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18.3 User preferences for fonts As for colors, authors may specify fonts in a way that makes use of a user’s system resources. Please consult the ’font’ property for details. 18.4 Dynamic outlines: the ’outline’ property At times, style sheet authors may want to create outlines around visual objects such as buttons, active form fields, image maps, etc., to make them stand out. <strong>CSS2</strong> outlines differ from borders [p. 88] in the following ways: 1. Outlines do not take up space. 2. Outlines may be non-rectangular. The outline properties control the style of these dynamic outlines. ’outline’ Value: [ || || ] | inherit Initial: see individual properties Applies to: all elements Inherited: no Percentages: N/A Media: visual, interactive ’outline-width’ Value: | inherit Initial: medium Applies to: all elements Inherited: no Percentages: N/A Media: visual, interactive ’outline-style’ Value: | inherit Initial: none Applies to: all elements Inherited: no Percentages: N/A Media: visual, interactive ’outline-color’ 274
Value: | invert | inherit Initial: invert Applies to: all elements Inherited: no Percentages: N/A Media: visual, interactive The outline created with the outline properties is drawn "over" a box, i.e., the outline is always on top, and doesn’t influence the position or size of the box, or of any other boxes. Therefore, displaying or suppressing outlines does not cause reflow. The outline is drawn starting just outside the border edge [p. 82] . Outlines may be non-rectangular. For example, if the element is broken across several lines, the outline is the minimum outline that encloses all the element’s boxes. In contrast to borders [p. 88] , the outline is not open at the line box’s end or start, but is always fully connected. The ’outline-width’ property accepts the same values as ’border-width’. The ’outline-style’ property accepts the same values as ’border-style’, except that ’hidden’ is not a legal outline style. The ’outline-color’ accepts all colors, as well as the keyword ’invert’. ’Invert’ is expected to perform a color inversion on the pixels on the screen. This is a common trick to ensure the focus border is visible, regardless of color background. The ’outline’ property is a shorthand property, and sets all three of ’outline-style’, ’outline-width’, and ’outline-color’. Note that the outline is the same on all sides. In contrast to borders, there is no ’outline-top’ or ’outline-left’ property. This specification does not define how multiple overlapping outlines are drawn, or how outlines are drawn for boxes that are partially obscured behind other elements. Note. Since the focus outline does not affect formatting (i.e., no space is left for it in the box model), it may well overlap other elements on the page. Example(s): Here’s an example of drawing a thick outline around a BUTTON element: BUTTON { outline-width : thick } Scripts may be used to dynamically change the width of the outline, without provoking reflow. 18.4.1 Outlines and the focus Graphical user interfaces may use outlines around elements to tell the user which element on the page has the focus. These outlines are in addition to any borders, and switching outlines on and off should not cause the document to reflow. The focus is the subject of user interaction in a document (e.g., for entering text, selecting a button, etc.). User agents supporting the interactive <strong>media</strong> group [p. 79] must keep track of where the focus lies and must also represent the focus. This may be done by using dynamic outlines in conjunction with the :focus pseudo-class. 275
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REC-CSS2-19980512 Cascading Style S
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Quick Table of Contents 1 About the
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4.3.4 URL + URN = URI . . . . . . .
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9.7 Relationships between ’displa
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cursive . . . . . . . . . . . . . 2
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B.1 New functionality . . . . . . .
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Section 2: An introduction to CSS2
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Initial This part specifies the pro
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The section on Paged Media was in l
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Contents 2 Introduction to CSS2 2.1
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CSS2 has more than 100 different pr
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Adding more rules to the style shee
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Simplicity. CSS2 is more complex th
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Document language The encoding lang
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3.2 Conformance This section define
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Contents 4 CSS2 syntax and basic da
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Macro Definition ident name nmstart
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In fact, these two methods may be c
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P[example="public class foo\ {\ pri
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A user agent conforming to a future
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0.28 mm 1.4 mm viewer 28 inch 71 cm
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Example(s): An example without quot
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Values outside the device gamut sho
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When a style sheet resides in a sep
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Contents 5 Selectors 5.1 Pattern ma
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5.2 Selector syntax A simple select
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5.6 Child selectors A child selecto
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Example(s): The following rule hide
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H1#chapter1 { text-align: center }
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Example(s): The following rule sets
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5.11.4 The language pseudo-class: :
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The following CSS2 will make a drop
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6 Assigning property values, Cascad
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BODY { font-size: 10pt } H1 { font-
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6.4.1 Cascading order To find the v
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author style sheet and may be overr
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Link to a target medium The bo
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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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Page 241 and 242: Example(s): Consider this example:
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Page 249 and 250: ’table-footer-group’) element T
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Page 262 and 263: The lengths specify the distance th
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Page 266 and 267: An example of a table with collapse
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Page 272 and 273: help Help is available for the obje
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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:
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Page 292 and 293: SUB { vertical-align: sub } SUP { v
Page 294 and 295: Dynamic outlines [p. 274] . B.2 Upd
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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
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Page 310 and 311: pseudo_page : ’:’ IDENT ; font_
Page 312 and 313: {num}rad {num}grad {num}ms {num}s {
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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
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Name Values Initial value ’mathli
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’ascent’ (descriptor), 222 aspe
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close-quote, 159, 155 collapsing ma
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font family, 198 font set, 199 font
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definition of, 43 ’letter-spacing
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page model, 175 page selector, 176
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simple selector, 55 ’size’, 177
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valid style sheet, 29 value, 41 ver
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