Summary: Implement these properties to control breaks in the page, make
page-break-{before,after} legacy shorthands of those.
This work doesn't imply adding new layout functionality, just the style
system rejiggering to make us comply with the spec and be compatible
with other engines.
Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=775618
Link to standard: https://drafts.csswg.org/css-break/
Platform coverage: All platforms
Estimated or target release: Firefox 65
Preference behind which this will be implemented: None
Is this feature enabled by default in sandboxed iframes? Yes
DevTools bug: N/A, existing devtools support should be sufficient.
Do other browser engines implement this? Yes, since forever.
Fragmentation in general is not the most interoperable bit of the web
platform, though regarding these properties, the only thing we don't
support that they would is break-{before,after}: column, since we don't
restrict breaking to columns only.
web-platform-tests:
https://wpt.fyi/results/css/css-break/page-break-legacy-shorthands.html
See the following bugs for failures in other engines:
* https://bugs.chromium.org/p/chromium/issues/detail?id=906336
* https://bugs.webkit.org/show_bug.cgi?id=191803
* Didn't bother filing Edge bugs, given the news :(
Is this feature restricted to secure contexts? No, as other CSS bits.
-- Emilio
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