Cascading Style Sheets, Level 2 - World Wide Web Consortium

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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
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Top TM TB TP Margin (Transparent) B
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First element of list Second elemen
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Value: {1,4} | inherit Initial: not
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values, they apply to the top, righ
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’border-color’ Value: {1,4} | t
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Since the initial value of the bord
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Contents 9 Visual formatting model
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9.2 Controlling box generation The
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The P generates a block box, with s
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The properties of the run-in elemen
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Value: static | relative | absolute
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The offset is a fixed distance from
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or like this: Several emphasized wo
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IMG { float: left } BODY, P, IMG {
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image margin paragraph border parag
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Values have the following meanings
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position: fixed; width: 100%; heigh
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Document Window (0,0) (0, 400) 1 Be
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Document Window (0,0) (0, 400) 24 p
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Document Window I used two red hyph
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This text will be beneath everythi
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(U+202C) at the end of the element.
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Contents 10 Visual formatting model
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#div1 { position: absolute; left: 5
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(If the border style is ’none’,
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’max-width’ Value: Initial: App
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10.6.1 Inline, non-replaced element
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Value: Initial: Applies to: | | n
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. We recommend a computed value for
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Contents 11 Visual effects 11.1 Ove
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DIV I didn’t like the play, but t
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(0, 0) (50, 0) clip region (0, 55)
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onclick=’show("container2");hid
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12 Generated content, automatic num
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the pseudo-element will behave as i
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’block’: the pseudo-element is
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Approximate rendering ISO 10646 cod
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Value: [ ? ]+ | none | inherit Ini
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Example(s): The following style she
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first or last line box exists in a
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This is a very short document. This
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decimal Decimal numbers, beginning
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inside The marker box is the first
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OL.alpha { list-style: lower-alpha
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Contents 13 Paged media 13.1 Introd
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Sheet Page box A D Page content B C
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13.2.3 Crop marks: the ’marks’
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13.3.1 Break before/after elements:
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Value: | inherit Initial: 2 Applie
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13.4 Cascading in the page context
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Contents 14 Colors and Backgrounds
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This property sets the background i
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User agents may treat ’fixed’ a
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14.3 Gamma correction For informati
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Contents 15 Fonts 15.1 Introduction
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In the CSS2 font model, as in CSS1,
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15.2.2 Font family: the ’font-fam
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normal font. italic Specifies a fon
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1. ultra-condensed 2. extra-condens
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Specifies the aspect value. The num
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15.2.5 Shorthand font property: the
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menu The font used in menus (e.g.,
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Latin fonts Greek fonts Cyrillic fo
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page can be displayed. Progressive
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15.3.2 Descriptors for Selecting a
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15.3.3 Descriptors for Font Data Qu
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Value: [ [format( [, ]*)] | ] [,
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’stemv’ (Descriptor) Value: In
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the extras are ignored. [p. 42] Exa
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Swiss 721 light Swiss 721 Swiss 721
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The ideal solution would be to have
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15.4.11 Lower Baseline This gives t
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15.4.19 Vertical stem width This is
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The per-descriptor matching rules f
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The next example defines a family o
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Contents 16 Text 16.1 Indentation:
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16.3.1 Underlining, overlining, str
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Example(s): Consider this example:
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This property controls capitalizati
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Contents 17 Tables 17.1 Introductio
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other document languages (such as X
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’table-footer-group’) element T
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caption’s margin caption caption
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current margins text text text prev
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cells rows row groups columns colum
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The two algorithms are described be
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percentage values of ’height’ r
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Long distance calls $1.30 $2.50 $10
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In the separated borders model, thi
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The following example illustrates t
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solid The border is a single line s
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224.00 90.00 379.02 Seattle 27-
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Contents 18 User interface 18.1 Cur
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CaptionText Text in caption, size b
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Value: | invert | inherit Initial:
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Contents 19 Aural style sheets 19.1
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Another speech browser is being use
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19.5 Cue properties: ’cue-before
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Example(s): BLOCKQUOTE.sad { play-d
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elow Same as ’-90deg’. level Sa
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Values have the following meanings:
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none Punctuation is not to be spoke
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Appendix A. A sample style sheet fo
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Contents Appendix B. Changes from C
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Appendix C. Implementation and perf
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Multiple Master Font A Multiple Mas
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C.2 Font retrieval There are many d
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Stroke Variation Any (0) No Fit (1)
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to convert the information in a Tru
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Block Add Block name Unicode range
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307
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Contents Appendix D. The grammar of
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* after the "#"; e.g., "#000" is OK
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Contents Appendix E. References E.1
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[YACC] "YACC - Yet another compiler
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Appendix F. Property index Name ’
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Name Values ’float’ [p. 111] le
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Name ’overflow’ [p. 145] Values
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Appendix G. Descriptor index Name V
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:active, 294, 63 :after, 153, 68 :b
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’border-right-width’, 88 ’bor
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’definition-src’ (descriptor),
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hiragana-iroha, 169 horizontal marg
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message entity, 33 ’min-height’
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quad width, 44 ’quotes’, 157 RE
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’table-header-group’, 102 ’ta
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Cascading Style Sheets, Level 2 - World Wide Web Consortium

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