.ietf.org/rfc/rfc2119.txt</a><dtid=rfc6919title=RFC6919><aclass=self-linkhref=#rfc6919></a>[RFC6919]<dd>R. Barnes; S. Kent; E. Rescorla. <ahref=http://www.ietf.org/rfc/rfc6919.txt>Further Key Words for Use in RFCs to Indicate Requirement Levels</a>. April 1 2013. URL: <ahref=http://www.ietf.org/rfc/rfc6919.txt>http://www.ietf.org/rfc/rfc6919.txt</a><dtid=svg11title=SVG11><aclass=self-linkhref=#svg11></a>[SVG11]<dd>Erik Dahlström; et al. <ahref=http://www.w3.org/TR/2011/REC-SVG11-20110816/>Scalable Vector Graphics (SVG) 1.1 (Second Edition)</a>. 16 August 2011. W3C Recommendation. URL: <ahref=http://www.w3.org/TR/2011/REC-SVG11-20110816/>http://www.w3.org/TR/2011/REC-SVG11-20110816/</a><dtid=uax11title=UAX11><aclass=self-linkhref=#uax11></a>[UAX11]<dd>Asmus Freytag. <ahref=http://www.unicode.org/reports/tr11/>East Asian Width</a>. 17 January 2012. URL: <ahref=http://www.unicode.org/reports/tr11/>http://www.unicode.org/reports/tr11/</a><dtid=uax24title=UAX24><aclass=self-linkhref=#uax24></a>[UAX24]<dd>Mark Davis; Ken Whistler. <ahref=http://www.unicode.org/reports/tr24/>Unicode Script Property</a>. 13 January 2012. URL: <ahref=http://www.unicode.org/reports/tr24/>http://www.unicode.org/reports/tr24/</a><dtid=uax29title=UAX29><aclass=self-linkhref=#uax29></a>[UAX29]<dd>Mark Davis. <ahref=http://www.unicode.org/reports/tr29/>Unicode Text Segmentation</a>. 12 September 2012. URL: <ahref=http://www.unicode.org/reports/tr29/>http://www.unicode.org/reports/tr29/</a><dtid=uax44title=UAX44><aclass=self-linkhref=#uax44></a>[UAX44]<dd>Mark Davis; Ken Whistler. <ahref=http://www.unicode.org/reports/tr44/>Unicode Character Database</a>. 23 January 2012. URL: <ahref=http://www.unicode.org/reports/tr44/>http://www.unicode.org/reports/tr44/</a><dtid=uax9title=UAX9><aclass=self-linkhref=#uax9></a>[UAX9]<dd>Mark Davis. <ahref=http://www.unicode.org/reports/tr9/>Unicode Bidirectional Algorithm</a>. 16 January 2012. URL: <ahref=http://www.unicode.org/reports/tr9/>http://www.unicode.org/reports/tr9/</a><dtid=unicodetitle=UNICODE><aclass=self-linkhref=#unicode></a>[UNICODE]<dd>The Unicode Consortium. <ahref=http://www.unicode.org/standard/versions/enumeratedversions.html>The Unicode Standard</a>. 2012. Defined by: The Unicode Standard, Version 6.2.0 (Mountain View, CA: The Unicode Consortium, 2012. ISBN 978-1-936213-07-8), as updated from time to time by the publication of new versions URL: <ahref=http://www.unicode.org/standard/versions/enumeratedversions.html>http://www.unicode.org/standard/versions/enumeratedversions.html</a><dtid=utr50title=UTR50><aclass=self-linkhref=#utr50></a>[UTR50]<dd>Koji Ishii. <ahref=http://www.unicode.org/reports/tr50/>Unicode Properties for Vertical Text Layout</a>. 31 August 2013. URL: <ahref=http://www.unicode.org/reports/tr50/>http://www.unicode.org/reports/tr50/</a></dl></div>
<tr><thscope=row><adata-property="">text-combine-horizontal</a><td>none | all | [ digits <integer>? ]<td>none<td>non-replaced inline elements<td>yes<td>n/a<td>visual<td>no<td>n/a<td>specified keyword, plus integer if digits</table></div>
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<h2class="no-num heading settled" id=issues-index><spanclass=content>Issues Index</span><aclass=self-linkhref=#issues-index></a></h2><divstyle="counter-reset: issue"><divclass=issue>There is an ongoing discussion of whether UAs should be allowed, required, or forbidden from synthesizing vertical alternate glyphs for Tr codepoints.
This section needs careful review for whether it is a) correct and b) sensible.
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<ahref=#issue-afa4af44> ↵ </a></div><divclass=issue>The WG would appreciate a better (more obvious + easier to type) name for this, if anyone can come up with one.
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<ahref=#issue-b7f71b7c> ↵ </a></div><divclass=issue>The WG would appreciate a better (more obvious + easier to type) name for this, if anyone can come up with one.
are expected to have alternate glyphs or positioning for typesetting upright in vertical text.
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In the case of <code>Tr</code><i>characters</i>,
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if such vertical alternate glyphs are missing from the font,
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the UA may (but is not required to)
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fall back to <ahref="#typeset-sideways">typesetting them sideways</a>
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in order to synthesize the missing glyphs.
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<pclass="issue">There is an ongoing discussion of whether UAs should be allowed, required, or forbidden from synthesizing vertical alternate glyphs for Tr codepoints.
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the UA <em>may wish to</em> [[!RFC6919]] (but is not expected to)
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synthesize the missing glyphs by <ahref="#typeset-sideways">typesetting them sideways</a> etc.
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