-
Notifications
You must be signed in to change notification settings - Fork 791
Expand file tree
/
Copy pathOverview.src.html
More file actions
1540 lines (1285 loc) · 83.1 KB
/
Overview.src.html
File metadata and controls
1540 lines (1285 loc) · 83.1 KB
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
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
<!doctype html>
<html lang="en-US">
<head>
<meta charset=utf-8>
<title>CSSOM View Module</title>
<style>
.propdef { font:inherit; line-height:2.3 }
</style>
<link rel=stylesheet href=../default.css>
<link rel="stylesheet" href="https://www.w3.org/StyleSheets/TR/W3C-[STATUS]">
</head>
<body class="draft">
<div class="head">
<!--logo-->
<h1>CSSOM View Module</h1>
<h2 class="no-num no-toc" id="w3c-doctype">[LONGSTATUS] [DATE: 3 August 2002]</h2>
<dl>
<dt>This Version:</dt>
<dd class=dontpublish><a href="http://dev.w3.org/csswg/cssom-view/">http://dev.w3.org/csswg/cssom-view/</a></dd>
<dd class=publish><a href="[VERSION]">[VERSION]</a></dd>
<dt class=dontpublish>Participate:</dt>
<dd class=dontpublish><a href="mailto:www-style@w3.org?subject=%5Bcssom-view%5D%20">www-style@w3.org</a>
(<a href="http://lists.w3.org/Archives/Public/www-style/">archives</a>)
<dd class=dontpublish><a href="https://www.w3.org/Bugs/Public/enter_bug.cgi?product=CSS&component=CSSOM%20View">File a bug</a>
(<a href="https://www.w3.org/Bugs/Public/buglist.cgi?component=CSSOM%20View&product=CSS&resolution=---">open bugs</a>)
<script async="" src="https://w3c-test.org/resources.whatwg.org/file-bug.js"></script>
<dd class=dontpublish><a href="irc://irc.w3.org:6665/css">IRC: #css on W3C</a></dd>
<dt class=publish>Latest Version:</dt>
<dd class=publish><a href="[LATEST]">[LATEST]</a></dd>
<dt class=publish>Latest Editor Draft:</dt>
<dd class=publish><a href="http://dev.w3.org/csswg/cssom-view/">http://dev.w3.org/csswg/cssom-view/</a></dd>
<dt class=dontpublish>Previous Versions:</dt>
<dd class=dontpublish><a href="http://www.w3.org/TR/2009/WD-cssom-view-20090804/">http://www.w3.org/TR/2009/WD-cssom-view-20090804/</a></dd>
<dd class=dontpublish><a href="http://www.w3.org/TR/2008/WD-cssom-view-20080222/">http://www.w3.org/TR/2008/WD-cssom-view-20080222/</a></dd>
<dd class=dontpublish><a href="http://www.w3.org/TR/2000/REC-DOM-Level-2-Style-20001113/">http://www.w3.org/TR/2000/REC-DOM-Level-2-Style-20001113/</a></dd>
<dt>Editors:</dt>
<dd>Simon Pieters
(<a href="http://www.opera.com/">Opera Software ASA</a>)
<<a href="mailto:simponp@opera.com">simonp@opera.com</a>></dd>
<dd><a href="http://www.w3.org/wiki/User:Gadams">Glenn Adams</a>
(<a href="http://www.cox.com/">Cox Communications, Inc.</a>)
<<a href="mailto:glenn.adams@cox.com">glenn.adams@cox.com</a>></dd>
<dt>Previous Editor:</dt>
<dd><a href="http://annevankesteren.nl/">Anne van Kesteren</a>
(<a href="http://www.opera.com/">Opera Software ASA</a>)
<<a href="mailto:annevk@annevk.nl">annevk@annevk.nl</a>></dd>
</dl>
<!--copyright-->
</div>
<hr>
<h2 class="no-num no-toc">Abstract</h2>
<p>The APIs introduced by this specification provide authors with a way to
inspect and manipulate the visual view of a document. This includes
getting the position of element layout boxes, obtaining the width
of the viewport through script, and also scrolling an element.</p>
<h2 id="sotd" class="no-num no-toc">Status of This Document</h2>
<p><em>This section describes the status of this document at the time of
its publication. Other documents may supersede this document. A list of
current W3C publications and the latest revision of this technical report
can be found in the <a href="http://www.w3.org/TR/">W3C technical reports
index at http://www.w3.org/TR/.</a></em>
<p>This is the [DATE: 3 August 2002] [LONGSTATUS] of CSSOM View. Please send
comments to
<a href="mailto:www-style@w3.org?subject=%5Bcssom-view%5D%20">www-style@w3.org</a>
(<a href="http://lists.w3.org/Archives/Public/www-style/">archived</a>)
with <samp>[cssom-view]</samp> at the start of the subject line.
<p>This document was produced by the <a
href="http://www.w3.org/Style/CSS/members">CSS Working Group</a> (part of
the <a href="http://www.w3.org/Style/">Style Activity</a>).
<p>This document was produced by a group operating under the <a
href="http://www.w3.org/Consortium/Patent-Policy-20040205/">5 February
2004 W3C Patent Policy</a>. W3C maintains a <a
href="http://www.w3.org/2004/01/pp-impl/32061/status"
rel=disclosure>public list of any patent disclosures</a> made in
connection with the deliverables of the group; that page also includes
instructions for disclosing a patent. An individual who has actual
knowledge of a patent which the individual believes contains <a
href="http://www.w3.org/Consortium/Patent-Policy-20040205/#def-essential">Essential
Claim(s)</a> must disclose the information in accordance with <a
href="http://www.w3.org/Consortium/Patent-Policy-20040205/#sec-Disclosure">section
6 of the W3C Patent Policy</a>.</p>
<p>Publication as a Working Draft does not imply endorsement by the W3C
Membership. This is a draft document and may be updated, replaced or
obsoleted by other documents at any time. It is inappropriate to cite this
document as other than work in progress.
<h2 id="toc" class="no-num no-toc">Table of Contents</h2>
<!-- toc -->
<h2>Background</h2>
<p>Many of the features defined in this specification have been supported
by browsers for a long period of time. The goal of this specification is
to define these features in such a way that they can be implemented by all
browsers in an interoperable manner. The specification also defines a
couple of new features that will hopefully be useful to authors. (If they
are not you can bug us!)</p>
<h2>Conformance</h2>
<p>All diagrams, examples, and notes in this specification are
non-normative, as are all sections explicitly marked non-normative.
Everything else in this specification is normative.
<p>The key words "MUST", "MUST NOT", "REQUIRED", <!--"SHALL", "SHALL
NOT",--> "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and
"OPTIONAL" in the normative parts of this document are to be
interpreted as described in RFC2119. For readability, these words do
not appear in all uppercase letters in this specification. <span
data-anolis-ref>RFC2119</span>
<p>Requirements phrased in the imperative as part of algorithms
(such as "strip any leading space characters" or "return false and
terminate these steps") are to be interpreted with the meaning of the
key word ("must", "should", "may", etc) used in introducing the
algorithm.
<p>Conformance requirements phrased as algorithms or specific steps
may be implemented in any manner, so long as the end result is
equivalent. (In particular, the algorithms defined in this
specification are intended to be easy to follow, and not intended to
be performant.)
<p id="hardwareLimitations">User agents may impose
implementation-specific limits on otherwise unconstrained inputs,
e.g. to prevent denial of service attacks, to guard against running
out of memory, or to work around platform-specific limitations. <!--fingerprint-->
<p>When a method or an attribute is said to call another method or attribute, the user agent must invoke its internal API for that attribute or method so that
e.g. the author can't change the behavior by overriding attributes or methods with custom properties or functions in ECMAScript.
<p>Unless otherwise stated, string comparisons are done in a <span data-anolis-spec=dom>case-sensitive</span> manner.
<p>A conforming user agent implements all the requirements made by this
specification.</p>
<h3>Web IDL</h3>
<p>The IDL fragments in this specification must be
interpreted as required for conforming IDL fragments, as described in the
Web IDL specification. <span data-anolis-ref>WEBIDL</span>
<h2>Terminology</h2>
<p>Terminology used in this specification is from
DOM,
CSSOM and
HTML.
<span data-anolis-ref>DOM</span>
<span data-anolis-ref>CSSOM</span>
<span data-anolis-ref>HTML</span>
<p class="issue"><dfn><code>MouseEvent</code></dfn> and <dfn><code>MouseEventInit</code></dfn> are defined in …
<p><dfn>The HTML <code title>body</code> element</dfn> is the first
<code title>body</code>
<span data-anolis-spec=html title="HTML elements">HTML element</span> child of the root
<span data-anolis-spec=html title="HTML elements">HTML element</span> <code title>html</code>.</p>
<p><dfn>Content edge</dfn>,
<dfn>padding edge</dfn>,
<dfn>border edge</dfn>,
<dfn>margin edge</dfn> and
<dfn>canvas</dfn> are defined by CSS.
<!--<span data-anolis-ref>CSS</span>-->
<p><dfn>Viewport</dfn> and
<dfn>initial containing block</dfn> are
defined by CSS 2.1 unless there is an ancestor <code title>foreignObject</code>
element in the <code title>http://www.w3.org/2000/svg</code> namespace that has an associated <span>SVG layout box</span> in which
case that element acts as viewport and initial containing block.
<!--<span data-anolis-ref>CSS</span>-->
<p><dfn>Block flow direction</dfn> and <dfn>inline base direction</dfn> are defined in CSS Writing Modes Module. <span data-anolis-ref>CSSWRITINGMODES</span>
<p>A scrolling box of a <span>viewport</span> or element has two <dfn>overflow directions</dfn>, depending on the <span>viewport</span>'s or element's
<span>block flow direction</span> and <span>inline base direction</span>, as follows:
<dl class=switch>
<dt>If the <span>block flow direction</span> is top-to-bottom and the <span>inline base direction</span> is left-to-right
<dt>If the <span>block flow direction</span> is left-to-right and the <span>inline base direction</span> is left-to-right
<dd><p>Rightward and downward.
<dt>If the <span>block flow direction</span> is top-to-bottom and the <span>inline base direction</span> is right-to-left
<dt>If the <span>block flow direction</span> is right-to-left and the <span>inline base direction</span> is left-to-right
<dd><p>Leftward and downward.
<dt>If the <span>block flow direction</span> is right-to-left and the <span>inline base direction</span> is right-to-left
<dd><p>Leftward and upward.
<dt>If the <span>block flow direction</span> is left-to-right and the <span>inline base direction</span> is right-to-left
<dd><p>Righward and upward.
</dl>
<p>The term <dfn>scrolling area</dfn> refers to a box of a <span>viewport</span> or an element that has the following edges, depending on the
<span>viewport</span>'s or element's scrolling box's <span>overflow directions</span>.
<table class="complex data">
<thead>
<tr>
<th>If the <span>overflow directions</span> are…
<th>For a <span>viewport</span>
<th>For an element
<tbody>
<tr>
<td>rightward and downward
<td class=long>
<dl>
<dt>top edge
<dd><p>The top edge of the <span>initial containing block</span>.
<dt>right edge
<dd><p>The right-most edge of the right edge of the <span>initial containing block</span> and the right <span>margin edge</span> of the
<span>viewport</span>'s all descendant boxes.
<dt>bottom edge
<dd><p>The bottom-most edge of the bottom edge of the <span>initial containing block</span> and the bottom <span>margin edge</span> of the
<span>viewport</span>'s all descendant boxes.
<dt>left edge
<dd><p>The left edge of the <span>initial containing block</span>.
</dl>
<td class=long>
<dl>
<dt>top edge
<dd><p>The element's top <span>padding edge</span>.
<dt>right edge
<dd><p>The right-most edge of the element's right &l
133E
t;span>padding edge</span> and the right <span>margin edge</span> of the element's all descendant boxes,
excluding boxes that have an ancestor of the element as their containing block.
<dt>bottom edge
<dd><p>The bottom-most edge of the element's bottom <span>padding edge</span> and the bottom <span>margin edge</span> of the element's all descendant boxes,
excluding boxes that have an ancestor of the element as their containing block.
<dt>left edge
<dd><p>The element's left <span>padding edge</span>.
</dl>
<tr>
<td>leftward and downward
<td class=long>
<dl>
<dt>top edge
<dd><p>The top edge of the <span>initial containing block</span>.
<dt>right edge
<dd><p>The right edge of the <span>initial containing block</span>.
<dt>bottom edge
<dd><p>The bottom-most edge of the bottom edge of the <span>initial containing block</span> and the bo
F882
ttom <span>margin edge</span> of the
<span>viewport</span>'s all descendant boxes.
<dt>left edge
<dd><p>The left-most edge of the left edge of the <span>initial containing block</span> and the left <span>margin edge</span> of the
<span>viewport</span>'s all descendant boxes.
</dl>
<td class=long>
<dl>
<dt>top edge
<dd><p>The element's top <span>padding edge</span>.
<dt>right edge
<dd><p>The element's right <span>padding edge</span>.
<dt>bottom edge
<dd><p>The bottom-most edge of the element's bottom <span>padding edge</span> and the bottom <span>margin edge</span> of the element's all descendant boxes,
excluding boxes that have an ancestor of the element as their containing block.
<dt>left edge
<dd><p>The left-most edge of the element's left <span>padding edge</span> and the left <span>margin edge</span> of the element's all descendant boxes,
excluding boxes that have an ancestor of the element as their containing block.
</dl>
<tr>
<td>leftward and upward
<td class=long>
<dl>
<dt>top edge
<dd><p>The top-most edge of the top edge of the <span>initial containing block</span> and the top <span>margin edge</span> of the
<span>viewport</span>'s all descendant boxes.
<dt>right edge
<dd><p>The right edge of the <span>initial containing block</span>.
<dt>bottom edge
<dd><p>The bottom edge of the <span>initial containing block</span>.
<dt>left edge
<dd><p>The left-most edge of the left edge of the <span>initial containing block</span> and the left <span>margin edge</span> of the
<span>viewport</span>'s all descendant boxes.
</dl>
<td class=long>
<dl>
<dt>top edge
<dd><p>The top-most edge of the element's top <span>padding edge</span> and the top <span>margin edge</span> of the element's all descendant boxes,
excluding boxes that have an ancestor of the element as their containing block.
<dt>right edge
<dd><p>The element's right <span>padding edge</span>.
<dt>bottom edge
<dd><p>The element's bottom <span>padding edge</span>.
<dt>left edge
<dd><p>The left-most edge of the element's left <span>padding edge</span> and the left <span>margin edge</span> of the element's all descendant boxes,
excluding boxes that have an ancestor of the element as their containing block.
</dl>
<tr>
<td>rightward and upward
<td class=long>
<dl>
<dt>top edge
<dd><p>The top-most edge of the top edge of the <span>initial containing block</span> and the top <span>margin edge</span> of the
<span>viewport</span>'s all descendant boxes.
<dt>right edge
<dd><p>The right-most edge of the right edge of the <span>initial containing block</span> and the right <span>margin edge</span> of the
<span>viewport</span>'s all descendant boxes.
<dt>bottom edge
<dd><p>The bottom edge of the <span>initial containing block</span>.
<dt>left edge
<dd><p>The left edge of the <span>initial containing block</span>.
</dl>
<td class=long>
<dl>
<dt>top edge
<dd><p>The top-most edge of the element's top <span>padding edge</span> and the top <span>margin edge</span> of the element's all descendant boxes,
excluding boxes that have an ancestor of the element as their containing block.
<dt>right edge
<dd><p>The right-most edge of the element's right <span>padding edge</span> and the right <span>margin edge</span> of the element's all descendant boxes,
excluding boxes that have an ancestor of the element as their containing block.
<dt>bottom edge
<dd><p>The element's bottom <span>padding edge</span>.
<dt>left edge
<dd><p>The element's left <span>padding edge</span>.
</dl>
</table>
<p>The <dfn>beginning edges</dfn> of a particular set of edges of a box or element are the following edges:
<dl class=switch>
<dt>If the <span>overflow directions</span> are rightward and downward
<dd><p>The top and left edges.
<dt>If the <span>overflow directions</span> are leftward and downward
<dd><p>The top and right edges.
<dt>If the <span>overflow directions</span> are leftward and upward
<dd><p>The bottom and right edges.
<dt>If the <span>overflow directions</span> are rightward and upward
<dd><p>The bottom and left edges.
</dl>
<p>The <dfn>ending edges</dfn> of a particular set of edges of a box or element are the following edges:
<dl class=switch>
<dt>If the <span>overflow directions</span> are rightward and downward
<dd><p>The bottom and right edges.
<dt>If the <span>overflow directions</span> are leftward and downward
<dd><p>The bottom and left edges.
<dt>If the <span>overflow directions</span> are leftward and upward
<dd><p>The top and left edges.
<dt>If the <span>overflow directions</span> are rightward and upward
<dd><p>The top and right edges.
</dl>
<p>The term <dfn>CSS layout box</dfn> refers to the same term in CSS. For the purpose
of the requirements in this specification, elements that have a computed value of the
'display' property that is 'table-column' or
'table-column-group' must be considered to have an associated <span>CSS
layout box</span> (the column or column group, respectively).</p>
<p>The term <dfn>SVG layout box</dfn> refers to the same term in SVG.
<p class=issue>The terms <span>CSS layout box</span> and <span>SVG layout box</span> are not currently defined by CSS or SVG.
<p>The term <dfn>layout box</dfn> refers to either a <span>CSS layout box</span> or an <span>SVG layout box</span>.
<h3>CSS pixels</h3>
<p>All coordinates and dimensions for the APIs defined in this
specification are in CSS pixels. <!--<span data-anolis-ref>CSS</span>-->
<p class="note">This does not apply to e.g.
<code title=dom-Window-matchMedia>matchMedia()</code> as the units
are explicitly given there.</p>
<h2>Common Infrastructure</h2>
<h3>Scrolling</h3>
<p>When a user agent is to <dfn>perform a scroll</dfn> of a scrolling box <var>box</var>, to a given position <var>position</var>, with a set of
steps <var>task</var>, an associated element <var>element</var> and optionally a scroll behavior <var>behavior</var> (which is
<code title>auto</code> if omitted), the following steps must be run:
<ol>
<li><p><span title=concept-smooth-scroll-aborted>Abort</span> any ongoing <span title=concept-smooth-scroll>smooth scroll</span> for <var>box</var>.
<li><p>If the user agent honors the '<span>scroll-behavior</span>' property and one of the following are true:
<ul>
<li><p><var>behavior</var> is <code title>auto</code> and <var>element</var> is not null and its computed value of the
'<span>scroll-behavior</span>' property is '<span title=scroll-behavior-smooth>smooth</span>'
<li><p><var>behavior</var> is <code title>smooth</code>
</ul>
<p>...then follow these substeps:
<ol>
<li><p>Perform a <span title=concept-smooth-scroll>smooth scroll</span> of <var>box</var> to <var>position</var>.
<li><p><span data-anolis-spec=html>Queue a task</span> to run <var>task</var>, unless a <span data-anolis-spec=html title=concept-task>task</span> to
run <var>task</var> is in the <span data-anolis-spec=html title="queue a task">queue</span>.
<li><p>Repeat the previous step in a user-agent-defined interval while the <span title=concept-smooth-scroll>smooth scroll</span> is ongoing, as well as when
the <span title=concept-smooth-scroll>smooth scroll</span> is <span title=concept-smooth-scroll-completed>completed</span> (but not if it is
<span title=concept-smooth-scroll-aborted>aborted</span>). <!--fingerprint-->
</ol>
<li><p>Otherwise, follow these substeps:
<ol>
<li><p>Perform an <span title=concept-instant-scroll>instant scroll</span> of <var>box</var> to <var>position</var>.
<li><p><span data-anolis-spec=html>Queue a task</span> to run <var>task</var>, unless a <span data-anolis-spec=html title=concept-task>task</span> to
run <var>task</var> is in the <span data-anolis-spec=html title="queue a task">queue</span>.
</ol>
</ol>
<p>When a user agent is to perform a <dfn title=concept-smooth-scroll>smooth scroll</dfn> of a scrolling box <var>box</var> to <var>position</var>,
it must update the scroll position of <var>box</var> in a user-agent-defined fashion over a user-agent-defined amount of time. When the scroll is
<dfn title="concept-smooth-scroll-completed">completed</dfn>, the scroll position of <var>box</var> must be <var>position</var>. The scroll can also
be <dfn title=concept-smooth-scroll-aborted>aborted</dfn>, either by an algorithm or by the user. <!--fingerprint-->
<p>When a user agent is to perform an <dfn title=concept-instant-scroll>instant scroll</dfn> of a scrolling box <var>box</var> to
<var>position</var>, it must update the scroll position of <var>box</var> to <var>position</var>.
<p>To <dfn>scroll to the beginning of the document</dfn> for a document <var>document</var>, follow these steps:
<ol>
<li><p>Let <var>viewport</var> be the <span>viewport</span> that is associated with <var>document</var>. <!-- This assumes that there is a viewport, since
it is only invoked when navigating -->
<li><p>Let <var>position</var> be the the scroll position <var>viewport</var> would have by aligning the <span>beginning edges</span> of the
<span>scrolling area</span> with the <span>beginning edges</span> of <var>viewport</var>.
<li><p>If <var>position</var> is the same as <var>viewport</var>'s current scroll position, and <var>viewport</var> does not have an ongoing
<span title=concept-smooth-scroll>smooth scroll</span>, abort these steps.
<li><p>Let <var>task</var> be these steps:
<ol>
<li><p><span data-anolis-spec=dom title=concept-event-fire>Fire an event</span> named <code title>scroll</code> that bubbles at <var>document</var>.
</ol>
<li><p><span>Perform a scroll</span> of <var>viewport</var> to <var>position</var>, with the set of steps <var>task</var>, and <var>document</var>'s root
element as the associated element, if there is one, or null otherwise.
</ol>
<p class=note>This algorithm is used when navigating to the <code title>#top</code> fragment identifier, as defined in HTML. <span data-anolis-ref>HTML</span>
<h2>Extensions to the <code title>Window</code> Interface</h2>
<pre class=idl>enum <dfn>ScrollBehavior</dfn> { "auto", "instant", "smooth" };
dictionary <dfn>ScrollOptions</dfn> {
double x;
double y;
<span>ScrollBehavior</span> behavior = "auto";
};
partial interface <span data-anolis-spec=html>Window</span> {
<span>MediaQueryList</span> <span title=dom-Window-matchMedia>matchMedia</span>(DOMString query);
readonly attribute <span>Screen</span> <span title=dom-Window-screen>screen</span>;
// viewport
readonly attribute double <span title=dom-Window-innerWidth>innerWidth</span>;
readonly attribute double <span title=dom-Window-innerHeight>innerHeight</span>;
// viewport scrolling
readonly attribute double <span title=dom-Window-scrollX>scrollX</span>;
readonly attribute double <span title=dom-Window-pageXOffset>pageXOffset</span>;
readonly attribute double <span title=dom-Window-scrollY>scrollY</span>;
readonly attribute double <span title=dom-Window-pageYOffset>pageYOffset</span>;
void <span title=dom-Window-scroll>scroll</span>(double x, double y, optional <span>ScrollOptions</span> options);
void <span title=dom-Window-scrollTo>scrollTo</span>(double x, double y, optional <span>ScrollOptions</span> options);
void <span title=dom-Window-scrollBy>scrollBy</span>(double x, double y, optional <span>ScrollOptions</span> options);
// client
readonly attribute double <span title=dom-Window-screenX>screenX</span>;
readonly attribute double <span title=dom-Window-screenY>screenY</span>;
readonly attribute double <span title=dom-Window-outerWidth>outerWidth</span>;
readonly attribute double <span title=dom-Window-outerHeight>outerHeight</span>;
};</pre>
<p>When the <dfn title=dom-Window-matchMedia><code>matchMedia(<var>query</var>)</code></dfn> method is invoked these steps must be run:</p>
<ol>
<li><p>Let <var>parsed media query list</var> be the result of
<span title='parse a media query list' data-anolis-spec=cssom>parsing</span>
<var>query</var>.</p></li>
<li><p>Return a <em>new</em> <code>MediaQueryList</code> object,
associated with the <code data-anolis-spec=html>Window</code> object, with
<var>parsed media query list</var> as its associated
media query list.</p></li>
</ol>
<p>The <dfn title=dom-Window-screen><code>screen</code></dfn> attribute must return the <code>Screen</code> object
associated with the <code data-anolis-spec=html>Window</code> object. It always returns the same
object.</p>
<p class='note'>Accessing <code title=dom-Window-screen>screen</code> through a <code data-anolis-spec=html>WindowProxy</code> object might yield different
results when the <code data-anolis-spec=dom>Document</code> is navigated.</p>
<p>The <dfn title=dom-Window-innerWidth><code>innerWidth</code></dfn> attribute must return the <span>viewport</span> width including the size of a rendered
scroll bar (if any), or zero if there is no <span>viewport</span>. <!--fingerprint--></p>
<div class='example'>
<p>The following snippet shows how to obtain the width of the viewport:</p>
<pre>var viewportWidth = innerWidth</pre>
</div>
<p>The <dfn title=dom-Window-innerHeight><code>innerHeight</code></dfn> attribute must return the <span>viewport</span> height including the size of a rendered
scroll bar (if any), or zero if there is no <span>viewport</span>. <!--fingerprint--></p>
<p>The <dfn title=dom-Window-scrollX><code>scrollX</code></dfn> attribute attribute must return the x-coordinate, relative to the <span>initial containing
block</span> origin, of the left of the <span>viewport</span>, or zero if there is no <span>viewport</span>. <!--fingerprint--></p>
<p>The <dfn title=dom-Window-pageXOffset><code>pageXOffset</code></dfn> attribute must return the value returned by the
<code title=dom-Window-scrollX>scrollX</code> attribute.</p>
<p>The <dfn title=dom-Window-scrollY><code>scrollY</code></dfn> attribute attribute must return the y-coordinate, relative to the <span>initial containing
block</span> origin, of the top of the <span>viewport</span>, or zero if there is no <span>viewport</span>. <!--fingerprint--></p>
<p>The <dfn title=dom-Window-pageYOffset><code>pageYOffset</code></dfn> attribute must return the value returned by the
<code title=dom-Window-scrollY>scrollY</code> attribute.</p>
<p>When the <dfn title=dom-Window-scroll><code>scroll(<var>x</var>, <var>y</var>, <var>options</var>)</code></dfn> method is invoked these
steps must be run:</p>
<ol>
<li><p>If there is no <span>viewport</span>, abort these steps.
<li><p>Let <var>viewport width</var> be the width of the <span>viewport</span> excluding the width of the scroll bar, if any.
<li><p>Let <var>viewport height</var> be the height of the <span>viewport</span> excluding the height of the scroll bar, if any.
<li>
<dl class=switch>
<dt>If the <span>viewport</span> has rightward <span title="overflow directions">overflow direction</span>
<dd><p>Let <var>x</var> be max(0, min(<var>x</var>,
<span>viewport</span> <span>scrolling area</span> width - <var>viewport width</var>)).</p></dd>
<dt>If the <span>viewport</span> has leftward <span title="overflow directions">overflow direction</span>
<dd><p>Let <var>x</var> be min(0, max(<var>x</var>,
<var>viewport width</var> - <span>viewport</span> <span>scrolling area</span>
width)).</p></dd>
</dl>
<li>
<dl class=switch>
<dt>If the <span>viewport</span> has downward <span title="overflow directions">overflow direction</span>
<dd><p>Let <var>y</var> be max(0, min(<var>y</var>,
<span>viewport</span> <span>scrolling area</span> height - <var>viewport height</var>)).</p></dd>
<dt>If the <span>viewport</span> has upward <span title="overflow directions">overflow direction</span>
<dd><p>Let <var>y</var> be min(0, max(<var>y</var>,
<var>viewport height</var> - <span>viewport</span> <span>scrolling area</span>
height)).</p></dd>
</dl>
<li><p>Let <var>position</var> be the scroll position the <span>viewport</span> would have by aligning the x-coordinate <var>x</var> of the
<span>viewport</span> <span>scrolling area</span> with the left of the <span>viewport</span> and aligning the y-coordinate <var>y</var> of the
<span>viewport</span> <span>scrolling area</span> with the top of the <span>viewport</span>.
<li><p>If <var>position</var> is the same as the <span>viewport</span>'s current scroll position, and the <span>viewport</span> does not have an ongoing
<span title=concept-smooth-scroll>smooth scroll</span>, abort these steps.
<li><p>Let <var>task</var> be these steps:
<ol>
<li><p><span data-anolis-spec=dom title=concept-event-fire>Fire an event</span> named <code title>scroll</code> that bubbles at the
<code data-anolis-spec=dom>Document</code> object.
</ol>
<li><p><span>Perform a scroll</span> of the <span>viewport</span> to <var>position</var>, with the set of steps <var>task</var>, and the
<code data-anolis-spec=dom>Document</code>'s root element as the associated element, if there is one, or null otherwise, and the scroll behavior being the
value of the <code title>behavior</code> dictionary member of <var>options</var>.
</ol>
<p>When the <dfn title=dom-Window-scrollTo><code>scrollTo(<var>x</var>, <var>y</var>, <var>options</var>)</code></dfn> method is invoked, the
user agent must act as if the <code title=dom-Window-scroll>scroll()</code> method was invoked with the same arguments.</p>
<p>When the <dfn title=dom-Window-scrollBy><code>scrollBy(<var>x</var>, <var>y</var>, <var>options</var>)</code></dfn> method is invoked, the
user agent must act as if the <code title=dom-Window-scroll>scroll()</code> method was invoked with
<var>x</var> plus <code title='dom-Window-scrollX'>scrollX</code>
as first argument and <var>y</var> plus
<code title='dom-Window-scrollY'>scrollY</code> as second argument.</p>
<p>The <dfn title=dom-Window-screenX><code>screenX</code></dfn> attribute must return the x-coordinate,
relative to the origin of the screen of the output device, of the left of
the client window as number of pixels, or zero if there is no such
thing. <!--fingerprint--></p>
<p>The <dfn title=dom-Window-screenY><code>screenY</code></dfn> attribute must return the y-coordinate,
relative to the origin of the screen of the output device, of the top of
the client window as number of pixels, or zero if there is no such
thing. <!--fingerprint--></p>
<p>The <dfn title=dom-Window-outerWidth><code>outerWidth</code></dfn> attribute must return the width of the
client window. If there is no client window this
attribute must return zero. <!--fingerprint--></p>
<p>The <dfn title=dom-Window-outerHeight><code>outerHeight</code></dfn> attribute must return the height of the
client window. If there is no client window this
attribute must return zero. <!--fingerprint--></p>
<h3>The <code title>MediaQueryList</code> Interface</h3>
<p>A <code>MediaQueryList</code> object has an associated media query list set on creation and an associated
<dfn>list of media query list listeners</dfn>, which is initially empty.</p>
<p>If the associated media query list changes in evaluation then, for each
listener in the <span>list of media query list listeners</span> — in
appending order, <span data-anolis-spec=html>queue a task</span> that invokes the listener,
passing as argument the <code>MediaQueryList</code> object.</p>
<div class='example'>
<p>A simple piece of code that detects changes in the orientation of the viewport can be written as follows:</p>
<pre>function handleOrientationChange(mql) {
if(mql.matches) // landscape
…
else
…
}
var mql = matchMedia("(orientation:landscape)")
mql.addListener(handleOrientationChange)</pre>
</div>
<pre class=idl>interface <dfn>MediaQueryList</dfn> {
readonly attribute DOMString <span title=dom-MediaQueryList-media>media</span>;
readonly attribute boolean <span title=dom-MediaQueryList-matches>matches</span>;
void <span title=dom-MediaQueryList-addListener>addListener</span>(<span>MediaQueryListListener</span> listener);
void <span title=dom-MediaQueryList-removeListener>removeListener</span>(<span>MediaQueryListListener</span> listener);
};
callback <dfn>MediaQueryListListener</dfn> = void (<span>MediaQueryList</span> list);</pre>
<p>The <dfn title=dom-MediaQueryList-media><code>media</code></dfn> attribute must return the
<span title='serialize a media query list' data-anolis-spec=cssom>serialized</span> form of the associated media query list.</p>
<p>The <dfn title=dom-MediaQueryList-matches><code>matches</code></dfn> attribute must return true if the associated media query list
matches the state of the rendered <code data-anolis-spec=dom>Document</code> and false if it does not. <!--fingerprint--></p>
<p>When the <dfn title=dom-MediaQueryList-addListener><code>addListener(<var>listener</var>)</code></dfn> method is invoked <var>listener</var> must
be appended to the <span>list of media query list listeners</span>, unless
it is already in the <span>list of media query list listeners</span>.</p>
<p>When the <dfn title=dom-MediaQueryList-removeListener><code>removeListener(<var>listener</var>)</code></dfn> method is invoked
<var>listener</var> must be removed from the <span>list of media query list listeners</span>.</p>
<h3>The <code title>Screen</code> Interface</h3>
<p>As its name suggests, the <code>Screen</code> interface represents information about the screen of the output device.</p>
<pre class=idl>interface <dfn>Screen</dfn> {
readonly attribute double <span title=dom-Screen-availWidth>availWidth</span>;
readonly attribute double <span title=dom-Screen-availHeight>availHeight</span>;
readonly attribute double <span title=dom-Screen-width>width</span>;
readonly attribute double <span title=dom-Screen-height>height</span>;
readonly attribute unsigned long <span title=dom-Screen-colorDepth>colorDepth</span>;
readonly attribute unsigned long <span title=dom-Screen-pixelDepth>pixelDepth</span>;
};</pre>
<p>The <dfn title=dom-Screen-availWidth><code>availWidth</code></dfn> attribute must return the available width of the rendering surface of the output
device. <!--fingerprint--></p>
<p>The <dfn title=dom-Screen-availHeight><code>availHeight</code></dfn> attribute must return the available height of the rendering surface of the output
device. <!--fingerprint--></p>
<p>The <dfn title=dom-Screen-width><code>width</code></dfn> attribute must return the width of the output device. <!--fingerprint--></p>
<p>The <dfn title=dom-Screen-height><code>height</code></dfn> attribute must return the height of the output device. <!--fingerprint--></p>
<p>The <dfn title=dom-Screen-colorDepth><code>colorDepth</code></dfn> attribute must return 24.</p>
<p>The <dfn title=dom-Screen-pixelDepth><code>pixelDepth</code></dfn> attribute must return 24.</p>
<p class=note>The <code title=dom-Screen-colorDepth>colorDepth</code> and <code title=dom-Screen-pixelDepth>pixelDepth</code> attributes are useless but are
included for compatibility.
<h2>Extensions to the <code title>Document</code> Interface</h2>
<pre class=idl>partial interface <span data-anolis-spec=dom>Document</span> {
<span data-anolis-spec=dom>Element</span>? <span title=dom-Document-elementFromPoint>elementFromPoint</span>(double x, double y);
sequence<<span data-anolis-spec=dom>Element</span>> <span title=dom-Document-elementsFromPoint>elementsFromPoint</span>(double x, double y);
<span>CaretPosition</span>? <span title=dom-Document-caretPositionFromPoint>caretPositionFromPoint</span>(double x, double y);
};</pre>
<p>The <dfn title=dom-Document-elementFromPoint><code>elementFromPoint(<var>x</var>, <var>y</var>)</code></dfn> method must follow these steps:
<ol>
<li><p>If either argument is negative, <var>x</var> is greater than the <span>viewport</span> width excluding the size of a rendered scroll bar (if any), or
<var>y</var> is greater than the <span>viewport</span> height excluding the size of a rendered scroll bar (if any), or there is no <span>viewport</span>
associated with the document, return null and terminate these steps.
<li><p>If there is a <span>layout box</span> in the <span>viewport</span> that would be a target for hit testing at coordinates <var>x</var>,<var>y</var>,
return the associated element and terminate these steps.
<li><p>If the document has a root element, return the root element and terminate these steps.
<li><p>Return null.
</ol>
<p class=note>The <code title=dom-Document-elementFromPoint>elementFromPoint()</code> method does not necessarily return the top-most painted element. For
instance, an element can be excluded from being a target for hit testing by using the 'pointer-events' CSS property.
<p class=atrisk>The <dfn title=dom-Document-elementsFromPoint><code>elementsFromPoint(<var>x</var>, <var>y</var>)</code></dfn> method must follow these steps:
<ol>
<li><p>Let <var>sequence</var> be a new empty sequence.
<li><p>If either argument is negative, <var>x</var> is greater than the <span>viewport</span> width excluding the size of a rendered scroll bar (if any), or
<var>y</var> is greater than the <span>viewport</span> height excluding the size of a rendered scroll bar (if any), or there is no <span>viewport</span>
associated with the document, return <var>sequence</var> and terminate these steps.
<li><p>For each <span>layout box</span> in the <span>viewport</span>, in paint order, starting with the topmost box, that would be a target for hit testing at
coordinates <var>x</var>,<var>y</var> even if nothing would be overlapping it, append the associated element to <var>sequence</var>.
<li><p>If the document has a root element, and the last item in <var>sequence</var> is not the root element, append the root element to <var>sequence</var>.
<li><p>Return <var>sequence</var>.
</ol>
<p>The <dfn title=dom-Document-caretPositionFromPoint><code>caretPositionFromPoint(<var>x</var>, <var>y</var>)</code></dfn> method must return the
result of running these steps:</p>
<ol>
<li><p>If there is no <span>viewport</span> associated with the document, return null.
<li><p>If either argument is negative, <var>x</var> is greater
than the <span>viewport</span> width excluding the size of a rendered
scroll bar (if any), <var>y</var> is greather than the
<span>viewport</span> height excluding the size of a rendered scroll bar
(if any) return null.</p></li>
<li><p>If at the coordinates <var>x</var>,<var>y</var>
in the <span>viewport</span> no text insertion point indicator would have
been inserted return null.</p></li>
<li>
<p>If at the coordinates <var>x</var>,<var>y</var>
in the <span>viewport</span> a text insertion point indicator would have
been inserted in a text entry widget which is also a replaced element
return a <span>caret position</span> with its properties set as
follows:</p>
<dl>
<dt><span>caret node</span></dt>
<dd><p>The node corresponding to the text entry widget.</p></dd>
<dt><span>caret offset</span></d
6D50
t>
<dd><p>The amount of 16-bit units to the left of where the
text insertion point indicator would have inserted.</p></dd>
<dt><span>caret range</span></dt>
<dd><p>null</p></dd>
</dl>
</li>
<li>
<p>Otherwise, return a <span>caret position</span> where the
<span>caret range</span> is a collapsed
<code data-anolis-spec=dom>Range</code> object for the position
where the text insertion point indicator would have been inserted and
the other properties are set as follows:</p>
<dl>
<dt><span>caret node</span></dt>
<dd><p>The <code data-anolis-spec=dom title=dom-Range-startContainer>startContainer</code>
of the <span>caret range</span>.</p></dd>
<dt><span>caret offset</span></dt>
<dd><p>The <code data-anolis-spec=dom title=dom-Range-startOffset>startOffset</code> of
the <span>caret range</span>.</p>
</dl>
</li>
</ol>
<p class='note'>The specifics of hit testing are out of scope of this
specification and therefore the exact details of
<code title=dom-Document-elementFromPoint>elementFromPoint()</code> and
<code title=dom-Document-caretPositionFromPoint>caretPositionFromPoint()</code>
are therefore too. Hit testing will hopefully be defined in a future
revision of CSS or HTML.</p>
<h3>The <code title>CaretPosition</code> Interface</h3>
<p>A <dfn>caret position</dfn> gives the position of a text insertion point indicator. It always has an associated
<dfn>caret node</dfn>, <dfn>caret offset</dfn>, and <dfn>caret range</dfn>. It is represented by a <code>CaretPosition</code> object.</p>
<pre class=idl>interface <dfn>CaretPosition</dfn> {
readonly attribute <span data-anolis-spec=dom>Node</span> <span title=dom-CaretPosition-offsetNode>offsetNode</span>;
readonly attribute unsigned long <span title=dom-CaretPosition-offset>offset</span>;
<span>ClientRect</span>? <span title=dom-CaretPosition-getClientRect>getClientRect</span>();
};</pre>
<p>The <dfn title=dom-CaretPosition-offsetNode><code>offsetNode</code></dfn> attribute must return the <span>caret node</span>.</p>
<p>The <dfn title=dom-CaretPosition-offset><code>offset</code></dfn> attribute must return the <span>caret offset</span>.</p>
<p>The <dfn title=dom-CaretPosition-getClientRect><code>getClientRect()</code></dfn> method must follow these steps, aborting on the first step that
returns a value:</p>
<ol>
<li>
<p>If <span>caret range</span> is not null:
<ol>
<li><p>Let <var>list</var> be the result of invoking the
<code title=dom-Range-getClientRects>getClientRects()</code> method on the
range.
<li><p>If <var>list</var> is empty, return null.
<li><p>Return the <code>ClientRect</code> object in <var>list</var> at index 0.
</ol>
<li><p>If <span>caret node</span> is a text entry widget that is a replaced element,
and that is in the document, return a <code>ClientRect</code> object for the caret
in the widget as represented by the <span>caret offset</span> value.
<li><p>Return null.
</ol>
<h2>Extensions to the <code title>Element</code> Interface</h2>
<pre class=idl>partial interface <span data-anolis-spec=dom>Element</span> {
<span>ClientRectList</span> <span title=dom-Element-getClientRects>getClientRects</span>();
<span>ClientRect</span> <span title=dom-Element-getBoundingClientRect>getBoundingClientRect</span>();
void <span title=dom-Element-scrollIntoView>scrollIntoView</span>(optional boolean top = true, optional <span>ScrollOptions</span> options);
attribute (double or <span>ScrollOptions</span>) <span title=dom-Element-scrollTop>scrollTop</span>;
attribute (double or <span>ScrollOptions</span>) <span title=dom-Element-scrollLeft>scrollLeft</span>;
readonly attribute double <span title=dom-Element-scrollWidth>scrollWidth</span>;
readonly attribute double <span title=dom-Element-scrollHeight>scrollHeight</span>;
readonly attribute double <span title=dom-Element-clientTop>clientTop</span>;
readonly attribute double <span title=dom-Element-clientLeft>clientLeft</span>;
readonly attribute double <span title=dom-Element-clientWidth>clientWidth</span>;
readonly attribute double <span title=dom-Element-clientHeight>clientHeight</span>;
};</pre>
<p>The <dfn title=dom-Element-getClientRects><code>getClientRects()</code></dfn> method, when invoked, must return the result of the following algorithm:</p>
<ol>
<li><p>If the element on which it was invoked does not have an associated
<span>layout box</span> return an empty <code>ClientRectList</code> object and stop
this algorithm.</p></li>
<li><p>If the element has an associated <span>SVG layout box</span> return a
<code>ClientRectList</code> object containing a single
<code>ClientRect</code> object that describes the bounding box of the
element as defined by the SVG specification.
<span data-anolis-ref>SVG</span></li>
<li>
<p>Return a <code>ClientRectList</code> object containing a list of
<code>ClientRect</code> objects in content order describing the border
boxes (including those with a height or width of zero) with the
following constraints:</p>
<ul>
<li><p>If the element on which the method was invoked has a computed
value for the 'display' property of 'table' or
'inline-table' include both the table box and the caption
box, if any, but not the anonymous container box.</li>
<li><p>Replace each
<a href='http://www.w3.org/TR/CSS21/visuren.html#anonymous-block-level'>anonymous
block box</a> with its child box(es) and repeat this until no anonymous
block boxes are left in the final list.</li>
</ul>
</li>
</ol>
<p>The <dfn title=dom-Element-getBoundingClientRect><code>getBoundingClientRect()</code></dfn> method, when invoked, must return the result of the following
algorithm:</p>
<ol>
<li><p>Let <var>list</var> be the result of invoking
<code title=dom-Element-getClientRects>getClientRects()</code> on the
same element this method was invoked on.</p></li>
<li><p>If the <var>list</var> is empty return a <code>ClientRect</code>
object whose <code title=dom-ClientRect-top>top</code>,
<code title=dom-ClientRect-right>right</code>,
<code title=dom-ClientRect-bottom>bottom</code> and
<code title=dom-ClientRect-left>left</code> members are zero.</p></li>
<li><p>Otherwise, return a <code>ClientRect</code> object describing the
smallest rectangle that includes the first rectangle in <var>list</var>
and all of the remaining rectangles of which the height or width is not
zero.</p></li>
</ol>
<div class='example'>
<p>The following snippet gets the dimensions of the first
<code title>div</code> element in a document:</p>
<pre>var example = document.getElementsByTagName("div")[0].getBoundingClientRect();
var exampleWidth = example.width;
var exampleHeight = example.height;</pre>
</div>
<p>The <dfn title=dom-Element-scrollIntoView><code>scrollIntoView(<var>top</var>, <var>options</var>)</code></dfn> method must run these steps:</p>
<ol>
<li><p>If the element does not have any associated <span>layout box</span> terminate these steps.</p></li>
<li><p><span title='scroll an element into view'>Scroll the element into view</span> with the
<i>align to top flag</i> set if <var>top</var> is true, and the scroll behavior being the value of the <code title>behavior</code>
dictionary member of <var>options</var>.</p></li>
<li><p>Optionally perform some other action that brings the element to the user's attention.
</ol>
<p>The <dfn title=dom-Element-scrollTop><code>scrollTop</code></dfn> attribute must return the result of running these steps:</p>
<ol>
<li><p>If the element does not have any associated <span>CSS layout box</span> or the
element is the root element and the <code data-anolis-spec=dom>Document</code> is in
<span data-anolis-spec=dom title=concept-document-quirks>quirks mode</span> return zero and terminate these steps.</p></li>
<li><p>If the element is the root element return the value of
<code title='dom-Window-scrollY'>scrollY</code>.</p></li>
<li><p>If the element is <span>the HTML <code title>body</code> element</span>,
the <code data-anolis-spec=dom>Document</code> is in <span data-anolis-spec=dom title=concept-document-quirks>quirks mode</span>, and the element
does not have any overflow, return the value of
<code title=dom-Window-scrollY>scrollY</code>.</p></li>
<li><p>Return the y-coordinate of the <span>scrolling area</span> at the
alignment point with the top of the <span>padding edge</span> of the
element.</p></li>
</ol>
<p>When setting the <code title=dom-Element-scrollTop>scrollTop</code> attribute these steps must be run:</p>
<ol>
<li><p>If the given value is a <code>ScrollOptions</code> object, and the <code title>y</code> dictionary member is not present, abort these steps.
<li><p>If the given value is a <code>ScrollOptions</code> object, let <var>y</var> be the value of the <code title>y</code> dictionary member. Otherwise,
let <var>y</var> be the given value.</p></li>
<li><p>If the element does not have any associated <span>CSS layout box</span>, the
element is the root element and the <code data-anolis-spec=dom>Document</code> is in
<span data-anolis-spec=dom title=concept-document-quirks>quirks mode</span>, or the element has no associated scrolling box, or the element has no overflow,
terminate these steps.</p></li>
<li><p>If the element is the root element invoke
<code title=dom-Window-scroll>scroll()</code> with zero as first
argument and <var>y</var> as second, and, if the given value is a <code>ScrollOptions</code> object, the given value as the third argument.</p></li>
<li><p>If the element is <span>the HTML <code title>body</code> element</span>,
the <code data-anolis-spec=dom>Document</code> is in <span data-anolis-spec=dom title=concept-document-quirks>quirks mode</span>, and the element
does not have any vertical overflow, invoke
<code title=dom-Window-scroll>scroll()</code> with
<code title=dom-Window-scrollX>scrollX</code> as first
argument and <var>y</var> as second, and, if the given value is a <code>ScrollOptions</code> object, the given value as the third argument.</p></li>
<li><p><span title='scroll an element'>Scroll the element</span> to
<code title=dom-Element-scrollLeft>scrollLeft</code>,<var>y</var>, with the scroll behavior being the value of the <code title>behavior</code> dictionary
member if the given value is a <code>ScrollOptions</code> object, or <code title>auto</code> otherwise.
</ol>
<p>The <dfn title=dom-Element-scrollLeft><code>scrollLeft</code></dfn> attribute must return the result of running these steps:</p>
<ol>
<li><p>If the element does not have any associated <span>CSS layout box</span> or the
element is the root element and the <code data-anolis-spec=dom>Document</code> is in
<span data-anolis-spec=dom title=concept-document-quirks>quirks mode</span> return zero and terminate these steps.</p></li>
<li><p>If the element is the root element return the value of
<code title=dom-Window-scrollX>scrollX</code>.</p></li>
<li><p>If the element is <span>the HTML <code title>body</code> element</span>,
the <code data-anolis-spec=dom>Document</code> is in <span data-anolis-spec=dom title=concept-document-quirks>quirks mode</span>, and the element
does not have any overflow, return the value of
<code title=dom-Window-scrollX>scrollX</code>.</p></li>
<li><p>Return the x-coordinate of the <span>scrolling area</span> at the
alignment point with the left of the <span>padding edge</span> of the
element.</p></li>
</ol>
<p>When setting the <code title=dom-Element-scrollLeft>scrollLeft</code> attribute these steps must be run:</p>
<ol>
<li><p>If the given value is a <code>ScrollOptions</code> object, and the <code title>x</code> dictionary member is not present, abort these steps.
<li><p>If the given value is a <code>ScrollOptions</code> object, let <var>x</var> be the value of the <code title>x</code> dictionary member. Otherwise,
let <var>x</var> be the given value.</p></li>
<li><p>If the element does not have any associated <span>CSS layout box</span>, the
element is the root element and the <code data-anolis-spec=dom>Document</code> is in
<span data-anolis-spec=dom title=concept-document-quirks>quirks mode</span>, or the element has no associated scrolling box, or the element has no overflow,
terminate these steps.</p></li>
<li><p>If the element is the root element invoke
<code title=dom-Window-scroll>scroll()</code> with
<var>x</var> as first argument and zero as second, and, if the given value is a <code>ScrollOptions</code> object, the given value as the third
argument.</p></li>
<li><p>If the element is <span>the HTML <code title>body</code> element</span>,
the <code data-anolis-spec=dom>Document</code> is in <span data-anolis-spec=dom title=concept-document-quirks>quirks mode</span>, and the element
does not have any vertical overflow, invoke
<code title='dom-Window-scroll'>scroll()</code> with
<var>x</var> as first argument and
<code title=dom-Window-scrollY>scrollY</code> as second, and, if the given value is a <code>ScrollOptions</code> object, the given value as the third
argument.</p></li>
<li><p><span title='Scroll an element'>Scroll the element</span> to
<var>x</var>,<code title=dom-Element-scrollTop>scrollTop</code>, with the scroll behavior being the value of the <code title>behavior</code> dictionary
member if the given value is a <code>ScrollOptions</code> object, or <code title>auto</code> otherwise.
</ol>
<p>The <dfn title=dom-Element-scrollWidth><code>scrollWidth</code></dfn> attribute must return the result of running these steps:</p>
<ol>
<li><p>If the element does not have any associated <span>CSS layout box</span> return
zero and terminate these steps.</p></li>
<li><p>Let <var>viewport width</var> be the width of the <span>viewport</span> excluding the width of the scroll bar, if any, or zero if there is no
<span>viewport</span>.
<li><p>If the element is the root element and the
<code data-anolis-spec=dom>Document</code> is not in
<span data-anolis-spec=dom title=concept-document-quirks>quirks mode</span>
return max(<span>viewport</span> <span>scrolling area</span> width, <var>viewport width</var>).</p></li>
<li><p>If the element is <span>the HTML <cod
64C6
e title>body</code> element</span>
and the <code data-anolis-spec=dom>Document</code> is in
<span data-anolis-spec=dom title=concept-document-quirks>quirks mode</span>
return max(<span>viewport</span> <span>scrolling area</span> width, <var>viewport width</var>).</p></li>
<li><p>Return the width of the element's <span>scrolling area</span>.</p></li>
</ol>
<p>The <dfn title=dom-Element-scrollHeight><code>scrollHeight</code></dfn> attribute must return the result of running these steps:</p>
<ol>
<li><p>If the element does not have any associated <span>CSS layout box</span> return
zero and terminate these steps.</p></li>
<li><p>Let <var>viewport height</var> be the height of the <span>viewport</span> excluding the height of the scroll bar, if any, or zero if there is no
<span>viewport</span>.
<li><p>If the element is the root element and the
<code data-anolis-spec=dom>Document</code> is not in
<span data-anolis-spec=dom title=concept-document-quirks>quirks mode</span>
return max(<span>viewport</span> <span>scrolling area</span> height, <var>viewport height</var>).</p></li>
<li><p>If the element is <span>the HTML <code title>body</code> element</span>
and the <code data-anolis-spec=dom>Document</code> is in
<span data-anolis-spec=dom title=concept-document-quirks>quirks mode</span>
return max(<span>viewport</span> <span>scrolling area</span> height, <var>viewport height</var>).</p></li>
<li><p>Return the height of the element's <span>scrolling area</span>.</p></li>
</ol>
<p>The <dfn title=dom-Element-clientTop><code>clientTop</code></dfn> attribute must run these steps:
<ol>
<li><p>If the element has no associated <span>CSS layout box</span> or if the <span>CSS layout box</span> is inline, return zero.
<li><p>Return the computed value of the 'border-top-width' property plus the height of any scrollbar rendered between the top <span>padding
edge</span> and the top <span>border edge</span>.
</ol>
<p>The <dfn title=dom-Element-clientLeft><code>clientLeft</code></dfn> attribute must run these steps:
<ol>
<li><p>If the element has no associated <span>CSS layout box</span> or if the <span>CSS layout box</span> is inline, return zero.
<li><p>Return the computed value of the 'border-left-width' property plus the width of any scrollbar rendered between the left <span>padding
edge</span> and the left <span>border edge</span>.
</ol>
<p>The <dfn title=dom-Element-clientWidth><code>clientWidth</code></dfn> attribute must run these steps:
<ol>
<li><p>If the element has no associated <span>CSS layout box</span> or if the <span>CSS layout box</span> is inline, return zero.
<li><p>If the element is the root element and the element's document's <span data-anolis-spec=html>browsing context</span> is a
<span data-anolis-spec=html>top-level browsing context</span>, return the <span>viewport</span> width excluding the size of a rendered scroll bar (if
any).
<li><p>Return the width of the <span>padding edge</span> excluding the width of any rendered scrollbar between the <span>padding edge</span> and the