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

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TABLE { background: #ff0; border-collapse: collapse } TD { background: red; border: double black } 1 2 3 4 might be formatted as follows: 1 2 3 4 Table with three empty cells in the bottom row. 17.5.2 Table width algorithms: the ’table-layout’ property CSS does not define an "optimal" layout for tables since, in many cases, what is optimal is a matter of taste. CSS does define constraints that user agents must respect when laying out a table. User agents may use any algorithm they wish to do so, and are free to prefer rendering speed over precision, except when the "fixed layout algorithm" is selected. ’table-layout’ Value: auto | fixed | inherit Initial: auto Applies to: ’table’ and ’inline-table’ elements Inherited: no Percentages: N/A Media: visual The ’table-layout’ property controls the algorithm used to lay out the table cells, rows, and columns. Values have the following meaning: fixed Use the fixed table layout algorithm auto Use any automatic table layout algorithm 256
The two algorithms are described below. Fixed table layout With this (fast) algorithm, the horizontal layout of the table does not depend on the contents of the cells; it only depends on the table’s width, the width of the columns, and borders or cell spacing. The table’s width may be specified explicitly with the ’width’ property. A value of ’auto’ (for both ’display: table’ and ’display: inline-table’) means use the automatic table layout [p. 257] algorithm. In the fixed table layout algorithm, the width of each column is determined as follows: 1. A column element with a value other than ’auto’ for the ’width’ property sets the width for that column. 2. Otherwise, a cell in the first row with a value other than ’auto’ for the ’width’ property sets the width for that column. If the cell spans more than one column, the width is divided over the columns. 3. Any remaining columns equally divide the remaining horizontal table space (minus borders or cell spacing). The width of the table is then the greater of the value of the ’width’ property for the table element and the sum of the column widths (plus cell spacing or borders). If the table is wider than the columns, the extra space should be distributed over the columns. In this manner, the user agent can begin to lay out the table once the entire first row has been received. Cells in subsequent rows do not affect column widths. Any cell that has content that overflows uses the ’overflow’ property to determine whether to clip the overflow content. Automatic table layout In this algorithm (which generally requires no more than two passes), the table’s width is given by the width of its columns (and intervening borders [p. 261] ). This algorithm reflects the behavior of several popular HTML user agents at the writing of this specification. UAs are not required to implement this algorithm to determine the table layout in the case that ’table-layout’ is ’auto’; they can use any other algorithm. This algorithm may be inefficient since it requires the user agent to have access to all the content in the table before determining the final layout and may demand more than one pass. Column widths are determined as follows: 1. Calculate the minimum content width (MCW) of each cell: the formatted content may span any number of lines but may not overflow the cell box. If the specified ’width’ (W) of the cell is greater than MCW, W is the minimum cell width. A value of ’auto’ means that MCW is the minimum cell width. Also, calculate the "maximum" cell width of each cell: formatting then content without breaking lines other than where explicit line breaks occur. 2. For each column, determine a maximum and minimum column width from the cells that span only that column. The minimum is that required by the cell with the largest minimum cell width (or the column ’width’, whichever is 257
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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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Page 217 and 218: 15.3.3 Descriptors for Font Data Qu
Page 219 and 220: Value: [ [format( [, ]*)] | ] [,
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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
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Page 272 and 273: help Help is available for the obje
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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 304 and 305: Block Add Block name Unicode range
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This table suggests where such info
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308
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pseudo_page : ’:’ IDENT ; font_
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{num}rad {num}grad {num}ms {num}s {
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[RFC1808] "Relative Uniform Resourc
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[RFC1630] "Universal Resource Ident
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Name ’border-top-width’ [p. 88]
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Name ’list-style-type’ [p. 168]
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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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