CSS Masking level 2

Ideas for the next level of CSS Masking

People complain about <clipPath> references because of multiple problems:

1. <clipPath> does not have objectBoundingBox and therefore doesn't scale with the clipped element.
2. There is no way to define a preserveAspecRatio and/or a viewBox. example.

General clip-path related complains:

1. There is no path() function.
2. Path data string does not have units.
3. no inverse clipping path
4. multiple clip-paths which can be used in combination to form one clipping path

Masking

1. Support mask-attachment youtube demo