Commits on Dec 1, 2022

1. [popover][anchor-position] Implement implicit anchoring (2/2) …

   - https://drafts.csswg.org/css-anchor-1/#implicit-anchor-element
   - josepharhar/html#2
   
   This is the 2/2 patch implementing implicit anchoring for popovers,
   focusing on layout-level changes.
   
   With the info of which elements are used as implicit anchors, this
   patch adds the implicit anchors into NG*AnchorQuery with LayoutObject
   as keys, so that implicit anchor queries can be evaluated without an
   anchor name.
   
   At a more detailed level, now all the NG*AnchorQuery classes need to
   maintain two hashmaps: one keyed by names for the named anchors, and
   the other keyed by LayoutObjects for the implicit anchors. To reduce
   code verbosity, the common structure of these classes is abstracted
   into a base class NGAnchorQueryBase.
   
   Bug: 1307772, 1380112
   Change-Id: I9bdec5e3c08f9b9b20442503dedf32995643f037
   Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4053342
   Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
   Reviewed-by: Koji Ishii <kojii@chromium.org>
   Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
   Cr-Commit-Position: refs/heads/main@{#1078270}

   

   xiaochengh authored and chromium-wpt-export-bot committed Dec 1, 2022
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