Rework SVG sizing

Source/core/css/svg.css

Index: Source/core/css/svg.css
diff --git a/Source/core/css/svg.css b/Source/core/css/svg.css
index f860d7baade51651650aab15f3170139dfd39222..6151d17c5d294de7ab2c5aaf098f25279bfc3d07 100644
--- a/Source/core/css/svg.css
+++ b/Source/core/css/svg.css
@@ -47,6 +47,11 @@ svg:not(:root), symbol, image, marker, pattern, foreignObject {
     overflow: hidden
 }
 
+svg:root {

[eseidel, 2014/04/18 16:12:49]

I'm surprised we didn't already ahve this.  Or maybe SVGSVGElement has magical
sizing rules?  I remember fighting with this for a loooong time years ago.

[davve, 2014/04/18 17:24:32]

WebKit had something similar until
https://bugs.webkit.org/show_bug.cgi?id=76447. It was partly based on a
misunderstanding though, as I've been told from old-timers. The 100% default
values was never intended to be included in the viewport calculation. Making
width/height presentation attributes is a compromise that allows percentage
values to be part of the viewport calculation, but the default value should not
be 100%.

https://docs.google.com/presentation/d/1POUiroOBbLmXYlQKf0pIR8zVkHWH9jRVN-w8A...

is the link to the slides I presented and posted to blink-dev a couple of weeks
ago.

+    width: 100%;
+    height: 100%
+}
+
 text, foreignObject {
     display: block
 }