csswg-drafts/css2/ui.src at 1ff33bd7ae12a1d886c3b3aa66049a540de58b13 · w3c/csswg-drafts · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
<html lang="en">
<!-- $Id: ui.src,v 2.35 2006-06-02 18:30:14 bbos Exp $ -->
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>User interface</title>
<meta name="editor" lang="tr" content="Tantek &Ccedil;elik">
<!-- Changed by: Tantek Celik, 2005-06-04 -->
<style type="text/css">
.current,.proposed,span.delcurrent { background:#feb }
ins.proposed,span.insproposed { background:#bfb }
del.proposed,span.delproposed { background:#fbb }
span.insproposed { text-decoration:underline }
span.delproposed,span.delcurrent { text-decoration:line-through }
body>del,body>ins {display:block}
</style>
</head>
<body>
<h1>User interface</h1>

<h2><a name="cursor-props">Cursors:</a> the <span
class="propinst-cursor">'cursor'</span> property</h2>

<!-- #include src=properties/cursor.srb -->

<p>This property specifies the type of cursor to be displayed for the
	pointing device. Values have the following meanings:
</p>

<dl>
<dt>auto</dt>
<dd>The UA determines the cursor to display based on the current
context.</dd>

<dt>crosshair</dt>
<dd>A simple crosshair (e.g., short line segments resembling a "+" sign).
</dd>
<dt>default</dt>
<dd>The platform-dependent default cursor. Often rendered as an arrow.
</dd>
<dt>pointer</dt>
<dd>The cursor is a pointer that indicates a link.
</dd>
<dt>move</dt>
<dd>Indicates something is to be moved.
</dd>
<dt>e-resize, ne-resize, nw-resize, n-resize, se-resize,
sw-resize, s-resize, w-resize</dt>

<dd>Indicate that some edge is to be moved. For example, the
'se-resize' cursor is used when the movement starts from the
south-east corner of the box.
</dd>
<dt>text</dt>
<dd>Indicates text that may be selected. Often rendered as an I-beam.
</dd>
<dt>wait,</dt>
<dd>Indicates that the program is busy and the user should
	  wait. Often rendered as a watch or hourglass.
</dd>
<dt>progress</dt>
<dd>A progress indicator.  The program is performing some processing,
but is different from 'wait' in that the user may still interact with the program.
Often rendered as a spinning beach ball,
or an arrow with a watch or hourglass.
</dd>
<dt>help</dt>
<dd>Help is available for the object under the cursor. Often rendered
	  as a question mark or a balloon.
</dd>
<dt><span class="index-inst" title="&lt;uri&gt;"><span
class="value-inst-uri">&lt;uri&gt;</span></span></dt>
<dd>The user agent retrieves the cursor from the resource
designated by the URI. If the user agent cannot handle
the first cursor of a list of cursors, it should attempt
to handle the second, etc. If the user agent cannot handle
any user-defined cursor, it must use the generic cursor
at the end of the list.
</dd>
</dl>

<div class="example">
<pre><code class="css">
:link,:visited { cursor: url(example.svg#linkcursor), url(hyper.cur), pointer }
</code></pre>
<p>This example sets the cursor on all hyperlinks (whether visited or not)
to an external <a href="http://www.w3.org/TR/SVG/interact.html#CursorElement">SVG cursor</a>.
User agents that don't support SVG cursors would simply skip to the
next value and attempt to use the "hyper.cur" cursor.
If that cursor format was also not supported, the UA would skip to the next value and simply render the 'pointer' cursor.
</p>
</div>


<h2><a name="system-colors">System Colors</a></h2>

<div class="note"><p><em><strong>Note.</strong>
The System Colors are
<a href="http://www.w3.org/TR/2003/CR-css3-color-20030514/#css2-system">deprecated in the CSS3 Color Module</a>.
</em></p>
</div>

<p>In addition to being able to assign pre-defined <a
href="syndata.html#color-units">color values</a> to text, backgrounds, etc., CSS2 introduced a set of named color values that allows authors to specify colors in a manner that integrates them into the operating system's graphic environment.
</p>

<p>For systems that do not have a corresponding value, the
specified value should be mapped to the nearest system value, or to a default color.</p>

<p>The following lists additional values for color-related CSS properties and their general meaning. Any color property (e.g., <span
class="propinst-color">'color'</span> or <span
class="propinst-background-color">'background-color'</span>) can take
one of the following names. Although these are case-insensitive, it is
recommended that the mixed capitalization shown below be used, to
make the names more legible.</p>

<dl>
<dt>ActiveBorder</dt>
<dd>Active window border.</dd>
<dt>ActiveCaption</dt>
<dd>Active window caption.</dd>
<dt>AppWorkspace</dt>
<dd>Background color of multiple document interface.</dd>
<dt>Background</dt>
<dd>Desktop background.</dd>
<dt>ButtonFace</dt>
<dd>Face color for three-dimensional display elements.</dd>
<dt>ButtonHighlight</dt>
<dd>Highlight color for three-dimensional display elements (for
    edges facing away from the light source).</dd>
<dt>ButtonShadow</dt>
<dd>Shadow color for three-dimensional display elements.</dd>
<dt>ButtonText</dt>
<dd>Text on push buttons.</dd>
<dt>CaptionText</dt>
<dd>Text in caption, size box, and scrollbar arrow box.</dd>
<dt>GrayText</dt>
<dd>Grayed (disabled) text. This color is set to #000 if
the current display driver does not support a solid gray color.</dd>
<dt>Highlight</dt>
<dd>Item(s) selected in a control.</dd>
<dt>HighlightText</dt>
<dd>Text of item(s) selected in a control.</dd>
<dt>InactiveBorder</dt>
<dd>Inactive window border.</dd>
<dt>InactiveCaption</dt>
<dd>Inactive window caption.</dd>
<dt>InactiveCaptionText</dt>
<dd>Color of text in an inactive caption.</dd>
<dt>InfoBackground</dt>
<dd>Background color for tooltip controls.</dd>
<dt>InfoText</dt>
<dd>Text color for tooltip controls.</dd>
<dt>Menu</dt>
<dd>Menu background.</dd>
<dt>MenuText</dt>
<dd>Text in menus.</dd>
<dt>Scrollbar</dt>
<dd>Scroll bar gray area.</dd>
<dt>ThreeDDarkShadow</dt>
<dd>Dark shadow for three-dimensional display elements.</dd>
<dt>ThreeDFace</dt>
<dd>Face color for three-dimensional display elements.</dd>
<dt>ThreeDHighlight</dt>
<dd>Highlight color for three-dimensional display elements.</dd>
<dt>ThreeDLightShadow</dt>
<dd>Light color for three-dimensional display elements
(for edges facing the light source).</dd>
<dt>ThreeDShadow</dt>
<dd>Dark shadow for three-dimensional display elements.</dd>
<dt>Window</dt>
<dd>Window background.</dd>
<dt>WindowFrame</dt>
<dd>Window frame.</dd>
<dt>WindowText</dt>
<dd>Text in windows.</dd>
</dl>

<div class="example"><p>
For example, to set the foreground and background colors of a paragraph
to the same foreground and background colors of the user's window,
write the following:
</p>
<pre><code class="css">
p { color: WindowText; background-color: Window }
</code></pre>
</div>

<h2><a name="system-fonts">User preferences for fonts</a></h2>

<p>As for colors, authors may specify fonts in a way that makes use of
a user's system resources. Please consult the <span
class="propinst-font">'font'</span> property for details.
</p>
<h2><a name="dynamic-outlines">Dynamic outlines:</a> the <span
class="index-def" title="outline">'outline'</span> property</h2>

<p>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. CSS&nbsp;2.1 outlines differ from <a
href="box.html#border-properties">borders</a> in the following
ways:</p>

<ol>
<li>Outlines do not take up space. </li>
<li>Outlines may be non-rectangular. </li>
</ol>

<p>The outline properties control the style of these dynamic outlines.
</p>
<!-- #include src=properties/outline.srb -->
<!-- #include src=properties/outline-width.srb -->
<!-- #include src=properties/outline-style.srb -->
<!-- #include src=properties/outline-color.srb -->

<p>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 or overflow.
</p>
<p>The outline may be drawn starting just outside the <a
href="box.html#border-edge">border edge</a>.
</p>
<p>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 <a
href="box.html#border-properties">borders</a>, the outline is not
open at the line box's end or start, but is always fully connected if possible.
</p>
<p>The <span class="propinst-outline-width">'outline-width'</span>
property accepts the same values as <span
class="propinst-border-width">'border-width'</span>.
</p>
<p>The <span class="propinst-outline-style">'outline-style'</span>
property accepts the same values as <span
class="propinst-border-style">'border-style'</span>,
except that 'hidden' is not a legal outline style.
</p>
<p>The <span class="propinst-outline-color">'outline-color'</span>
accepts all colors, as well as the keyword <span class="index-def"
title="invert"><a class="value-def"
name="value-def-invert">'invert'</a></span>. '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.
</p>
<p>
Conformant UAs may ignore the 'invert' value on platforms that do not
support color inversion of the pixels on the screen.  If the UA does not
support the 'invert' value then the initial value of the 'outline-color'
property is the value of the 'color' property, similar to the initial value
of the 'border-top-color' property.
</p>
<p>The <span class="propinst-outline">'outline'</span> property is a
shorthand property, and sets all three of <span
class="propinst-outline-style">'outline-style'</span>, <span
class="propinst-outline-width">'outline-width'</span>, and <span
class="propinst-outline-color">'outline-color'</span>.
</p>
<div class="note"><p><em><strong>Note.</strong>
The outline is the same on all sides. In
contrast to borders, there is no 'outline-top' or 'outline-left'
property.
</em></p>
</div>
<p>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.
</p>
<div class="note"><p>
<em><strong>Note.</strong>
Since the 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.
</em></p>
</div>

<div class="example"><p>
Here's an example of drawing a
thick outline around a BUTTON element:
</p>
<pre><code class="css">
button { outline-width : thick }
</code></pre>

<p>Scripts may be used to dynamically change the width
of the outline, without provoking a reflow.
</p>
</div>

<h3>Outlines and the focus</h3>

<p>Graphical user interfaces may use outlines around elements to tell
the user which element on the page has the <span class="index-def"
title="focus"><dfn>focus</dfn></span>. 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 <a
href="media.html#interactive-media-group">interactive media group</a>
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.
</p>
<div class="example">
<p>For example, to draw a thick black line around an element when it
has the focus, and a thick red line when it is active, the following
rules can be used:
</p>
<pre><code class="css">
:focus  { outline: thick solid black }
:active { outline: thick solid red }
</code></pre>
</div>

<h2>Magnification</h2>

<p>The CSS working group considers that the magnification of a
document or portions of a document should not be specified through
style sheets. User agents may support such magnification in different ways
(e.g., larger images, louder sounds, etc.)
</p>

<p>When magnifying a page, UAs should preserve the relationships
between positioned elements. For example, a comic strip may be
composed of images with overlaid text elements. When magnifying this
page, a user agent should keep the text within the comic strip balloon.
</p>
</body>
</html>