W3C CSS2 Cascading Style Sheets, level 2 - instructional media + ...

More documents

Recommendations

Info

3.2 Conformance This section defines conformance with the CSS2 specification only. There may be other levels of CSS in the future that may require a user agent to implement a different set of features in order to conform. In general, the following points must be observed by a user agent claiming conformance to this specification: 1. It must support one or more of the CSS2 media types [p. 77] . 2. For each source document, it must attempt to retrieve all associated style sheets that are appropriate for the supported media types. If it cannot retrieve all associated style sheets (for instance, because of network errors), it must display the document using those it can retrieve. 3. It must parse the style sheets according to this specification. In particular, it must recognize all at-rules, blocks, declarations, and selectors (see the grammar of CSS2 [p. 309] ). If a user agent encounters a property that applies for a supported media type, the user agent must parse the value according to the property definition. This means that the user agent must accept all valid values and must ignore declarations with invalid values. User agents must ignore rules that apply to unsupported media types [p. 77] . 4. For each element in a document tree [p. 30] , it must assign a value for every applicable property according to the property’s definition and the rules of cascading and inheritance [p. 69] . 5. If the source document comes with alternate style sheets (such as with the "alternate" keyword in HTML 4.0 [HTML40]), the UA must allow the user to select one from among these style sheets and apply the selected one. Not every user agent must observe every point, however: A user agent that inputs style sheets must respect points 1 - 3. An authoring tool is only required to output valid style sheets [p. 29] A user agent that renders a document with associated style sheets must respect points 1 - 5 and render the document according to the media-specific requirements set forth in this specification. Values [p. 70] may be approximated when required by the user agent. The inability of a user agent to implement part of this specification due to the limitations of a particular device (e.g., a user agent cannot render colors on a monochrome monitor or page) does not imply non-conformance. This specification recommends that a user agent allow the user to specify user style sheets. 3.3 Error conditions In general, this document does not specify error handling behavior for user agents (e.g., how they behave when they cannot find a resource designated by a URI). However, user agents must observe the rules for handling parsing errors [p. 42] . 32
Since user agents may vary in how they handle error conditions, authors and users must not rely on specific error recovery behavior. 3.4 The text/css content type CSS style sheets that exist in separate files are sent over the Internet as a sequence of bytes accompanied by encoding information (see [HTML40], chapter 5). The structure of the transmission, termed a message entity, is defined by RFC 2045 and RFC 2068 (see [RFC2045] and [RFC2068]). A message entity with a content type of "text/css" represents an independent CSS document. The "text/css" content type has been registered by RFC 2138 ([RFC2318]). 33
Page 1 and 2: REC-CSS2-19980512 Cascading Style S
Page 3 and 4: Quick Table of Contents 1 About the
Page 5 and 6: 4.3.4 URL + URN = URI . . . . . . .
Page 7 and 8: 9.7 Relationships between ’displa
Page 9 and 10: cursive . . . . . . . . . . . . . 2
Page 11: B.1 New functionality . . . . . . .
Page 14 and 15: Section 2: An introduction to CSS2
Page 16 and 17: Initial This part specifies the pro
Page 18 and 19: The section on Paged Media was in l
Page 21 and 22: Contents 2 Introduction to CSS2 2.1
Page 23 and 24: CSS2 has more than 100 different pr
Page 25 and 26: Adding more rules to the style shee
Page 27: Simplicity. CSS2 is more complex th
Page 30 and 31: Document language The encoding lang
Page 35 and 36: Contents 4 CSS2 syntax and basic da
Page 37 and 38: Macro Definition ident name nmstart
Page 39 and 40: In fact, these two methods may be c
Page 41 and 42: P[example="public class foo\ {\ pri
Page 43 and 44: A user agent conforming to a future
Page 45 and 46: 0.28 mm 1.4 mm viewer 28 inch 71 cm
Page 47 and 48: Example(s): An example without quot
Page 49 and 50: Values outside the device gamut sho
Page 51 and 52: When a style sheet resides in a sep
Page 53 and 54: Contents 5 Selectors 5.1 Pattern ma
Page 55 and 56: 5.2 Selector syntax A simple select
Page 57 and 58: 5.6 Child selectors A child selecto
Page 59 and 60: Example(s): The following rule hide
Page 61 and 62: H1#chapter1 { text-align: center }
Page 63 and 64: Example(s): The following rule sets
Page 65 and 66: 5.11.4 The language pseudo-class: :
Page 67 and 68: The following CSS2 will make a drop
Page 69 and 70: 6 Assigning property values, Cascad
Page 71 and 72: BODY { font-size: 10pt } H1 { font-
Page 73 and 74: 6.4.1 Cascading order To find the v
Page 75: author style sheet and may be overr
Page 78 and 79: Link to a target medium The bo
Page 80 and 81: Relationship between media groups a
Page 82 and 83:
Top TM TB TP Margin (Transparent) B
Page 84 and 85:
First element of list Second elemen
Page 86 and 87:
Value: {1,4} | inherit Initial: not
Page 88 and 89:
values, they apply to the top, righ
Page 90 and 91:
’border-color’ Value: {1,4} | t
Page 92 and 93:
Since the initial value of the bord
Page 95 and 96:
Contents 9 Visual formatting model
Page 97 and 98:
9.2 Controlling box generation The
Page 99 and 100:
The P generates a block box, with s
Page 101 and 102:
The properties of the run-in elemen
Page 103 and 104:
Value: static | relative | absolute
Page 105 and 106:
The offset is a fixed distance from
Page 107 and 108:
or like this: Several emphasized wo
Page 109 and 110:
IMG { float: left } BODY, P, IMG {
Page 111 and 112:
image margin paragraph border parag
Page 113 and 114:
Values have the following meanings
Page 115 and 116:
position: fixed; width: 100%; heigh
Page 117 and 118:
Document Window (0,0) (0, 400) 1 Be
Page 119 and 120:
Document Window (0,0) (0, 400) 24 p
Page 121 and 122:
Page 123 and 124:
Page 125 and 126:
Document Window I used two red hyph
Page 127 and 128:
This text will be beneath everythi
Page 129 and 130:
(U+202C) at the end of the element.
Page 131 and 132:
Contents 10 Visual formatting model
Page 133 and 134:
#div1 { position: absolute; left: 5
Page 135 and 136:
(If the border style is ’none’,
Page 137 and 138:
’max-width’ Value: Initial: App
Page 139 and 140:
10.6.1 Inline, non-replaced element
Page 141 and 142:
Value: Initial: Applies to: | | n
Page 143 and 144:
. We recommend a computed value for
Page 145 and 146:
Contents 11 Visual effects 11.1 Ove
Page 147 and 148:
DIV I didn’t like the play, but t
Page 149 and 150:
(0, 0) (50, 0) clip region (0, 55)
Page 151 and 152:
onclick=’show("container2");hid
Page 153 and 154:
12 Generated content, automatic num
Page 155 and 156:
the pseudo-element will behave as i
Page 157 and 158:
’block’: the pseudo-element is
Page 159 and 160:
Approximate rendering ISO 10646 cod
Page 161 and 162:
Value: [ ? ]+ | none | inherit Ini
Page 163 and 164:
Example(s): The following style she
Page 165 and 166:
first or last line box exists in a
Page 167 and 168:
This is a very short document. This
Page 169 and 170:
decimal Decimal numbers, beginning
Page 171 and 172:
inside The marker box is the first
Page 173 and 174:
OL.alpha { list-style: lower-alpha
Page 175 and 176:
Contents 13 Paged media 13.1 Introd
Page 177 and 178:
Sheet Page box A D Page content B C
Page 179 and 180:
13.2.3 Crop marks: the ’marks’
Page 181 and 182:
13.3.1 Break before/after elements:
Page 183 and 184:
Value: | inherit Initial: 2 Applie
Page 185 and 186:
13.4 Cascading in the page context
Page 187 and 188:
Contents 14 Colors and Backgrounds
Page 189 and 190:
This property sets the background i
Page 191 and 192:
User agents may treat ’fixed’ a
Page 193 and 194:
14.3 Gamma correction For informati
Page 195 and 196:
Contents 15 Fonts 15.1 Introduction
Page 197 and 198:
In the CSS2 font model, as in CSS1,
Page 199 and 200:
15.2.2 Font family: the ’font-fam
Page 201 and 202:
normal font. italic Specifies a fon
Page 203 and 204:
1. ultra-condensed 2. extra-condens
Page 205 and 206:
Specifies the aspect value. The num
Page 207 and 208:
15.2.5 Shorthand font property: the
Page 209 and 210:
menu The font used in menus (e.g.,
Page 211 and 212:
Latin fonts Greek fonts Cyrillic fo
Page 213 and 214:
page can be displayed. Progressive
Page 215 and 216:
15.3.2 Descriptors for Selecting a
Page 217 and 218:
15.3.3 Descriptors for Font Data Qu
Page 219 and 220:
Value: [ [format( [, ]*)] | ] [,
Page 221 and 222:
’stemv’ (Descriptor) Value: In
Page 223 and 224:
the extras are ignored. [p. 42] Exa
Page 225 and 226:
Swiss 721 light Swiss 721 Swiss 721
Page 227 and 228:
The ideal solution would be to have
Page 229 and 230:
15.4.11 Lower Baseline This gives t
Page 231 and 232:
15.4.19 Vertical stem width This is
Page 233 and 234:
The per-descriptor matching rules f
Page 235 and 236:
The next example defines a family o
Page 237 and 238:
Contents 16 Text 16.1 Indentation:
Page 239 and 240:
16.3.1 Underlining, overlining, str
Page 241 and 242:
Example(s): Consider this example:
Page 243 and 244:
This property controls capitalizati
Page 245 and 246:
Contents 17 Tables 17.1 Introductio
Page 247 and 248:
other document languages (such as X
Page 249 and 250:
’table-footer-group’) element T
Page 251 and 252:
caption’s margin caption caption
Page 253 and 254:
current margins text text text prev
Page 255 and 256:
cells rows row groups columns colum
Page 257 and 258:
The two algorithms are described be
Page 259 and 260:
percentage values of ’height’ r
Page 262 and 263:
The lengths specify the distance th
Page 264 and 265:
order−width padding padding borde
Page 266 and 267:
An example of a table with collapse
Page 268 and 269:
Each document language may have dif
Page 270 and 271:
270
Page 272 and 273:
help Help is available for the obje
Page 274 and 275:
18.3 User preferences for fonts As
Page 276 and 277:
Example(s): For example, to draw a
Page 278 and 279:
spatial audio), and paragraphs of c
Page 280 and 281:
Value: | | inherit Initial: depen
Page 282 and 283:
Example(s): The following two rules
Page 284 and 285:
far-right Same as ’60deg’. With
Page 286 and 287:
fast Same as 300 words per minute.
Page 288 and 289:
Values have the following meanings:
Page 290 and 291:
290
Page 292 and 293:
SUB { vertical-align: sub } SUP { v
Page 294 and 295:
Dynamic outlines [p. 274] . B.2 Upd
Page 296 and 297:
the native font format on the Amiga
Page 298 and 299:
TrueDoc TrueDoc technology was deve
Page 300 and 301:
Square Cove (4) Obtuse Square Cove
Page 302 and 303:
XHeight Standard/Serifed (4) High/T
Page 304 and 305:
Block Add Block name Unicode range
Page 306 and 307:
This table suggests where such info
Page 308 and 309:
308
Page 310 and 311:
pseudo_page : ’:’ IDENT ; font_
Page 312 and 313:
{num}rad {num}grad {num}ms {num}s {
Page 314 and 315:
[RFC1808] "Relative Uniform Resourc
Page 316 and 317:
[RFC1630] "Universal Resource Ident
Page 318 and 319:
Name ’border-top-width’ [p. 88]
Page 320 and 321:
Name ’list-style-type’ [p. 168]
Page 322 and 323:
Name ’speech-rate’ [p. 285] Val
Page 324 and 325:
Name Values Initial value ’mathli
Page 326 and 327:
’ascent’ (descriptor), 222 aspe
Page 328 and 329:
close-quote, 159, 155 collapsing ma
Page 330 and 331:
font family, 198 font set, 199 font
Page 332 and 333:
definition of, 43 ’letter-spacing
Page 334 and 335:
page model, 175 page selector, 176
Page 336 and 337:
simple selector, 55 ’size’, 177
Page 338:
valid style sheet, 29 value, 41 ver
show all

W3C CSS2 Cascading Style Sheets, level 2 - instructional media + ...

Create successful ePaper yourself

Delete template?

Save as template?