Intent to implement and ship: Overflow media queries

Summary: More explicitly expose the kind of handling for overflowing content in media queries. Using a media expression instead of the print media type allows for more flexibility, see the bug description. Implementation wise, we already expose the same kind of information via @media print rig

Proposed W3C Charter: SVG Working Group

The W3C is proposing a revised charter for: Scalable Vector Graphics (SVG) Working Group https://www.w3.org/Graphics/SVG/svg-2019-ac.html https://lists.w3.org/Archives/Public/public-new-work/2018Dec/0006.html Mozilla has the opportunity to send comments or objections through Friday, January