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
|
<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=1508420
-->
<head>
<meta charset="utf-8">
<title>
Test for Bug 1508420: Cases where a frame isn't allowed to be a dynamic
reflow root
</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script src="/tests/SimpleTest/WindowSnapshot.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body onload="main()">
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1508420">Mozilla Bug 1508420</a>
<p id="display">
<!-- Here's the iframe that we'll do all of our testing/snapshotting in: -->
<iframe srcdoc="<!DOCTYPE html><body></body>"></iframe>
</p>
<script type="application/javascript">
/** Test for Bug 1508420 **/
/**
* This test exercises various cases where we exclude a frame from being
* flagged as a dynamic reflow root. (We prevent this because we know that
* there are cases where we'd produce incorrect layout if we initiated reflow
* from the frame in question.)
*
* Roughly, the idea in each subtest here is to do the following:
* 1) Set up a scenario with some condition that we think should prevent a
* particular frame from being flagged as a dynamic reflow root.
* 2) Make a dynamic tweak that we expect would result in broken layout, if
* we had allowed the frame in question to be a dynamic reflow root.
* Take a snapshot.
* 3) Force a full reconstruct + reflow of the document's frames (by
* toggling "display:none" on the root element). Take another snapshot.
* 4) Assert that snapshots look the same -- i.e. that our incremental
* reflow didn't produce the wrong layout.
*
* Ideally, every condition in ReflowInput::InitDynamicReflowRoot()
* should have a corresponding subtest here (and the subtest should fail if
* we remove the condition from InitDynamicReflowRoot).
*/
// Styles that are sufficient to make a typical element into a reflow root.
// We apply these styles to "reflow root candidates" throughout this test
// (and then add other styles that should make the candidate ineligible,
// typically).
const gReflowRootCandidateStyles =
"display: flow-root; will-change: transform; width: 10px; height: 10px;";
// Some convenience globals for the document inside the iframe:
// (initialized in 'main' after the iframe gets a chance to load)
// --------------------------------------------------------------
let gFWindow;
let gFDoc;
let gFBody;
// Some utility functions used in each test function:
// --------------------------------------------------
function createStyledDiv(divStyleStr, divInnerText) {
let div = gFDoc.createElement("div");
div.style.cssText = divStyleStr;
if (typeof divInnerText !== "undefined") {
div.innerText = divInnerText;
}
return div;
}
// This function takes an initial snapshot, then a second snapshot after
// invoking the given tweakFunc, and finally a third after forcing the frame
// tree to be reconstructed from scratch. Then it compares the snapshots to
// validate that the tweak did produce a visible change, & that the
// after-tweak rendering looks the same in the last two snapshots.
function tweakAndCompareSnapshots(tweakFunc, descPrefix) {
let snapPreTweak = snapshotWindow(gFWindow, false);
let descPreTweak = descPrefix + "-initial-rendering";
// Now we invoke the tweak (changing the size of some content inside the
// reflow root candidate). If this influences the size of the candidate
// itself, and we fail to do any reflow outside of the candidate because
// we made it a reflow root, then we expect to end up with a broken layout
// due to a parent or sibling not having been resized/repositioned.
// We'll discover that when comparing snapIncReflow against snapFullReflow
// below.
tweakFunc();
let snapIncReflow = snapshotWindow(gFWindow, false);
let descIncReflow = descPrefix + "-after-tweak-inc-reflow";
// Now we trigger a "full" reflow (not incremental), by forcing
// frame reconstruction all the way from the body element. This should
// force us to reflow from the actual document root, even if we have
// promoted any frames to be dynamic reflow roots.
gFBody.style.display = "none";
gFBody.offsetTop; // flush layout
gFBody.style.display = "";
let snapFullReflow = snapshotWindow(gFWindow, false);
let descFullReflow = descPrefix + "-after-tweak-full-reflow";
assertSnapshots(snapIncReflow, snapPreTweak, false, null,
descIncReflow, descPreTweak);
assertSnapshots(snapIncReflow, snapFullReflow, true, null,
descIncReflow, descFullReflow);
}
// Test functions (called from "main"), with a subtest array in most cases:
// ------------------------------------------------------------------------
// Subtests for intrinsic size keywords (and equivalent, e.g. percentages) as
// values for width/height/{min,max}-{width,height} on reflow root candidates:
let intrinsicSizeSubtests = [
{ desc: "width-auto",
candStyle: "width:auto",
},
{ desc: "width-pct",
candStyle: "width:80%",
},
{ desc: "width-calc-pct",
candStyle: "width:calc(10px + 80%)",
},
{ desc: "width-min-content",
candStyle: "width:-moz-min-content; width:min-content;",
},
{ desc: "width-max-content",
candStyle: "width:-moz-max-content; width:max-content;",
},
{ desc: "min-width-min-content",
candStyle: "min-width:-moz-min-content; min-width:min-content;",
},
{ desc: "min-width-max-content",
candStyle: "min-width:-moz-max-content; min-width:max-content;",
},
{ desc: "max-width-min-content",
// Note: hardcoded 'width' here must be larger than what 'inner'
// gets resized to, so that max-width gets a chance to clamp.
candStyle: "width: 50px; \
max-width:-moz-min-content; max-width:min-content;",
},
{ desc: "max-width-max-content",
candStyle: "width: 50px; \
max-width:-moz-max-content; max-width:max-content;",
},
{ desc: "height-auto",
candStyle: "height:auto",
},
{ desc: "height-pct",
candStyle: "height:80%",
},
{ desc: "height-calc-pct",
candStyle: "height:calc(10px + 80%)",
},
{ desc: "height-min-content",
candStyle: "height:-moz-min-content; height:min-content;",
},
{ desc: "height-max-content",
candStyle: "height:-moz-max-content; height:max-content;",
},
{ desc: "min-height-min-content",
candStyle: "min-height:-moz-min-content; min-height:min-content;",
},
{ desc: "min-height-max-content",
candStyle: "min-height:-moz-max-content; min-height:max-content;",
},
{ desc: "max-height-min-content",
// Note: hardcoded 'height' here must be larger than what 'inner'
// gets resized to, so that max-height gets a chance to clamp.
candStyle: "height: 50px; \
max-height:-moz-min-content; max-height:min-content;",
},
{ desc: "max-height-max-content",
candStyle: "height: 50px; \
max-height:-moz-max-content; max-height:max-content;",
},
];
// Intrinsic heights (e.g. 'height:auto') should prevent
// an element from being a reflow root.
function runIntrinsicSizeSubtest(subtest) {
// Run each testcase in horizontal & vertical writing mode:
for (let wmVal of ["horizontal-tb", "vertical-lr"]) {
gFBody.style.writingMode = wmVal;
// Short version of WM, for use in logging for snapshot comparison below:
let wmDesc = (wmVal == "horizontal-tb" ? "-horizWM" : "-vertWM");
// This outer div is intrinsically sized, and it needs to be reflowed
// when the size of its child (the reflow root candidate) changes.
let outer = createStyledDiv("border: 2px solid teal; \
inline-size: -moz-max-content; \
inline-size: max-content");
// The reflow root candidate:
let cand = createStyledDiv(gReflowRootCandidateStyles +
subtest.candStyle);
// Something whose size we can adjust, inside the reflow root candidate:
let inner = createStyledDiv("height:20px; width:20px; \
border: 1px solid purple");
cand.appendChild(inner);
outer.appendChild(cand);
gFBody.appendChild(outer);
let tweakFunc = function() {
inner.style.width = inner.style.height = "40px";
};
tweakAndCompareSnapshots(tweakFunc, subtest.desc + wmDesc);
// clean up
outer.remove();
gFBody.style.writingMode = "";
}
}
let flexItemSubtests = [
{ desc: "flex-basis-content",
candStyle: "flex-basis:content;",
},
{ desc: "flex-basis-min-content",
candStyle: "flex-basis:-moz-min-content;flex-basis:min-content;",
},
{ desc: "flex-basis-auto-width-auto",
candStyle: "flex-basis:auto;width:auto;",
},
// For percent flex-basis, we're concerned with cases where the percent
// triggers content-based sizing during the flex container's intrinsic
// sizing step. So we need to get the container to be intrinsically sized;
// hence the use of the (optional) "isContainerIntrinsicallySized" flag.
// FIXME(bug 1548078): the following two tests fail to produce a rendering difference:
// { desc: "flex-basis-pct",
// candStyle: "flex-basis:80%;",
// isContainerIntrinsicallySized: true,
// },
// { desc: "flex-basis-calc-pct",
// candStyle: "flex-basis:calc(10px + 80%);",
// isContainerIntrinsicallySized: true,
// },
{ desc: "flex-basis-from-pct-isize",
candStyle: "inline-size:80%",
isContainerIntrinsicallySized: true,
},
{ desc: "flex-basis-from-calc-pct-isize",
candStyle: "inline-size:calc(10px + 80%);",
isContainerIntrinsicallySized: true,
},
// Testing the magic "min-main-size:auto" keyword
// and other intrinsic min/max sizes
{ desc: "flex-min-inline-size-auto",
candStyle: "flex:0 5px; inline-size:auto; min-inline-size:auto",
},
{ desc: "flex-min-inline-size-min-content",
candStyle: "flex:0 5px; inline-size:auto; min-inline-size:min-content",
},
{ desc: "flex-min-block-size-auto",
candStyle: "flex:0 5px; block-size:auto; min-block-size:auto",
isContainerColumnOriented: true,
},
{ desc: "flex-min-block-size-auto",
candStyle: "flex:0 5px; block-size:auto; min-block-size:min-content",
isContainerColumnOriented: true,
},
];
// Content-dependent flex-basis values should prevent a flex item
// from being a reflow root.
function runFlexItemSubtest(subtest) {
// We create a flex container with two flex items:
// - a simple flex item that just absorbs all extra space
// - the reflow root candidate
let containerSizeVal = subtest.isContainerIntrinsicallySized ?
"max-content" : "100px";
let containerSizeDecl =
"inline-size: " + containerSizeVal + "; " +
"block-size: " + containerSizeVal + ";";
let containerFlexDirectionDecl = "flex-direction: " +
(subtest.isContainerColumnOriented ? "column" : "row") + ";"
let flexContainer = createStyledDiv("display: flex; \
border: 2px solid teal; " +
containerSizeDecl +
containerFlexDirectionDecl);
let simpleItem = createStyledDiv("border: 1px solid gray; \
background: yellow; \
min-inline-size: 10px; \
flex: 1");
// The reflow root candidate
// (Note that we use min-width:0/min-height:0 by default, but subtests
// might override that with other values in 'candStyle'.)
let cand = createStyledDiv(gReflowRootCandidateStyles +
" min-width: 0; min-height: 0; " +
subtest.candStyle);
// Something whose size we can adjust, inside the reflow root candidate:
let inner = createStyledDiv("height:20px; width:20px");
cand.appendChild(inner);
flexContainer.appendChild(simpleItem);
flexContainer.appendChild(cand);
gFBody.appendChild(flexContainer);
let tweakFunc = function() {
inner.style.width = inner.style.height = "40px";
};
tweakAndCompareSnapshots(tweakFunc, subtest.desc);
flexContainer.remove(); // clean up
}
let gridItemSubtests = [
{ desc: "grid-pct-inline-isize",
candStyle: "inline-size:80%",
isContainerIntrinsicallySized: true,
},
{ desc: "grid-calc-pct-inline-isize",
candStyle: "inline-size:calc(10px + 80%);",
isContainerIntrinsicallySized: true,
},
{ desc: "grid-min-inline-size-min-content",
candStyle: "min-inline-size:min-content",
},
];
// 'auto' and intrinsic size keywords on some properties should prevent
// a grid item from becoming a reflow root.
function runGridItemSubtest(subtest) {
// We create a 4x4 grid container with two grid items:
// - a simple grid item that just absorbs all extra space
// - the reflow root candidate
let containerSizeVal = subtest.isContainerIntrinsicallySized ?
"max-content" : "100px";
let containerSizeDecl =
"inline-size: " + containerSizeVal + "; " +
"block-size: " + containerSizeVal + ";";
let containerGridDirectionDecl = "grid-auto-flow: " +
(subtest.isContainerColumnOriented ? "column" : "row") + ";"
let gridContainer = createStyledDiv("display: grid; \
grid: 1fr auto / 1fr auto; \
border: 2px solid teal; " +
containerSizeDecl +
containerGridDirectionDecl);
let simpleItem = createStyledDiv("border: 1px solid gray; \
background: yellow;");
// The reflow root candidate
let cand = createStyledDiv(gReflowRootCandidateStyles +
"background: blue; " +
"grid-area:2/2; " +
"min-width: 10px; min-height: 10px; " +
subtest.candStyle);
// Something whose size we can adjust, inside the reflow root candidate:
let inner = createStyledDiv("height:20px; width:20px;");
cand.appendChild(inner);
gridContainer.appendChild(simpleItem);
gridContainer.appendChild(cand);
gFBody.appendChild(gridContainer);
let tweakFunc = function() {
inner.style.width = inner.style.height = "40px";
};
tweakAndCompareSnapshots(tweakFunc, subtest.desc);
gridContainer.remove(); // clean up
}
let gridContainerSubtests = [
{ desc: "grid-column-start",
candStyle: "grid-column-start:2",
},
{ desc: "grid-column-end",
candStyle: "grid-column-end:3",
},
{ desc: "grid-row-start",
candStyle: "grid-row-start:2",
},
{ desc: "grid-row-end",
candStyle: "grid-row-end:3",
},
];
// Test that changes to grid item properties that affect grid container
// layout causes a grid container reflow when the item is a reflow root.
function runGridContainerSubtest(subtest) {
// We create a 4x4 grid container with one grid item:
// - a reflow root grid item that we'll tweak from
// the list above. By default it's placed at 1,1
// but after the tweak it should be placed elsewhere
let gridContainer = createStyledDiv("display: grid; \
width: 100px; \
height: 100px; \
grid: 1fr 10px / 1fr 10px; \
border: 2px solid teal");
// The reflow root candidate
let cand = createStyledDiv(gReflowRootCandidateStyles +
"background: blue; " +
" min-width: 10px; min-height: 10px; ");
gridContainer.appendChild(cand);
gFBody.appendChild(gridContainer);
let tweakFunc = function() {
cand.style.cssText += "; " + subtest.candStyle;
};
tweakAndCompareSnapshots(tweakFunc, subtest.desc);
gridContainer.remove(); // clean up
}
let gridSubgridSubtests = [
{ desc: "subgrid",
candStyle: "grid: subgrid / subgrid",
},
{ desc: "subgrid-rows",
candStyle: "grid: subgrid / 20px",
},
{ desc: "subgrid-columns",
candStyle: "grid: 20px / subgrid",
},
];
// Test that a subgrid is not a reflow root.
function runGridSubgridSubtest(subtest) {
// We create a 4x4 grid container a with one grid item:
// - a reflow root display:grid that we'll style as a subgrid from
// the list above. We place an item inside it that we'll tweak
// the size of, which should affect the outer grid track sizes.
let gridContainer = createStyledDiv("display: grid; \
width: 100px; \
height: 100px; \
grid: 1fr auto / 1fr auto; \
border: 2px solid teal");
// The reflow root candidate
let cand = createStyledDiv(gReflowRootCandidateStyles +
"display: grid;" +
"grid-area: 2/2;" +
"background: blue;" +
"min-width: 10px; min-height: 10px;" +
subtest.candStyle);
// Something whose size we can adjust, inside the subgrid:
let inner = createStyledDiv("height:20px; width:20px;");
cand.appendChild(inner);
gridContainer.appendChild(cand);
gFBody.appendChild(gridContainer);
let tweakFunc = function() {
inner.style.width = inner.style.height = "40px";
};
tweakAndCompareSnapshots(tweakFunc, subtest.desc);
gridContainer.remove(); // clean up
}
let tableSubtests = [
{ desc: "table",
/* Testing the default "display:table" styling that runTableTest uses: */
candStyle: "",
},
{ desc: "inline-table",
candStyle: "display:inline-table;",
},
{ desc: "table-caption",
candStyle: "display:table-caption;",
},
{ desc: "table-cell",
candStyle: "display:table-cell;",
},
{ desc: "table-column",
candStyle: "display:table-column;",
isColumn: true,
},
{ desc: "table-column-group",
candStyle: "display:table-column-group;",
isColumn: true,
},
{ desc: "table-row",
candStyle: "display:table-row;",
},
{ desc: "table-row-group",
candStyle: "display:table-row-group;",
},
];
function runTableSubtest(subtest) {
let outer = createStyledDiv("");
let shrinkWrapIB = createStyledDiv("display: inline-block; \
border: 2px solid teal");
let cand = createStyledDiv("display: table; \
width: 1px; height: 1px; \
will-change: transform; \
border: 1px solid purple;" +
subtest.candStyle);
let inner = createStyledDiv("display: block; \
width: 10px; height: 10px; \
background: pink;");
if (subtest.isColumn) {
// The candidate is a table-column / table-column-group, so
// the inner content that we tweak shouldn't be inside of it.
// Create an explicit table, separately, and put the candidate
// (the column/column-group) and the tweakable inner element
// both inside of that explicit table.
let table = createStyledDiv("display: table");
table.appendChild(inner);
table.appendChild(cand);
shrinkWrapIB.appendChild(table);
} else {
// The candidate is a table or some other table part
// that can hold content. Just put the tweakable inner
// element directly inside of it, and let anonymous table parts
// be generated as-needed.
cand.appendChild(inner);
shrinkWrapIB.appendChild(cand);
}
outer.appendChild(gFDoc.createTextNode("a"));
outer.appendChild(shrinkWrapIB);
gFBody.appendChild(outer);
let tweakFunc = function() {
inner.style.width = inner.style.height = "40px";
};
tweakAndCompareSnapshots(tweakFunc, subtest.desc);
outer.remove(); // clean up
}
let inlineSubtests = [
{ desc: "inline",
candStyle: "display:inline",
},
];
function runInlineSubtest(subtest) {
let outer = createStyledDiv("");
let shrinkWrapIB = createStyledDiv("display: inline-block; \
border: 2px solid teal");
let cand = createStyledDiv(gReflowRootCandidateStyles +
subtest.candStyle);
let inner = createStyledDiv("display: inline-block; \
width: 20px; height: 20px; \
background: pink;");
cand.appendChild(inner);
shrinkWrapIB.appendChild(cand);
outer.appendChild(gFDoc.createTextNode("a"));
outer.appendChild(shrinkWrapIB);
gFBody.appendChild(outer);
let tweakFunc = function() {
inner.style.width = inner.style.height = "40px";
};
tweakAndCompareSnapshots(tweakFunc, subtest.desc);
outer.remove(); // clean up
}
let rubySubtests = [
{ desc: "ruby",
candStyle: "display:ruby",
},
{ desc: "ruby-base",
candStyle: "display:ruby-base",
},
{ desc: "ruby-base-container",
candStyle: "display:ruby-base-container",
},
{ desc: "ruby-text",
candStyle: "display:ruby-text",
},
{ desc: "ruby-text-container",
candStyle: "display:ruby-text-container",
},
];
function runRubySubtest(subtest) {
let outer = createStyledDiv("");
let shrinkWrapIB = createStyledDiv("display: inline-block; \
border: 2px solid teal");
let cand = createStyledDiv(gReflowRootCandidateStyles +
subtest.candStyle);
let inner = createStyledDiv("display: inline-block; \
width: 20px; height: 20px; \
background: pink;");
cand.appendChild(inner);
shrinkWrapIB.appendChild(cand);
outer.appendChild(gFDoc.createTextNode("a"));
outer.appendChild(shrinkWrapIB);
gFBody.appendChild(outer);
let tweakFunc = function() {
inner.style.width = inner.style.height = "40px";
};
tweakAndCompareSnapshots(tweakFunc, subtest.desc);
outer.remove(); // clean up
}
function runFixedPosTest() {
// We reset the 'will-change' value on the candidate (overriding
// 'will-change:transform'), so that it won't be a fixed-pos CB. We also
// give the candidate some margins to shift it away from the origin, to
// make it visually clearer that its child's fixed-pos offsets are being
// resolved against the viewport rather than against the candidate div.
let cand = createStyledDiv(gReflowRootCandidateStyles +
"will-change: initial; \
margin: 20px 0 0 30px; \
border: 2px solid black;");
let inner = createStyledDiv("height: 20px; width: 20px; \
background: pink;");
let fixedPos = createStyledDiv("position: fixed; \
width: 10px; height: 10px; \
background: gray;");
cand.appendChild(inner);
cand.appendChild(fixedPos);
gFBody.appendChild(cand);
// For our tweak, we'll adjust the size of "inner". This change impacts
// the position of the "fixedPos" placeholder (specifically, its static
// position), so this will require an incremental reflow that is rooted at
// the viewport (the containing block of "fixedPos") in order to produce
// the correct final layout. This is why "cand" isn't allowed to be a
// reflow root.
let tweakFunc = function() {
inner.style.width = inner.style.height = "40px";
};
tweakAndCompareSnapshots(tweakFunc, "fixed-pos");
cand.remove(); // clean up
}
function runMarginCollapseTest() {
let outer = createStyledDiv("background: lime");
// We use 'display:block' on the candidate (overriding 'display:flow-root')
// so that it won't be a block formatting context. (See usage/definition of
// NS_BLOCK_FORMATTING_CONTEXT_STATE_BITS in our c++ layout code.)
let cand = createStyledDiv(gReflowRootCandidateStyles +
"display: block; \
background: purple;");
// We'll add border to this div in the "tweak" function, which will break
// the stack of margin collapsed divs.
let divWithEventualBorder = createStyledDiv("");
let divWithMargin = createStyledDiv("margin-top: 30px; \
width: 10px; height: 10px; \
background: pink;");
divWithEventualBorder.appendChild(divWithMargin);
cand.appendChild(divWithEventualBorder);
outer.appendChild(cand);
gFBody.appendChild(outer);
// For our tweak, we'll add a border around "divWithEventualBorder", which
// prevents the margin (on "divWithMargin") from collapsing all the way up
// to the outermost div wrapper (which it does, before the tweak).
// So: this tweak effectively moves the y-position towards 0, for all
// div wrappers outside the new border. This includes "outer", the parent
// of our reflow root candidate. So: if we mistakenly allow "cand" to be a
// reflow root, then we probably would neglect to adjust the position of
// "outer" when reacting to this tweak (and we'd catch that & report a
// test failure in our screenshot comparisons below).
let tweakFunc = function() {
divWithEventualBorder.style.border = "2px solid black";
};
tweakAndCompareSnapshots(tweakFunc, "margin-uncollapse");
outer.remove(); // clean up
}
function runFloatTest() {
let outer = createStyledDiv("");
// We use 'display:block' on the candidate (overriding 'display:flow-root')
// so that it won't be a block formatting context. (See usage/definition of
// NS_BLOCK_FORMATTING_CONTEXT_STATE_BITS in our c++ layout code.)
// This allows floats inside the candidate to affect the position of
// inline-level content outside of it.
let cand = createStyledDiv(gReflowRootCandidateStyles +
"display: block; \
border: 2px solid black;");
let floatChild = createStyledDiv("float: left; \
width: 60px; height: 60px; \
background: pink;");
let inlineBlock = createStyledDiv("display: inline-block; \
width: 80px; height: 80px; \
background: teal");
cand.appendChild(floatChild);
outer.appendChild(cand);
outer.appendChild(inlineBlock);
gFBody.appendChild(outer);
let tweakFunc = function() {
floatChild.style.width = floatChild.style.height = "40px";
};
tweakAndCompareSnapshots(tweakFunc, "float");
outer.remove(); // clean up
}
function main() {
SimpleTest.waitForExplicitFinish();
// Initialize our convenience aliases:
gFWindow = frames[0].window;
gFDoc = frames[0].document;
gFBody = frames[0].document.body;
for (let subtest of intrinsicSizeSubtests) {
runIntrinsicSizeSubtest(subtest);
}
for (let subtest of flexItemSubtests) {
runFlexItemSubtest(subtest);
}
for (let subtest of gridContainerSubtests) {
runGridContainerSubtest(subtest);
}
for (let subtest of gridSubgridSubtests) {
runGridSubgridSubtest(subtest);
}
for (let subtest of gridItemSubtests) {
runGridItemSubtest(subtest);
}
for (let subtest of tableSubtests) {
runTableSubtest(subtest);
}
for (let subtest of inlineSubtests) {
runInlineSubtest(subtest);
}
for (let subtest of rubySubtests) {
runRubySubtest(subtest);
}
runFixedPosTest();
runMarginCollapseTest();
runFloatTest();
SimpleTest.finish();
}
</script>
</body>
</html>
|
