Implement naive Position::Static
#877
Open
+66
−35
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Objective
An initial step in
position: staticsupport. This does not implement hoisting out-of-flow nodes (position:absoluteandposition:fixed) and positioning them relative to their non-direct-parent containing block. But it does implement ignoringinsetforposition:staticnodes and adds some helper methods which can be built upon when we do come to implement hoisting.