SVG 2 new features

I'd like to move this into a proper matrix where we can list implementer feedback and support, but for now here's a basic list of what is new in SVG 2.

Note: this list is still being built and is incomplete.

API Changes

• Added "length" attribute and indexed property access to all list interfaces.
• Replace SVGMatrix with DOMMatrix or DOMMatrixReadOnly
• Replace SVGRect with DOMRect or DOMRectReadOnly
• Replace SVGPoint with DOMPoint or DOMPointReadOnly

Markup Changes

• Allow the script element anywhere
• Add crossorigin attribute to the image and script elements

Document Features

• Inclusion of audio and video elements
• Mesh gradients
• Hatch path paint server
• Multiple paints for fill and stroke.
• 'context-fill' and 'context-stroke' values for 'fill' and 'stroke'
  These allow, for example, markers to inherit the stroke color.
• Marker auto-start-reverse
  Has implementations in Firefox, WebKit, Blink, and Inkscape
• Complete overhaul of text layout
  • CSS based multi-line text.
    • Text wrapping given a fixed width/height.
    • Text in a shape.
  • Text-on-a-path changes:
    • Text on a shape.
    • Text on either side of a path.
  • Todo: Add more
• Font features (alternative glyphs, etc.)
• Path features:
  • Auto-closing paths.
  • New line joins (miter-clip, arcs)
• z-index support
• SVG Root and foreignObject are no longer overflow:hidden by default
• Allow scroll bars to be shown for overflow:auto in special cases
• Allow scroll bars when overflow:scroll is set on svg elements
• Use elements defined in terms of Web Components