[LBSE] Fix/enable zooming & panning - improve interop

https://bugs.webkit.org/show_bug.cgi?id=245507

Reviewed by Rob Buis.

Zooming/panning is entirely broken and unprecdictable if LBSE is activated.
It often shows no immediate effect, or painting artefacts upon scrolling.

Fix panning by implementing RenderSVGRoot::updateFromElement() and using
it from SVGSVGElement::updateCurrentTranslate() to request pan updates.
Forward updateFromElement() calls to the viewportContainer() (the anonymous
RenderSVGViewportContainer wrapping the rest of the SVG render tree) to
update the layer transform.

Enforce 'HasSVGTransform' flag to be set on thew viewportContainer() if
it gained a SVG transform due to full page zoom or panning. It only used
to work if other means caused the flag to be set (e.g. viewBox transform).

This also improves interop with Blink/Gecko, resolving a 15+ year old issue.
SVGs with relative sized width/height cannot be zoomed (stroke-width enlarges,
but document stays at the same size, scrollbars never appear).
RenderSVGRoot::computeReplacedLogicalWidth() now multiples the result by the
effectiveZoom() if the document has no intrinsic width (e.g. % units!).
Likewise computeReplacedLogicalHeight() now also respects the zoom.

The other code paths in computeReplacedLogicalWidh() already implicitely took the
zoom into account, e.g. if isEmbeddedThroughFrameContainingSVGDocument() = true, the
containingBlock() availableLogicalWidth() is returned. These kind of CSS values are
multiplied by the effectiveZoom() by default during Length resolving, whereas SVG elements
don't - see Style::BuilderState::useSVGZoomRulesForLength. This is correct for the whole
SVG subtree, since the effectiveZoom() induced scaling is realized by applying a transform
to the outermost RenderSVGViewportContainer layer, not by scaling individual length values.

This PR fixes all page zoom / panning / .. issues in LBSE.
Covered by various existing tests (see TestExpectations changes).

* LayoutTests/platform/mac-monterey-wk2-lbse-text/TestExpectations:
* LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/custom/pan-direction-expected.txt: Added.
* LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/absolute-sized-document-no-scrollbars-expected.txt: Added.
* LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/absolute-sized-document-scrollbars-expected.txt: Added.
* LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/relative-sized-document-scrollbars-expected.png: Added.
* LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/relative-sized-document-scrollbars-expected.txt: Added.
* LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/zoom-coords-viewattr-01-b-expected.png: Added.
* LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/zoom-coords-viewattr-01-b-expected.txt: Added.
* LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/zoom-foreign-content-expected.png: Added.
* LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/zoom-foreign-content-expected.txt: Added.
* LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/zoom-foreignObject-expected.png: Added.
* LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/zoom-foreignObject-expected.txt: Added.
* LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/zoom-hixie-mixed-008-expected.png: Added.
* LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/zoom-hixie-mixed-008-expected.txt: Added.
* LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/zoom-hixie-mixed-009-expected.png: Added.
* LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/zoom-hixie-mixed-009-expected.txt: Added.
* LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/zoom-hixie-rendering-model-004-expected.png: Added.
* LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/zoom-hixie-rendering-model-004-expected.txt: Added.
* LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/zoom-img-preserveAspectRatio-support-1-expected.txt: Added.
* LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/zoom-replaced-intrinsic-ratio-001-expected.txt: Added.
* LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/zoom-svg-as-object-expected.txt: Added.
* LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/zoom-svg-float-border-padding-expected.png: Added.
* LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/zoom-svg-float-border-padding-expected.txt: Added.
* LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/zoom-svg-through-object-with-absolute-size-2-expected.txt: Added.
* LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/zoom-svg-through-object-with-auto-size-expected.txt: Added.
* LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/zoom-svg-through-object-with-override-size-expected.txt: Added.
* LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/text/zoom-hixie-mixed-008-expected.png: Added.
* Source/WebCore/rendering/svg/RenderSVGRoot.cpp:
(WebCore::RenderSVGRoot::computeReplacedLogicalWidth const):
(WebCore::RenderSVGRoot::computeReplacedLogicalHeight const):
(WebCore::RenderSVGRoot::updateLayoutSizeIfNeeded):
(WebCore::RenderSVGRoot::updateFromElement):
(WebCore::RenderSVGRoot::updateFromStyle):
(WebCore::RenderSVGRoot::computeViewportSize const):
(WebCore::RenderSVGRoot::overflowClipRect const):
* Source/WebCore/rendering/svg/RenderSVGRoot.h:
* Source/WebCore/rendering/svg/RenderSVGViewportContainer.cpp:
(WebCore::RenderSVGViewportContainer::updateLayoutSizeIfNeeded):
(WebCore::RenderSVGViewportContainer::needsHasSVGTransformFlag const):
(WebCore::RenderSVGViewportContainer::updateFromStyle):
(WebCore::RenderSVGViewportContainer::updateLayerTransform):
* Source/WebCore/rendering/svg/RenderSVGViewportContainer.h:
* Source/WebCore/svg/SVGSVGElement.cpp:
(WebCore::SVGSVGElement::updateCurrentTranslate):

Canonical link: https://commits.webkit.org/255727@main

LayoutTests/platform/mac-monterey-wk2-lbse-text/TestExpectations

@@ -70,6 +70,7 @@ svg/filters/feConvolveMatrix-negative-orderX.svg
 svg/filters/feConvolveMatrix-negative-orderY.svg                                       [ ImageOnlyFailure ]
 svg/filters/feConvolveMatrix-non-integral-order.svg                                    [ ImageOnlyFailure ]
 svg/filters/feConvolveMatrix-zero-divisor.svg                                          [ ImageOnlyFailure ]
+svg/filters/feDiffuseLighting-bottomRightPixel.html                                    [ ImageOnlyFailure ]
 svg/filters/feDiffuseLighting-fePointLight-primitiveUnits-objectBoundingBox.svg        [ ImageOnlyFailure ]
 svg/filters/feDiffuseLighting-feSpotLight-dynamic-update.svg                           [ ImageOnlyFailure ]
 svg/filters/feDiffuseLighting-feSpotLight-primitiveUnits-objectBoundingBox.svg         [ ImageOnlyFailure ]
@@ -182,10 +183,11 @@ svg/paint-order/paint-order-stroke-marker.svg     [ ImageOnlyFailure ]
 svg/paint-order/paint-order-stroke.svg            [ ImageOnlyFailure ]
 
 # SVGImage support incomplete
-svg/as-image/image-respects-pageScaleFactor-change.html [ ImageOnlyFailure ]
-svg/as-image/same-image-two-instances.html              [ ImageOnlyFailure ]
-svg/as-image/svg-as-image-with-relative-size.html       [ ImageOnlyFailure ]
-svg/custom/use-image-in-g.svg                           [ ImageOnlyFailure ]
+svg/as-image/image-respects-pageScaleFactor-change.html   [ ImageOnlyFailure ]
+svg/as-image/same-image-two-instances.html                [ ImageOnlyFailure ]
+svg/as-image/svg-as-image-with-relative-size.html         [ ImageOnlyFailure ]
+svg/custom/use-image-in-g.svg                             [ ImageOnlyFailure ]
+svg/zoom/page/zoom-img-preserveAspectRatio-support-1.html [ ImageOnlyFailure ]
 
 # SVG document w/o viewBox + <img> sizing differs to FF/Chrome
 svg/as-background-image/background-image-preserveaspectRatio-support.html [ ImageOnlyFailure ]
@@ -218,31 +220,10 @@ svg/zoom/page/zoom-zoom-coords.xhtml                        [ Failure ]
 # General repainting issue
 svg/custom/js-repaint-rect-on-path-with-stroke.svg [ Failure ]
 
-# Panning issues
-svg/custom/pan-direction.svg [ Failure ]
-
 # General placement issue with foreignObject (HTML renderers at different position than in legacy, due to LayoutUnit transition)
 # Affects all tests in svg/dynamic-updates... need to fix the underlying issue first with top priority, to enable these tests too.
 svg/dynamic-updates [ Skip ]
 
-# Page zoom issues
-svg/zoom/page/absolute-sized-document-no-scrollbars.svg          [ Failure ]
-svg/zoom/page/absolute-sized-document-scrollbars.svg             [ Failure ]
-svg/zoom/page/relative-sized-document-scrollbars.svg             [ Failure ]
-svg/zoom/page/zoom-coords-viewattr-01-b.svg                      [ Failure ]
-svg/zoom/page/zoom-foreign-content.svg                           [ Failure ]
-svg/zoom/page/zoom-foreignObject.svg                             [ Failure ]
-svg/zoom/page/zoom-hixie-mixed-008.xml                           [ Failure ]
-svg/zoom/page/zoom-hixie-mixed-009.xml                           [ Failure ]
-svg/zoom/page/zoom-hixie-rendering-model-004.xhtml               [ Failure ]
-svg/zoom/page/zoom-replaced-intrinsic-ratio-001.htm              [ Failure ]
-svg/zoom/page/zoom-svg-as-object.html                            [ Failure ]
-svg/zoom/page/zoom-svg-float-border-padding.xml                  [ Failure ]
-svg/zoom/page/zoom-svg-through-object-with-absolute-size-2.xhtml [ Failure ]
-svg/zoom/page/zoom-svg-through-object-with-auto-size.html        [ Failure ]
-svg/zoom/page/zoom-svg-through-object-with-override-size.html    [ Failure ]
-svg/zoom/text/zoom-hixie-mixed-008.xml                           [ ImageOnlyFailure ]
-
 # No gradients
 svg/W3C-SVG-1.1-SE/pservers-grad-17-b.svg                         [ ImageOnlyFailure ]
 svg/W3C-SVG-1.1-SE/pservers-grad-20-b.svg                         [ ImageOnlyFailure ]
@@ -334,6 +315,7 @@ svg/wicd/test-scalable-background-image1.xhtml                    [ ImageOnlyFai
 svg/wicd/test-scalable-background-image2.xhtml                    [ ImageOnlyFailure ]
 svg/zoom/page/zoom-background-image-tiled.html                    [ ImageOnlyFailure ]
 svg/zoom/page/zoom-svg-as-background-with-relative-size.html      [ ImageOnlyFailure ]
+svg/zoom/page/zoom-svg-through-object-with-override-size.html     [ ImageOnlyFailure ]
 
 # No patterns
 svg/W3C-SVG-1.1-SE/pservers-pattern-04-f.svg                    [ ImageOnlyFailure ]
@@ -624,7 +606,6 @@ svg/custom/object-no-size-attributes.xhtml                                    [
 svg/custom/object-sizing-no-width-height.xhtml                                [ Failure ]
 svg/custom/object-sizing.xhtml                                                [ Failure ]
 svg/wicd/sizing-flakiness.html                                                [ ImageOnlyFailure ]
-svg/zoom/page/zoom-img-preserveAspectRatio-support-1.html                     [ Failure ]
 
 # CSS 'mix-blend-mode' broken
 svg/css/mix-blend-mode-background-root.svg [ ImageOnlyFailure ]

LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/custom/pan-direction-expected.txt

@@ -0,0 +1,10 @@
+layer at (0,0) size 800x600
+  RenderView at (0,0) size 800x600
+layer at (0,0) size 800x600
+  RenderSVGRoot {svg} at (0,0) size 800x600
+layer at (0,0) size 800x600
+  RenderSVGViewportContainer at (0,0) size 800x600
+layer at (-1000,-1000) size 5000x5000 backgroundClip at (0,0) size 800x600 clip at (0,0) size 800x600
+  RenderSVGRect {rect} at (-1000,-1000) size 5000x5000 [fill={[type=SOLID] [color=#FF0000]}] [x=-1000.00] [y=-1000.00] [width=5000.00] [height=5000.00]
+layer at (50,50) size 20x20
+  RenderSVGRect {rect} at (50,50) size 20x20 [fill={[type=SOLID] [color=#008000]}] [x=50.00] [y=50.00] [width=20.00] [height=20.00]

LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/absolute-sized-document-no-scrollbars-expected.txt

@@ -0,0 +1,8 @@
+layer at (0,0) size 800x600
+  RenderView at (0,0) size 800x600
+layer at (0,0) size 576x432
+  RenderSVGRoot {svg} at (0,0) size 576x432
+layer at (0,0) size 576x432
+  RenderSVGViewportContainer at (0,0) size 576x432
+layer at (1,1) size 478x358
+  RenderSVGRect {rect} at (1,1) size 478x358 [stroke={[type=SOLID] [color=#000000]}] [x=1.00] [y=1.00] [width=478.00] [height=358.00]

LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/absolute-sized-document-scrollbars-expected.txt

@@ -0,0 +1,8 @@
+layer at (0,0) size 829x622
+  RenderView at (0,0) size 785x585
+layer at (0,0) size 829x622 scrollWidth 576 scrollHeight 432
+  RenderSVGRoot {svg} at (0,0) size 829.44x622.08
+layer at (0,0) size 830x623 backgroundClip at (0,0) size 829.44x622.08 clip at (0,0) size 829.44x622.08
+  RenderSVGViewportContainer at (0,0) size 829.44x622.08
+layer at (1,1) size 478x358
+  RenderSVGRect {rect} at (1,1) size 478x358 [stroke={[type=SOLID] [color=#000000]}] [x=1.00] [y=1.00] [width=478.00] [height=358.00]

LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/relative-sized-document-scrollbars-expected.txt

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+layer at (0,0) size 1356x1011 backgroundClip at (0,0) size 1356.47x1010.88 clip at (0,0) size 1356.47x1010.88
+  RenderView at (0,0) size 785x585
+layer at (0,0) size 1356x1011 backgroundClip at (0,0) size 1356.47x1010.88 clip at (0,0) size 1356.47x1010.88 scrollWidth 942 scrollHeight 702
+  RenderSVGRoot {svg} at (0,0) size 1356.47x1010.88
+layer at (0,0) size 1357x1011 backgroundClip at (0,0) size 1356.47x1010.88 clip at (0,0) size 1356.47x1010.88
+  RenderSVGViewportContainer at (0,0) size 1356.47x1010.88
+layer at (7.84,5.84) size 771x575
+  RenderSVGRect {rect} at (7.84,5.84) size 769.31x573.31 [stroke={[type=SOLID] [color=#000000]}] [x=7.85] [y=5.85] [width=769.29] [height=573.30]

LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/zoom-coords-viewattr-01-b-expected.txt

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+  RenderView at (0,0) size 785x585
+layer at (0,0) size 1130x842 scrollWidth 942 scrollHeight 702
+  RenderSVGRoot {svg} at (0,0) size 1130.39x842.39
+layer at (0,0) size 1131x843 backgroundClip at (0,0) size 1130.39x842.39 clip at (0,0) size 1130.39x842.39
+  RenderSVGViewportContainer at (0,0) size 1130.39x842.39
+layer at (0,-28.02) size 126x212 backgroundClip at (0,0) size 1130.39x842.39 clip at (0,0) size 1130.39x842.39
+  RenderSVGTransformableContainer {g} at (0,-28.02) size 125.55x210.27
+layer at (0,-28.02) size 126x211 backgroundClip at (0,0) size 1130.39x842.39 clip at (0,0) size 1130.39x842.39
+  RenderSVGTransformableContainer {g} at (0,0) size 125.55x210.27
+layer at (10,21.98) size 37x10
+  RenderSVGText {text} at (10,50) size 38x11 contains 1 chunk(s)
+    RenderSVGInlineText {#text} at (0,0) size 38x11
+      chunk 1 text run 1 at (10.00,30.00) startOffset 0 endOffset 10 width 37.40: "SVG to fit"
+layer at (0.50,0.50) size 30x40
+  RenderSVGTransformableContainer {g} at (0.50,28.52) size 29x39
+layer at (0.50,0.50) size 29x39
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+layer at (5,5) size 21x21
+  RenderSVGTransformableContainer {g} at (4.50,4.50) size 20x20
+layer at (5,5) size 20x20
+  RenderSVGEllipse {circle} at (0,0) size 20x20 [fill={[type=SOLID] [color=#FFFF00]}] [cx=15.00] [cy=15.00] [r=10.00]
+layer at (10.50,10.50) size 4x4
+  RenderSVGEllipse {circle} at (5.50,5.50) size 3x3 [fill={[type=SOLID] [color=#000000]}] [cx=12.00] [cy=12.00] [r=1.50]
+layer at (15.50,10.50) size 4x4
+  RenderSVGEllipse {circle} at (10.50,5.50) size 3x3 [fill={[type=SOLID] [color=#000000]}] [cx=17.00] [cy=12.00] [r=1.50]
+layer at (10,19) size 10x4
+  RenderSVGPath {path} at (5,14) size 10x4 [stroke={[type=SOLID] [color=#000000] [stroke width=2.00]}] [fill={[type=SOLID] [color=#000000]}] [data="M 10 19 L 15 23 L 20 19"]
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+  RenderSVGText {text} at (10,130) size 41x11 contains 1 chunk(s)
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+  RenderSVGRect {rect} at (0.50,13.52) size 29x59 [stroke={[type=SOLID] [color=#0000FF]}] [x=0.50] [y=0.50] [width=29.00] [height=59.00]
+layer at (0,0) size 30x61 backgroundClip at (0,0) size 30x60 clip at (5,0) size 20x40
+  RenderSVGViewportContainer {svg} at (0,13.02) size 30x60
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+  RenderSVGTransformableContainer {g} at (0,15) size 29.50x72.52
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+  RenderSVGRect {rect} at (0.50,13.52) size 29x59 [stroke={[type=SOLID] [color=#0000FF]}] [x=0.50] [y=0.50] [width=29.00] [height=59.00]
+layer at (0,0) size 30x61 backgroundClip at (0,0) size 30x60 clip at (10,0) size 20x40
+  RenderSVGViewportContainer {svg} at (0,13.02) size 30x60
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+  RenderSVGTransformableContainer {g} at (0,0) size 113.59x67.52
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+  RenderSVGTransformableContainer {g} at (0,15) size 49.50x52.52
+layer at (0.50,0.50) size 50x30
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+  RenderSVGViewportContainer {svg} at (0,13.02) size 50x30
+layer at (0,-13.02) size 50x53 backgroundClip at (0,0) size 1130.39x842.39 clip at (0,0) size 1130.39x842.39
+  RenderSVGTransformableContainer {g} at (0,15) size 49.50x52.52
+layer at (0.50,0.50) size 50x30
+  RenderSVGRect {rect} at (0.50,13.52) size 49x29 [stroke={[type=SOLID] [color=#0000FF]}] [x=0.50] [y=0.50] [width=49.00] [height=29.00]
+layer at (0,0) size 50x31 backgroundClip at (0,24.02) size 30x15.98 clip at (0,11) size 30x18
+  RenderSVGViewportContainer {svg} at (0,13.02) size 50x30
+layer at (0,-13.02) size 50x53 backgroundClip at (0,0) size 1130.39x842.39 clip at (0,0) size 1130.39x842.39
+  RenderSVGTransformableContainer {g} at (0,15) size 49.50x52.52
+layer at (0.50,0.50) size 50x30
+  RenderSVGRect {rect} at (0.50,13.52) size 49x29 [stroke={[type=SOLID] [color=#0000FF]}] [x=0.50] [y=0.50] [width=49.00] [height=29.00]
+layer at (0,0) size 50x31 backgroundClip at (0,35.02) size 30x4.98 clip at (0,22) size 30x18
+  RenderSVGViewportContainer {svg} at (0,13.02) size 50x30
+layer at (10,303.88) size 264x46
+  RenderSVGText {text} at (10,303) size 265x48 contains 1 chunk(s)
+    RenderSVGInlineText {#text} at (0,0) size 265x47
+      chunk 1 text run 1 at (10.00,340.00) startOffset 0 endOffset 16 width 264.47: "$Revision: 1.6 $"
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+  RenderSVGRect {rect} at (1,1) size 478x358 [stroke={[type=SOLID] [color=#000000]}] [x=1.00] [y=1.00] [width=478.00] [height=358.00]

LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/zoom-foreign-content-expected.txt

@@ -0,0 +1,21 @@
+layer at (0,0) size 1628x1213 backgroundClip at (0,0) size 1627.77x1213.05 clip at (0,0) size 1627.77x1213.05
+  RenderView at (0,0) size 785x585
+layer at (0,0) size 1628x1213 backgroundClip at (0,0) size 1627.77x1213.05 clip at (0,0) size 1627.77x1213.05 scrollWidth 942 scrollHeight 702
+  RenderSVGRoot {svg} at (0,0) size 1627.77x1213.05
+layer at (0,0) size 1628x1214 backgroundClip at (0,0) size 1627.77x1213.05 clip at (0,0) size 1627.77x1213.05
+  RenderSVGViewportContainer at (0,0) size 1627.77x1213.05
+layer at (0,0) size 800x600
+  RenderSVGForeignObject {foreignObject} at (0,0) size 800x600
+    RenderText {#text} at (0,0) size 0x0
+layer at (0,0) size 300x150
+  RenderSVGRoot {svg} at (0,0) size 300x150
+layer at (0,0) size 300x150
+  RenderSVGViewportContainer at (0,0) size 300x150
+layer at (0,0) size 99x99
+  RenderSVGRect {rect} at (0,0) size 99x99 [fill={[type=SOLID] [color=#FF0000]}] [x=0.00] [y=0.00] [width=99.00] [height=99.00]
+layer at (0,0) size 800x600
+  RenderSVGForeignObject {foreignObject} at (0,0) size 800x600
+    RenderBlock {html} at (0,0) size 800x99
+      RenderBlock {div} at (0,0) size 99x99 [bgcolor=#FF0000]
+layer at (0,0) size 100x100
+  RenderSVGRect {rect} at (0,0) size 100x100 [fill={[type=SOLID] [color=#008000]}] [x=0.00] [y=0.00] [width=100.00] [height=100.00]

LayoutTests/platform/mac-monterey-wk2-lbse-text/svg/zoom/page/zoom-foreignObject-expected.txt

@@ -0,0 +1,26 @@
+layer at (0,0) size 1130x842
+  RenderView at (0,0) size 785x585
+layer at (0,0) size 1130x842 scrollWidth 942 scrollHeight 702
+  RenderSVGRoot {svg} at (0,0) size 1130.39x842.39
+layer at (0,0) size 1131x843 backgroundClip at (0,0) size 1130.39x842.39 clip at (0,0) size 1130.39x842.39
+  RenderSVGViewportContainer at (0,0) size 1130.39x842.39
+layer at (0,0) size 250x200
+  RenderSVGForeignObject {foreignObject} at (0,0) size 250x200
+    RenderBlock {xhtml:div} at (0,0) size 250x18
+      RenderText {#text} at (0,0) size 83x18
+        text run at (0,0) width 83: "This is a text"
+    RenderBlock (anonymous) at (0,18) size 250x18
+      RenderInline {xhtml:a} at (0,0) size 68x18 [color=#0000EE]
+        RenderText {#text} at (0,0) size 68x18
+          text run at (0,0) width 68: "and a link."
+      RenderBR {xhtml:br} at (67,0) size 1x18
+    RenderBlock {xhtml:div} at (0,36) size 250x18
+      RenderText {#text} at (0,0) size 56x18
+        text run at (0,0) width 56: "[HTML]"
+layer at (0,0) size 250x200
+  RenderSVGRect {rect} at (0,0) size 250x200 [stroke={[type=SOLID] [color=#008000]}] [x=0.00] [y=0.00] [width=250.00] [height=200.00]
+layer at (0,0) size 250x200 scrollHeight 204
+  RenderSVGForeignObject {foreignObject} at (0,0) size 250x200
+    RenderText {#text} at (0,0) size 0x0
+layer at (260,0) size 250x200
+  RenderSVGRect {rect} at (260,0) size 250x200 [stroke={[type=SOLID] [color=#008000]}] [x=260.00] [y=0.00] [width=250.00] [height=200.00]