Bug 1888597 [wpt PR 45424] - [css-anchor-position] Simple implementat…

…ion for position-visibility: anchors-valid, a=testonly

Automatic update from web-platform-tests
[css-anchor-position] Simple implementation for position-visibility: anchors-valid

Due to the complexity to implement the original proposal of
position-visibility: anchors-valid and anchors-visible in
w3c/csswg-drafts#7758 (comment),
we have proposed a simple implementation
w3c/csswg-drafts#7758 (comment)
and this implementation is based on the simple proposal.

Bug: 329703412
Change-Id: I7ac5d9bfbd5a3c89822567ffa6701cc66959b665
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5406199
Reviewed-by: Philip Rogers <[email protected]>
Commit-Queue: Xianzhu Wang <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1280441}

--

wpt-commits: f401f6100e5dcf03da047fd6164fa5132064ef13
wpt-pr: 45424

testing/web-platform/tests/css/css-anchor-position/position-visibility-anchors-valid-ref.html

@@ -5,12 +5,13 @@
     width: 100px;
     height: 100px;
     background: orange;
-    display: inline-block;
+  }
+  .target {
+    width: 100px;
+    height: 100px;
+    background: green;
   }
 </style>
 
 <div class="anchor">anchor1</div>
-
-<div class="anchor">anchor2</div>
-
-<div class="anchor">anchor3</div>
+<div class="target">target1</div>

testing/web-platform/tests/css/css-anchor-position/position-visibility-anchors-valid.tentative.html

@@ -23,14 +23,9 @@
   }
 </style>
 
-<!-- #target1 should not be visible because anchor name does not exist. -->
+<!-- #target1 should be visible. -->
 <div class="anchor" style="anchor-name: --a1;">anchor1</div>
-<div id="target1" class="target" style="position-anchor: --does-not-exist;">target1</div>
+<div id="target1" class="target" style="position-anchor: --a1; background: green">target1</div>
 
-<!-- #target2 should not be visible because referenced name in anchor() does not exist. -->
-<div class="anchor" style="anchor-name: --a2;">anchor2</div>
-<div id="target2" class="target" style="position-anchor: --a2; top: anchor(--does-not-exist bottom);">target2</div>
-
-<!-- #target3 should not be visible because referenced name in anchor-size() does not exist. -->
-<div class="anchor" style="anchor-name: --a3;">anchor3</div>
-<div id="target3" class="target" style="position-anchor: --a3; min-width: anchor-width(--does-not-exist width);">target3</div>
+<!-- #target2 should not be visible because anchor name does not exist. -->
+<div id="target2" class="target" style="top: anchor(--does-not-exist bottom);">target2</div>