bool SVGSVGElement::widthAttributeEstablishesViewport() const
{
if (!renderer() || renderer()->isSVGViewportContainer())
return true;
// Spec: http://www.w3.org/TR/SVG/coords.html#ViewportSpace
// The ‘width’ attribute on the outermost svg element establishes the viewport's width, unless the following conditions are met:
// - the SVG content is a separately stored resource that is embedded by reference (such as the ‘object’ element in XHTML [XHTML]), or
// the SVG content is embedded inline within a containing document;
// - and the referencing element or containing document is styled using CSS [CSS2] or XSL [XSL];
// - and there are CSS-compatible positioning properties ([CSS2], section 9.3) specified on the referencing element (e.g., the ‘object’ element)
// or on the containing document's outermost svg element that are sufficient to establish the width of the viewport. Under these conditions,
// the positioning properties establish the viewport's width.
RenderSVGRoot* root = toRenderSVGRoot(renderer());
// SVG embedded through object/embed/iframe.
if (root->isEmbeddedThroughFrameContainingSVGDocument())
return !root->hasReplacedLogicalWidth() && !document()->frame()->ownerRenderer()->hasReplacedLogicalWidth();
// SVG embedded via SVGImage (background-image/border-image/etc) / Inline SVG.
if (root->isEmbeddedThroughSVGImage() || document()->documentElement() != this)
return !root->hasReplacedLogicalWidth();
return true;
}
bool SVGSVGElement::heightAttributeEstablishesViewport() const
{
if (!renderer() || renderer()->isSVGViewportContainer())
return true;
// Spec: http://www.w3.org/TR/SVG/coords.html#IntrinsicSizing
// Similarly, if there are positioning properties specified on the referencing element or on the outermost svg element
// that are sufficient to establish the height of the viewport, then these positioning properties establish the viewport's
// height; otherwise, the ‘height’ attribute on the outermost svg element establishes the viewport's height.
RenderSVGRoot* root = toRenderSVGRoot(renderer());
// SVG embedded through object/embed/iframe.
if (root->isEmbeddedThroughFrameContainingSVGDocument())
return !root->hasReplacedLogicalHeight() && !document()->frame()->ownerRenderer()->hasReplacedLogicalHeight();
// SVG embedded via SVGImage (background-image/border-image/etc) / Inline SVG.
if (root->isEmbeddedThroughSVGImage() || document()->documentElement() != this)
return !root->hasReplacedLogicalHeight();
return true;
}