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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)