Implement "root" layout mode #530
Description
What problem does this solve or what need does it fill?
There are some styles that can only or are best applied by the parent of a node. These include:
position(notablyposition: absolute)top/bottom/left/rightmargin
And perhaps:
- Perhaps
width/height/max_width/max_height/min_width/min_height aspect_ratio
Currently these are either not applied to root nodes, or are applied in a duplicated manner within the node's algorithm itself.
What solution would you like?
Much like we have a dedicated simple algorithm for leaf nodes, we ought to create one for root nodes which is applied to the top-level node in any call to compute_layout.
Additional context
- I've tested this on web, and browsers allow the root
<html>node to have styles likeposition/top/left/margin, etc applied. And it seems like a useful thing to allow, so I think we ought to the same. - This layout mode could probably be reused for layout of
position: fixednodes which layout in a very similar way to the root node.