changeset
[css3-values] Viewport-percentage lengths are only based on the first page.
Sun, 24 Feb 2013 01:52:32 +0100
- author
- Simon Sapin <simon.sapin@exyr.org>
- date
- Sun, 24 Feb 2013 01:52:32 +0100
- changeset 7559
- 1190b94caf9e
- parent 7558
- 33f961bea4f4
- child 7560
- ee2ff2976a1a
[css3-values] Viewport-percentage lengths are only based on the first page.
Working Group resolution:
http://lists.w3.org/Archives/Public/www-style/2012Nov/0489.html
| css3-values/Overview.html | file | annotate | diff | comparison | revisions | |
| css3-values/Overview.src.html | file | annotate | diff | comparison | revisions |
1.1 --- a/css3-values/Overview.html Sun Feb 24 01:31:32 2013 +0100 1.2 +++ b/css3-values/Overview.html Sun Feb 24 01:52:32 2013 +0100 1.3 @@ -11,7 +11,7 @@ 1.4 rel=dcterms.rights> 1.5 <meta content="CSS Values and Units Module Level 3" name=dcterms.title> 1.6 <meta content=text name=dcterms.type> 1.7 - <meta content=2013-02-15 name=dcterms.issued> 1.8 + <meta content=2013-02-24 name=dcterms.issued> 1.9 <meta content="http://dev.w3.org/csswg/css3-values/" name=dcterms.creator> 1.10 <meta content=W3C name=dcterms.publisher> 1.11 <meta content="http://dev.w3.org/csswg/css3-values/" 1.12 @@ -39,7 +39,7 @@ 1.13 1.14 <h1>CSS Values and Units Module Level 3</h1> 1.15 1.16 - <h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 15 February 1.17 + <h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 24 February 1.18 2013</h2> 1.19 1.20 <dl> 1.21 @@ -1034,9 +1034,10 @@ 1.22 class=css>vh</code></a>’. 1.23 </dl> 1.24 1.25 - <p class=note>Note that Paged Media defines how the initial containing 1.26 - block transforms across varying page widths. This also affects these 1.27 - units. 1.28 + <p class=note>Note that Paged Media <a href="#CSS3PAGE" 1.29 + rel=biblioentry>[CSS3PAGE]<!--{{CSS3PAGE}}--></a> defines how the initial 1.30 + containing block is only based on the first page, even if subsequent pages 1.31 + have a different size. 1.32 1.33 <h3 id=absolute-lengths><span class=secno>5.2. </span> Absolute lengths: 1.34 the ‘<code class=css>cm</code>’, ‘<code class=css>mm</code>’, 1.35 @@ -1132,7 +1133,7 @@ 1.36 1.37 <div class=figure> 1.38 <p><img 1.39 - alt="This diagram illustrates how the definition of a pixel depends on the users distance from the viewing surface (paper or screen). The image depicts the user looking at two planes, one 28 inches (71 cm) from the user, the second 140 inches (3.5 m) from the user. An expanding cone is projected from the user's eye onto each plane. Where the cone strikes the first plane, the projected pixel is 0.26 mm high. Where the cone strikes the second plane, the projected pixel is 1.4 mm high." 1.40 + alt="This diagram illustrates how the definition of a pixel depends on the users distance from the viewing surface (paper or screen). The image depicts the user looking at two planes, one 28 inches (71 cm) from the user, the second 140 inches (3.5 m) from the user. An expanding cone is projected from the user's eye onto each plane. Where the cone strikes the first plane, the projected pixel is 0.26 mm high. Where the cone strikes the second plane, the projected pixel is 1.4 mm high." 1.41 src=pixel1.png> 1.42 1.43 <p class=caption>Showing that pixels must become larger if the viewing 1.44 @@ -1422,9 +1423,9 @@ 1.45 1.46 <pre> 1.47 .foo { 1.48 - background-image: linear-gradient(to right, silver, 1.49 - white 50px, 1.50 - white calc(100% - 50px), 1.51 + background-image: linear-gradient(to right, silver, 1.52 + white 50px, 1.53 + white calc(100% - 50px), 1.54 silver); 1.55 } 1.56 </pre> 1.57 @@ -1562,7 +1563,7 @@ 1.58 class=css>calc()</code></a>’ expression can be represented as either a 1.59 number or a tuple of a dimension and a percentage. 1.60 <!-- http://lists.w3.org/Archives/Public/www-style/2010May/0001.html 1.61 - This has notes on how we should handle things when calc() is extended to 1.62 + This has notes on how we should handle things when calc() is extended to 1.63 handle unit mult/div. Related to this is <unit>mod<unit>, which can return 1.64 0 and thus introduce computed-time division-by-zero. --> 1.65 1.66 @@ -1945,11 +1946,11 @@ 1.67 <pre> 1.68 content: attr(title color); /* 'content' doesn't accept colors */ 1.69 1.70 -content: attr(end-of-quote string, inherit) close-quote; 1.71 +content: attr(end-of-quote string, inherit) close-quote; 1.72 /* the 'inherit' value is not allowed there, since the result would be 1.73 'inherit close-quote', which is invalid. */ 1.74 1.75 -margin: attr(vertical length) attr(horizontal deg); 1.76 +margin: attr(vertical length) attr(horizontal deg); 1.77 /* deg units are not valid at that point */ 1.78 1.79 color: attr(color); /* 'color' doesn't accept strings */</pre> 1.80 @@ -2355,6 +2356,16 @@ 1.81 </dd> 1.82 <!----> 1.83 1.84 + <dt id=CSS3PAGE>[CSS3PAGE] 1.85 + 1.86 + <dd>Håkon Wium Lie; Melinda Grant. <a 1.87 + href="http://www.w3.org/TR/2006/WD-css3-page-20061010"><cite>CSS3 Module: 1.88 + Paged Media.</cite></a> 10 October 2006. W3C Working Draft. (Work in 1.89 + progress.) URL: <a 1.90 + href="http://www.w3.org/TR/2006/WD-css3-page-20061010">http://www.w3.org/TR/2006/WD-css3-page-20061010</a> 1.91 + </dd> 1.92 + <!----> 1.93 + 1.94 <dt id=MEDIAQ>[MEDIAQ] 1.95 1.96 <dd>Florian Rivoal. <a
2.1 --- a/css3-values/Overview.src.html Sun Feb 24 01:31:32 2013 +0100 2.2 +++ b/css3-values/Overview.src.html Sun Feb 24 01:52:32 2013 +0100 2.3 @@ -175,9 +175,9 @@ 2.4 all of which must occur, in any order. 2.5 <li>A double bar (||) separates two or more options: 2.6 one or more of them must occur, in any order. 2.7 - <li>A bar (|) separates two or more alternatives: 2.8 + <li>A bar (|) separates two or more alternatives: 2.9 exactly one of them must occur. 2.10 - <li>Brackets ([ ]) are for grouping. 2.11 + <li>Brackets ([ ]) are for grouping. 2.12 </ul> 2.13 2.14 <p>Juxtaposition is stronger than the double ampersand, the double 2.15 @@ -311,7 +311,7 @@ 2.16 <p>For example, here is the value definition for the 'border-collapse' 2.17 property:</p> 2.18 <pre>Value: collapse | separate</pre> 2.19 - 2.20 + 2.21 <p>And here is an example of its use:</p> 2.22 <pre>table { border-collapse: separate }</pre> 2.23 </div> 2.24 @@ -399,7 +399,7 @@ 2.25 so that the resulting value is a valid <code>URL</code> token, 2.26 e.g. ''url(open\(parens)'', ''url(close\)parens)''. 2.27 Depending on the type of URL, it might also be possible to write these 2.28 - characters as URI-escapes (e.g. ''url(open%28parens)'' or 2.29 + characters as URI-escapes (e.g. ''url(open%28parens)'' or 2.30 ''url(close%29parens)'') as described in [[URI]]. 2.31 Alternatively a URL containing such characters may be represented as 2.32 a quoted <a href="#strings">string</a> within the ''url()'' notation. 2.33 @@ -412,7 +412,7 @@ 2.34 of the style sheet, not that of the source document. 2.35 2.36 <p>When a <i><url></i> appears in the computed value of a property, 2.37 - it is resolved to an absolute URL, as described in the preceding 2.38 + it is resolved to an absolute URL, as described in the preceding 2.39 paragraph. 2.40 The computed value of a URI that the UA cannot resolve to an absolute 2.41 URI is the specified value.</p> 2.42 @@ -460,7 +460,7 @@ 2.43 2.44 <h3 id="numbers"> 2.45 Numbers: the ''<number>'' type</h3> 2.46 - 2.47 + 2.48 <p>Number values are denoted by 2.49 <dfn id="number-value"><var><number></var></dfn>. 2.50 A <dfn>number</dfn> is either an <integer> or 2.51 @@ -474,7 +474,7 @@ 2.52 Percentages: the ''<percentage>'' type</h3> 2.53 2.54 <p>A <dfn>percentage</dfn> value is denoted by 2.55 - <dfn id="percentage-value"><var><percentage></var></dfn>, 2.56 + <dfn id="percentage-value"><var><percentage></var></dfn>, 2.57 consists of a <i><number></i> immediately followed by a percent 2.58 sign ''%''. It corresponds to the <code>PERCENTAGE</code> token in the 2.59 <a href="http://www.w3.org/TR/CSS21/syndata.html#tokenization">grammar</a>. 2.60 @@ -494,9 +494,9 @@ 2.61 2.62 <p>Lengths refer to distance measurements and are denoted by 2.63 <dfn id="length-value"><var><length></var></dfn> in the 2.64 - property definitions. 2.65 + property definitions. 2.66 A length is a <i>dimension</i>. 2.67 - However, for zero lengths the unit identifier is optional 2.68 + However, for zero lengths the unit identifier is optional 2.69 (i.e. can be syntactically represented as the <var><number></var> ''0''). 2.70 2.71 <p>A <dfn>dimension</dfn> is a <i>number</i> immediately followed by a 2.72 @@ -528,7 +528,7 @@ 2.73 units can more easily scale from one output environment to another. 2.74 2.75 <p>The relative units are:</p> 2.76 - 2.77 + 2.78 <table class="data"> 2.79 <caption>Informative Summary of Relative Units</caption> 2.80 <thead> 2.81 @@ -563,8 +563,8 @@ 2.82 <p>Aside from ''rem'' (which refers to the font-size of the root element), 2.83 the font-relative lengths refer to the computed font metrics of the 2.84 element on which they are used. 2.85 - The exception is when they occur in the value of the 'font-size' property 2.86 - itself, in which case they refer to the computed font metrics of the parent element 2.87 + The exception is when they occur in the value of the 'font-size' property 2.88 + itself, in which case they refer to the computed font metrics of the parent element 2.89 (or the computed font metrics corresponding to the initial values of the 'font' 2.90 property, if the element has no parent). 2.91 2.92 @@ -635,8 +635,9 @@ 2.93 <dd>Equal to the larger of ''vw'' or ''vh''. 2.94 </dl> 2.95 2.96 - <p class='note'>Note that Paged Media defines how the initial containing block 2.97 - transforms across varying page widths. This also affects these units.</p> 2.98 + <p class='note'>Note that Paged Media [[CSS3PAGE]] defines how 2.99 + the initial containing block is only based on the first page, 2.100 + even if subsequent pages have a different size.</p> 2.101 2.102 <h3 id="absolute-lengths"> 2.103 Absolute lengths: the ''cm'', ''mm'', ''in'', ''pt'', ''pc'', ''px'' units</h3> 2.104 @@ -686,12 +687,12 @@ 2.105 it is recommended instead that the anchor unit be the pixel unit. For 2.106 such devices it is recommended that the pixel unit refer to the whole 2.107 number of device pixels that best approximates the reference pixel. 2.108 - 2.109 + 2.110 <p class="note">Note that if the anchor unit is the pixel unit, 2.111 the physical units might not match their physical measurements. 2.112 Alternatively if the anchor unit is a physical unit, the pixel 2.113 unit might not map to a whole number of device pixels.</p> 2.114 - 2.115 + 2.116 <p class="note">Note that this definition of the pixel unit and 2.117 the physical units differs from previous versions of CSS. In 2.118 particular, in previous versions of CSS the pixel unit and the 2.119 @@ -708,7 +709,7 @@ 2.120 length of 28 inches, the visual angle is therefore about 0.0213 2.121 degrees. For reading at arm's length, 1px thus corresponds to about 2.122 0.26 mm (1/96 inch). 2.123 - 2.124 + 2.125 <p>The image below illustrates the effect of viewing distance on 2.126 the size of a reference pixel: a reading distance of 71 cm 2.127 (28 inches) results in a reference pixel of 0.26 mm, 2.128 @@ -724,7 +725,7 @@ 2.129 28 inches (71 cm) from the user, the second 140 inches 2.130 (3.5 m) from the user. An expanding cone is projected 2.131 from the user's eye onto each plane. Where the cone 2.132 - strikes the first plane, the projected pixel is 0.26 mm 2.133 + strikes the first plane, the projected pixel is 0.26 mm 2.134 high. Where the cone strikes the second plane, the 2.135 projected pixel is 1.4 mm high."> 2.136 <p class="caption">Showing that pixels must become larger if the 2.137 @@ -764,7 +765,7 @@ 2.138 <dt><dfn title="deg">deg</dfn> 2.139 <dd>Degrees. There are 360 degrees in a full circle. 2.140 <dt><dfn title="grad">grad</dfn> 2.141 - <dd>Gradians, also known as "gons" or "grades". There are 400 gradians 2.142 + <dd>Gradians, also known as "gons" or "grades". There are 400 gradians 2.143 in a full circle. 2.144 <dt><dfn title="rad">rad</dfn> 2.145 <dd>Radians. There are 2π radians in a full circle. 2.146 @@ -795,7 +796,7 @@ 2.147 2.148 <h3 id="frequency"> 2.149 Frequencies: the ''<frequency>'' type and ''Hz'', ''kHz'' units</h3> 2.150 - 2.151 + 2.152 <p>Frequency values are <i>dimensions</i> denoted by 2.153 <dfn id="frequency-value"><frequency></dfn>. 2.154 The frequency unit identifiers are:</p> 2.155 @@ -806,7 +807,7 @@ 2.156 <dt><dfn title="kHz">kHz</dfn> 2.157 <dd>KiloHertz. A kiloHertz is 1000 Hertz. 2.158 </dl> 2.159 - 2.160 + 2.161 <p>For example, when representing sound pitches, 200Hz (or 200hz) 2.162 is a bass sound, and 6kHz (or 6khz) is a treble sound.</p> 2.163 2.164 @@ -822,13 +823,13 @@ 2.165 <dt><dfn>dpcm</dfn></dt> 2.166 <dd>dots per centimeter</dd> 2.167 2.168 - <dt><dfn>dppx</dfn></dt> 2.169 + <dt><dfn>dppx</dfn></dt> 2.170 <dd>dots per ''px'' unit</dd> 2.171 </dl> 2.172 2.173 <p>The <var><resolution></var> unit represents the size of a single "dot" in a 2.174 graphical representation by indicating how many of these dots fit in a 2.175 - CSS 'in', 'cm', or 'px'. 2.176 + CSS 'in', 'cm', or 'px'. 2.177 For uses, see e.g. the ''resolution'' media query in [[MEDIAQ]] 2.178 or the 'image-resolution' property defined in [[CSS3-IMAGES]]. 2.179 2.180 @@ -883,15 +884,15 @@ 2.181 2.182 <p> 2.183 A <dfn>functional notation</dfn> is a type of component value 2.184 - that can represent more complex types or invoke special processing. 2.185 - The syntax starts with the name of the function 2.186 + that can represent more complex types or invoke special processing. 2.187 + The syntax starts with the name of the function 2.188 immediately followed by a left parenthesis 2.189 (i.e. a <code>FUNCTION</code> token) 2.190 - followed by the argument(s) to the notation 2.191 + followed by the argument(s) to the notation 2.192 followed by a right parenthesis. 2.193 White space is allowed, but optional, immediately inside the parentheses. 2.194 - If a function takes a list of arguments, 2.195 - the arguments are separated by a comma (',') 2.196 + If a function takes a list of arguments, 2.197 + the arguments are separated by a comma (',') 2.198 with optional whitespace before and after the comma. 2.199 2.200 <pre class="example"> 2.201 @@ -904,8 +905,8 @@ 2.202 Mathematical Expressions: ''calc()''</h3> 2.203 2.204 <p>The <dfn>calc()</dfn> function 2.205 - allows mathematical expressions with addition (''+''), subtraction (''-''), 2.206 - multiplication (''*''), and division (''/'') to be used 2.207 + allows mathematical expressions with addition (''+''), subtraction (''-''), 2.208 + multiplication (''*''), and division (''/'') to be used 2.209 as component values. The ''calc()'' expression represents the result of the 2.210 mathematical calculation it contains, using standard operator precedence 2.211 rules. It can be used wherever 2.212 @@ -967,9 +968,9 @@ 2.213 2.214 <pre> 2.215 .foo { 2.216 - background-image: linear-gradient(to right, silver, 2.217 - white 50px, 2.218 - white calc(100% - 50px), 2.219 + background-image: linear-gradient(to right, silver, 2.220 + white 50px, 2.221 + white calc(100% - 50px), 2.222 silver); 2.223 } 2.224 </pre> 2.225 @@ -990,12 +991,12 @@ 2.226 attr : "attr(" S* qname [ S+ type-keyword ]? S* [ "," [ unit | calc ] S* ]? ")"; 2.227 unit : [ NUMBER | DIMENSION | PERCENTAGE | "(" S* sum S* ")" | calc | attr ];</pre> 2.228 2.229 - <p class='note'>Note that the grammar requires spaces around binary ''+'' 2.230 - and ''-'' operators. The ''*'' and ''/'' operators do not require 2.231 + <p class='note'>Note that the grammar requires spaces around binary ''+'' 2.232 + and ''-'' operators. The ''*'' and ''/'' operators do not require 2.233 spaces.</p> 2.234 2.235 <p>Additionally, the following redefinition is made to the informative 2.236 - grammar appearing in 2.237 + grammar appearing in 2.238 <a href="http://www.w3.org/TR/CSS2/grammar.html">CSS 2.1 Appendix G</a>:</p> 2.239 2.240 <pre> 2.241 @@ -1007,9 +1008,9 @@ 2.242 ;</pre> 2.243 2.244 <p> 2.245 - UAs must support ''calc()'' expressions of at least 20 terms, 2.246 - where each <code>NUMBER</code>, <code>DIMENSION</code>, or <code>PERCENTAGE</code> is a term. 2.247 - If a ''calc()'' expression contains more than the supported number of terms, 2.248 + UAs must support ''calc()'' expressions of at least 20 terms, 2.249 + where each <code>NUMBER</code>, <code>DIMENSION</code>, or <code>PERCENTAGE</code> is a term. 2.250 + If a ''calc()'' expression contains more than the supported number of terms, 2.251 it must be treated as if it were invalid. 2.252 2.253 2.254 @@ -1018,22 +1019,22 @@ 2.255 2.256 <p> 2.257 A math expression has a <dfn>resolved type</dfn>, which is one of 2.258 - <var><length></var>, 2.259 - <var><frequency></var>, 2.260 - <var><angle></var>, 2.261 + <var><length></var>, 2.262 + <var><frequency></var>, 2.263 + <var><angle></var>, 2.264 <var><time></var>, 2.265 <var><number></var>, or 2.266 - <var><integer></var>. 2.267 - The <i>resolved type</i> must be valid for where the expression is placed; 2.268 - otherwise, the expression is invalid. 2.269 - The <i>resolved type</i> of the expression is determined by the types of the values it contains. 2.270 + <var><integer></var>. 2.271 + The <i>resolved type</i> must be valid for where the expression is placed; 2.272 + otherwise, the expression is invalid. 2.273 + The <i>resolved type</i> of the expression is determined by the types of the values it contains. 2.274 <code>NUMBER</code> tokens are of type <var><number></var> or <var><integer></var>. 2.275 - A <code>DIMENSION</code> token's type is given by its unit 2.276 + A <code>DIMENSION</code> token's type is given by its unit 2.277 (''cm'' is <var><length></var>, ''deg'' is <var><angle></var>, etc.). 2.278 An ''attr()'' expression's type is given by its <var><type-or-unit></var> argument. 2.279 - If percentages are accepted in the context in which the expression is placed, 2.280 - a <code>PERCENTAGE</code> token has the type of the value that percentages are relative to; 2.281 - otherwise, 2.282 + If percentages are accepted in the context in which the expression is placed, 2.283 + a <code>PERCENTAGE</code> token has the type of the value that percentages are relative to; 2.284 + otherwise, 2.285 a math expression containing percentages is invalid.</p> 2.286 2.287 <p>Operators form sub-expressions, which gain types based on their arguments. 2.288 @@ -1045,7 +1046,7 @@ 2.289 2.290 <ul> 2.291 <li> 2.292 - At '','', ''+'', or ''-'', 2.293 + At '','', ''+'', or ''-'', 2.294 check that both sides have the same type, 2.295 or that one side is a <var><number></var> and the other is an <var><integer></var>. 2.296 If both sides are the same type, 2.297 @@ -1054,7 +1055,7 @@ 2.298 resolve to <var><number></var>. 2.299 2.300 <li> 2.301 - At ''*'', 2.302 + At ''*'', 2.303 check that at least one side is <var><number></var>. 2.304 If both sides are <var><integer></var>, 2.305 resolve to <var><integer></var>. 2.306 @@ -1062,7 +1063,7 @@ 2.307 resolve to the type of the other side. 2.308 2.309 <li> 2.310 - At ''/'', 2.311 + At ''/'', 2.312 check that the right side is <var><number></var>. 2.313 If the left side is <var><integer></var>, 2.314 resolve to <var><number></var>. 2.315 @@ -1071,9 +1072,9 @@ 2.316 </ul> 2.317 2.318 <p>If an operator does not pass the above checks, the expression is invalid. 2.319 - Also, division by zero is invalid. This includes both dividing by the 2.320 + Also, division by zero is invalid. This includes both dividing by the 2.321 literal number zero, as well as any numeric expression that evaluates to zero 2.322 - (as purely-numeric expressions can be evaluated without any additional 2.323 + (as purely-numeric expressions can be evaluated without any additional 2.324 information at parse time).</p> 2.325 2.326 <p class='note'> 2.327 @@ -1098,22 +1099,22 @@ 2.328 If there are special rules for computing percentages in a value 2.329 (e.g. <a href="http://www.w3.org/TR/CSS21/visudet.html#the-height-property">the 'height' property</a>), 2.330 they apply whenever a ''calc()'' expression contains percentages. 2.331 - 2.332 + 2.333 <p class='note'> 2.334 Thus, the computed value of a ''calc()'' expression can be represented 2.335 as either a number 2.336 or a tuple of a dimension and a percentage. 2.337 2.338 <!-- http://lists.w3.org/Archives/Public/www-style/2010May/0001.html 2.339 - This has notes on how we should handle things when calc() is extended to 2.340 + This has notes on how we should handle things when calc() is extended to 2.341 handle unit mult/div. Related to this is <unit>mod<unit>, which can return 2.342 0 and thus introduce computed-time division-by-zero. --> 2.343 2.344 <p> 2.345 - Given the complexities of width and height calculations on table cells and table elements, 2.346 - math expressions involving percentages for widths and heights on 2.347 - table columns, table column groups, table rows, table row groups, and table cells 2.348 - in both auto and fixed layout tables 2.349 + Given the complexities of width and height calculations on table cells and table elements, 2.350 + math expressions involving percentages for widths and heights on 2.351 + table columns, table column groups, table rows, table row groups, and table cells 2.352 + in both auto and fixed layout tables 2.353 MAY be treated as if ''auto'' had been specified. 2.354 2.355 2.356 @@ -1121,7 +1122,7 @@ 2.357 Range Checking</h4> 2.358 2.359 <p>The value resulting from an expression must be clamped to the 2.360 - range allowed in the target context. 2.361 + range allowed in the target context. 2.362 2.363 <p class="note">Note this requires all contexts accepting ''calc()'' 2.364 to define their allowable values as a closed (not open) interval. 2.365 @@ -1153,10 +1154,10 @@ 2.366 <pre>toggle( <value><a href="#component-multipliers">#</a> )</pre> 2.367 2.368 <p> 2.369 - where <var><value></var> is any CSS value 2.370 + where <var><value></var> is any CSS value 2.371 that is valid where the expression is placed, 2.372 - and that doesn't contain any top-level commas. 2.373 - If any of the values inside are not valid, 2.374 + and that doesn't contain any top-level commas. 2.375 + If any of the values inside are not valid, 2.376 then the entire ''toggle()'' expression is invalid. 2.377 The ''toggle()'' expression may be used as the value of any property 2.378 (but must be the only component in that property's value). 2.379 @@ -1171,16 +1172,16 @@ 2.380 Declarations containing such constructs are invalid.</p> 2.381 2.382 <p> 2.383 - The value represented by ''toggle()'' is determined 2.384 - by comparing the inherited value <var>I</var> 2.385 - (i.e. the <a href="http://www.w3.org/TR/CSS21/cascade.html#computed-value">computed value</a> on the parent, 2.386 - or, for the root, the initial value) 2.387 + The value represented by ''toggle()'' is determined 2.388 + by comparing the inherited value <var>I</var> 2.389 + (i.e. the <a href="http://www.w3.org/TR/CSS21/cascade.html#computed-value">computed value</a> on the parent, 2.390 + or, for the root, the initial value) 2.391 to the computed values <var>C<sub>n</sub></var> returned by the <var>n</var>-th argument to ''toggle()''. 2.392 - For the earliest <var>C<sub>n</sub></var> 2.393 - such that <var>C<sub>n</sub></var> = <var>I</var>, 2.394 - the value returned by toggle is <var>C<sub>n+1</sub></var>. 2.395 - However, if this <var>C<sub>n</sub></var> is the last value, 2.396 - or if there are no <var>C<sub>n</sub></var> that equal <var>I</var>, 2.397 + For the earliest <var>C<sub>n</sub></var> 2.398 + such that <var>C<sub>n</sub></var> = <var>I</var>, 2.399 + the value returned by toggle is <var>C<sub>n+1</sub></var>. 2.400 + However, if this <var>C<sub>n</sub></var> is the last value, 2.401 + or if there are no <var>C<sub>n</sub></var> that equal <var>I</var>, 2.402 the computed value of the first value is returned instead. 2.403 2.404 <div class='example'> 2.405 @@ -1228,8 +1229,8 @@ 2.406 <p> 2.407 The computed value of the ''attr()'' expression is the value of the attribute with the specified name on the element, according to the rules given below. 2.408 2.409 - <p class='note'>In CSS2.1 [[!CSS21]], the ''attr()'' expression always returns a string. 2.410 - In CSS3, the ''attr()'' expression can return many different types. The 2.411 + <p class='note'>In CSS2.1 [[!CSS21]], the ''attr()'' expression always returns a string. 2.412 + In CSS3, the ''attr()'' expression can return many different types. The 2.413 ''attr()'' expression cannot return everything, for example it cannot 2.414 do counters, named strings, quotes, or keyword values such as ''auto'', 2.415 ''nowrap'', or ''baseline''. This is intentional, as the intent of the 2.416 @@ -1242,14 +1243,14 @@ 2.417 <pre>attr( <attr-name> <type-or-unit>? [ , <fallback> ]? )</pre> 2.418 2.419 <p> 2.420 - where <attr-name> is a <a href="http://dev.w3.org/csswg/css3-namespace/#css-qnames">CSS qualified name</a> 2.421 + where <attr-name> is a <a href="http://dev.w3.org/csswg/css3-namespace/#css-qnames">CSS qualified name</a> 2.422 (the qname production in [[!CSS3NAMESPACE]]) 2.423 that represents an attribute name. 2.424 (In the absence of namespacing, this will just be a CSS identifier.) 2.425 2.426 <p> 2.427 The optional <var><type-or-unit></var> argument is a keyword drawn from the list below that tells the UA how to interpret the attribute value, 2.428 - and defines a type for the attr() expression. 2.429 + and defines a type for the attr() expression. 2.430 If omitted, ''string'' is implied. 2.431 2.432 <p> 2.433 @@ -1287,8 +1288,8 @@ 2.434 <div class='note'> 2.435 <p> 2.436 Note that the default value need not be of the type given, 2.437 - if the attr() expression is the entire property value. 2.438 - For instance, if the type required of the attribute by the author is ''px'', 2.439 + if the attr() expression is the entire property value. 2.440 + For instance, if the type required of the attribute by the author is ''px'', 2.441 the default could still be ''auto'', 2.442 like in ''width: attr(size px, auto);''. 2.443 2.444 @@ -1301,12 +1302,12 @@ 2.445 </div> 2.446 2.447 <p> 2.448 - If the specified attribute exists on the element, 2.449 + If the specified attribute exists on the element, 2.450 the value of the attribute must be parsed as required by the <var><type-or-unit></var> argument 2.451 (as defined in the list below). 2.452 Unless the type is ''string'', it must first be stripped of leading and trailing white space. 2.453 The resulting value is the attr() expression's value. 2.454 - If the value did not parse as required, 2.455 + If the value did not parse as required, 2.456 the attr() expression's value is its fallback value. 2.457 2.458 <p>The <var><type-or-unit></var> keywords are:</p> 2.459 @@ -1314,7 +1315,7 @@ 2.460 <dl> 2.461 <dt>''string'' 2.462 <dd> 2.463 - The attribute value will be parsed as the contents of a CSS <var><string></var>. 2.464 + The attribute value will be parsed as the contents of a CSS <var><string></var>. 2.465 The default is the empty string. 2.466 2.467 <dt>''color'' 2.468 @@ -1325,32 +1326,32 @@ 2.469 2.470 <dt>''url'' 2.471 <dd> 2.472 - The attribute value will be parsed as the contents of a CSS <var><string></var>. 2.473 + The attribute value will be parsed as the contents of a CSS <var><string></var>. 2.474 It is interpreted as a quoted string within the ''url()'' notation. 2.475 The default is ''about:invalid'', which is a URI defined (<a href="#about-invalid">in Appendix A</a>) to point 2.476 - to a non-existent document with a generic error condition. 2.477 + to a non-existent document with a generic error condition. 2.478 Relative URLs must be made absolute 2.479 - according to the rules of the document language as applied to URLs originating from the element; 2.480 + according to the rules of the document language as applied to URLs originating from the element; 2.481 they are not relative to the style sheet. 2.482 2.483 <dt>''integer'' 2.484 <dd> 2.485 The attribute value must parse as a NUMBER CSS token, 2.486 and be successfully interpreted as an <var><integer></var>. 2.487 - The default is ''0'', 2.488 - or else the property's minimum value if ''0'' is not valid for the property. 2.489 - The default must also be used 2.490 - if the property in question only accepts integers within a certain range 2.491 + The default is ''0'', 2.492 + or else the property's minimum value if ''0'' is not valid for the property. 2.493 + The default must also be used 2.494 + if the property in question only accepts integers within a certain range 2.495 and the attribute is out of range. 2.496 2.497 <dt>''number'' 2.498 <dd> 2.499 The attribute value must parse as a NUMBER CSS token, 2.500 and is interpreted as an <var><number></var>. 2.501 - The default is ''0'', 2.502 - or else the property's minimum value if ''0'' is not valid for the property. 2.503 - The default must also be used 2.504 - if the property in question only accepts integers within a certain range 2.505 + The default is ''0'', 2.506 + or else the property's minimum value if ''0'' is not valid for the property. 2.507 + The default must also be used 2.508 + if the property in question only accepts integers within a certain range 2.509 and the attribute is out of range. 2.510 2.511 <dt>''length'' 2.512 @@ -1360,12 +1361,12 @@ 2.513 <dd> 2.514 The attribute value must parse as a DIMENSION CSS token, 2.515 and be successfully interpreted as the specified type. 2.516 - The default is ''0'' in the relevant units, 2.517 - or else the property's minimum value if ''0'' in the relevant units is not valid for the property. 2.518 - The default must also be used 2.519 - if the property in question only accepts values within a certain range 2.520 - (e.g. positive lengths or angles from 0 to 90deg) 2.521 - and the attribute is out of range (e.g. a negative length or 180deg). 2.522 + The default is ''0'' in the relevant units, 2.523 + or else the property's minimum value if ''0'' in the relevant units is not valid for the property. 2.524 + The default must also be used 2.525 + if the property in question only accepts values within a certain range 2.526 + (e.g. positive lengths or angles from 0 to 90deg) 2.527 + and the attribute is out of range (e.g. a negative length or 180deg). 2.528 If the unit is a relative length, it must be computed to an absolute length. 2.529 2.530 <dt>''em'' 2.531 @@ -1392,18 +1393,18 @@ 2.532 <dd> 2.533 The attribute value must parse as a NUMBER CSS token, 2.534 and is interpreted as a <i>dimension</i> with the specified unit. 2.535 - The default is ''0'' in the relevant units, 2.536 - or else the property's minimum value if ''0'' in the relevant units is not valid for the property. 2.537 - The default must also be used 2.538 - if the property in question only accepts values within a certain range 2.539 - (e.g. positive lengths or angles from 0 to 90deg) 2.540 - and the attribute is out of range (e.g. a negative length or 180deg). 2.541 - If the unit is a relative length, 2.542 + The default is ''0'' in the relevant units, 2.543 + or else the property's minimum value if ''0'' in the relevant units is not valid for the property. 2.544 + The default must also be used 2.545 + if the property in question only accepts values within a certain range 2.546 + (e.g. positive lengths or angles from 0 to 90deg) 2.547 + and the attribute is out of range (e.g. a negative length or 180deg). 2.548 + If the unit is a relative length, 2.549 it must be computed to an absolute length. 2.550 </dl> 2.551 2.552 <div class="example"> 2.553 - <p>This example shows the use of attr() to visually illustrate data 2.554 + <p>This example shows the use of attr() to visually illustrate data 2.555 in an XML file:</p> 2.556 2.557 <pre> 2.558 @@ -1443,24 +1444,24 @@ 2.559 }--> 2.560 2.561 <div class="illegal example"> 2.562 - <p>All of the following examples are invalid and would cause a 2.563 - parse-time error, and thus cause the relevant declaration—in 2.564 + <p>All of the following examples are invalid and would cause a 2.565 + parse-time error, and thus cause the relevant declaration—in 2.566 this case all of them—to be ignored:</p> 2.567 2.568 <pre> 2.569 content: attr(title color); /* 'content' doesn't accept colors */ 2.570 2.571 -content: attr(end-of-quote string, inherit) close-quote; 2.572 +content: attr(end-of-quote string, inherit) close-quote; 2.573 /* the 'inherit' value is not allowed there, since the result would be 2.574 'inherit close-quote', which is invalid. */ 2.575 2.576 -margin: attr(vertical length) attr(horizontal deg); 2.577 +margin: attr(vertical length) attr(horizontal deg); 2.578 /* deg units are not valid at that point */ 2.579 2.580 color: attr(color); /* 'color' doesn't accept strings */</pre> 2.581 </div> 2.582 2.583 - <p class='note'>The ''attr()'' expression cannot currently fall back onto 2.584 + <p class='note'>The ''attr()'' expression cannot currently fall back onto 2.585 another attribute. Future versions of CSS may extend ''attr()'' in this 2.586 direction.</p> 2.587 2.588 @@ -1581,21 +1582,21 @@ 2.589 document are to be interpreted as described in RFC 2119. 2.590 However, for readability, these words do not appear in all uppercase 2.591 letters in this specification. 2.592 - 2.593 + 2.594 <p>All of the text of this specification is normative except sections 2.595 explicitly marked as non-normative, examples, and notes. [[!RFC2119]]</p> 2.596 - 2.597 + 2.598 <p>Examples in this specification are introduced with the words “for example” 2.599 or are set apart from the normative text with <code>class="example"</code>, 2.600 like this: 2.601 - 2.602 + 2.603 <div class="example"> 2.604 <p>This is an example of an informative example.</p> 2.605 </div> 2.606 - 2.607 + 2.608 <p>Informative notes begin with the word “Note” and are set apart from the 2.609 normative text with <code>class="note"</code>, like this: 2.610 - 2.611 + 2.612 <p class="note">Note, this is an informative note.</p> 2.613 2.614 <h3 class="no-num" id="conformance-classes"> 2.615 @@ -1615,12 +1616,12 @@ 2.616 <dd>A <a href="http://www.w3.org/TR/CSS21/conform.html#user-agent">UA</a> 2.617 that writes a style sheet. 2.618 </dl> 2.619 - 2.620 + 2.621 <p>A style sheet is conformant to CSS Values and Units Level 3 2.622 if all of its statements that use syntax defined in this module are valid 2.623 according to the generic CSS grammar and the individual grammars of each 2.624 feature defined in this module. 2.625 - 2.626 + 2.627 <p>A renderer is conformant to CSS Values and Units Level 3 2.628 if, in addition to interpreting the style sheet as defined by the 2.629 appropriate specifications, it supports all the features defined 2.630 @@ -1629,7 +1630,7 @@ 2.631 UA to correctly render a document due to limitations of the device 2.632 does not make the UA non-conformant. (For example, a UA is not 2.633 required to render color on a monochrome monitor.) 2.634 - 2.635 + 2.636 <p>An authoring tool is conformant to CSS Values and Units Level 3 2.637 if it writes style sheets that are syntactically correct according to the 2.638 generic CSS grammar and the individual grammars of each feature in 2.639 @@ -1649,14 +1650,14 @@ 2.640 multi-value property declaration: if any value is considered invalid 2.641 (as unsupported values must be), CSS requires that the entire declaration 2.642 be ignored.</p> 2.643 - 2.644 + 2.645 <h3 class="no-num" id="experimental"> 2.646 Experimental implementations</h3> 2.647 2.648 <p>To avoid clashes with future CSS features, the CSS2.1 specification 2.649 reserves a <a href="http://www.w3.org/TR/CSS21/syndata.html#vendor-keywords">prefixed 2.650 syntax</a> for proprietary and experimental extensions to CSS. 2.651 - 2.652 + 2.653 <p>Prior to a specification reaching the Candidate Recommendation stage 2.654 in the W3C process, all implementations of a CSS feature are considered 2.655 experimental. The CSS Working Group recommends that implementations 2.656 @@ -1664,7 +1665,7 @@ 2.657 W3C Working Drafts. This avoids incompatibilities with future changes 2.658 in the draft. 2.659 </p> 2.660 - 2.661 + 2.662 <h3 class="no-num" id="testing"> 2.663 Non-experimental implementations</h3> 2.664 2.665 @@ -1672,7 +1673,7 @@ 2.666 non-experimental implementations are possible, and implementors should 2.667 release an unprefixed implementation of any CR-level feature they 2.668 can demonstrate to be correctly implemented according to spec. 2.669 - 2.670 + 2.671 <p>To establish and maintain the interoperability of CSS across 2.672 implementations, the CSS Working Group requests that non-experimental 2.673 CSS renderers submit an implementation report (and, if necessary, the 2.674 @@ -1680,7 +1681,7 @@ 2.675 releasing an unprefixed implementation of any CSS features. Testcases 2.676 submitted to W3C are subject to review and correction by the CSS 2.677 Working Group. 2.678 - 2.679 + 2.680 <p>Further information on submitting testcases and implementation reports 2.681 can be found from on the CSS Working Group's website at 2.682 <a href="http://www.w3.org/Style/CSS/Test/">http://www.w3.org/Style/CSS/Test/</a>. 2.683 @@ -1698,14 +1699,14 @@ 2.684 products, there is no requirement that all features be implemented by 2.685 a single product. For the purposes of this criterion, we define the 2.686 following terms: 2.687 - 2.688 + 2.689 <dl> 2.690 <dt>independent <dd>each implementation must be developed by a 2.691 different party and cannot share, reuse, or derive from code 2.692 used by another qualifying implementation. Sections of code that 2.693 have no bearing on the implementation of this specification are 2.694 exempt from this requirement. 2.695 - 2.696 + 2.697 <dt>interoperable <dd>passing the respective test case(s) in the 2.698 official CSS test suite, or, if the implementation is not a Web 2.699 browser, an equivalent test. Every relevant test in the test 2.700 @@ -1716,32 +1717,32 @@ 2.701 equivalent tests in the same way for the purpose of 2.702 interoperability. The equivalent tests must be made publicly 2.703 available for the purposes of peer review. 2.704 - 2.705 + 2.706 <dt>implementation <dd>a user agent which: 2.707 - 2.708 + 2.709 <ol class=inline> 2.710 <li>implements the specification. 2.711 - 2.712 + 2.713 <li>is available to the general public. The implementation may 2.714 be a shipping product or other publicly available version 2.715 - (i.e., beta version, preview release, or “nightly build”). 2.716 + (i.e., beta version, preview release, or “nightly build”). 2.717 Non-shipping product releases must have implemented the 2.718 feature(s) for a period of at least one month in order to 2.719 demonstrate stability. 2.720 - 2.721 + 2.722 <li>is not experimental (i.e., a version specifically designed 2.723 to pass the test suite and is not intended for normal usage 2.724 going forward). 2.725 </ol> 2.726 </dl> 2.727 - 2.728 + 2.729 <p>The specification will remain Candidate Recommendation for at least 2.730 six months. 2.731 2.732 <h2 class="no-num" id="changes">Changes</h2> 2.733 2.734 <p>Changes since the <a href="http://www.w3.org/TR/2012/CR-css3-values-20120828/">28 August Candidate Recommendation</a> are: 2.735 - 2.736 + 2.737 <ul> 2.738 <li>Corrected <code>wqname</code> in the ''attr()'' syntax to <code>qname</code> 2.739 <li>Made undefined namespace prefixes in ''attr()'' invalidate the function.
