CSS Backgrounds and Borders Level 4

This page is a scratchspace for recording issues and ideas for CSS Backgrounds and Borders Level 4. Send any formal proposals to www-style.

Notes on issues that ultimately need a more formal description:

• Can’t handle cases like http://dabblet.com/gist/55b5f131c45702a55684 where the border is a continuous image (perhaps should be solved with a way to subtract areas in background-clip? Maybe something like background-clip: border-box / padding-box; ?)
• Cases like http://dabblet.com/gist/0f6900d370f55ec9c975 are solved suboptimally (no ems supported in border-image-slice, need to match border-width with border-image-slice etc)

• Logical properties (e.g. border-start-end-radius)
• Side shorthands (e.g. border-top-radius, border-right-radius etc)

• Custom corner shapes? How?
• corners shorthand for corner-shape & border-radius, to avoid clumsy fallback

• Current syntax is confusing. Need to make a list of use cases we need to address and come up with a better syntax.