[css-grid] Fix definite/indefinite size detection for abspos elements
This is a port from Blink: https://codereview.chromium.org/1383003002
Created attachment 276720 [details] Patch
Comment on attachment 276720 [details] Patch Removing from the review queue as there're some discussion on the CSS WG about the expected behaviour: https://lists.w3.org/Archives/Public/www-style/2016Apr/0329.html It should be resolved in the next F2F meeting (9-11 May).
Safari TP 154 passes all position Grid tests: https://wpt.fyi/results/css/css-grid/abspos?label=master&label=experimental&aligned&view=subtest&q=positioned%20grid Do we need anything from this? Thanks!