• Added at least partial support for various SVG elements and their classes: <defs> (SVGDefsElement), <desc> (SVGDescElement), <g> (SVGGElement), <metadata> (SVGMetadataElement), <switch> (SVGSwitchElement), and <symbol> (SVGSymbolElement).
• Added SVGAnimatedPreserveAspectRatio and SVGAnimatedRect, including support in the reflection layer.
• Added the SVGSVGElement createSVGRect() method, and the SVGRect type (which is distinct from DOMRect.)
• Added indexed property support to HTMLFormElement.
• Updated the SVGElement viewportElement() method to correctly establish the viewport based on ancestor elements.
• Removed the now-bloated form-data dependency in favor of our own smaller implementation of multipart/form-data serialization. No functional changes are expected.
• Various performance improvements, caches, microoptimizations, and deferred object creation.