Bug 1786626 [wpt PR 35586] - Incorporate updates to pop-up UA stylesh…

…eet, a=testonly

Automatic update from web-platform-tests
Incorporate updates to pop-up UA stylesheet

There's been pushback [1] to the !important rule on display:none,
and more conversation about padding. This CL updates the behavior
to keep up with the conversation. It also un-breaks several demos
that were relying on the non-!important display:none rule.

[1] openui/open-ui#561 (comment)

Bug: 1307772
Change-Id: Ia267bf54546e433436963ae4a89d7828181c7015
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3851364
Auto-Submit: Mason Freed <masonf@chromium.org>
Commit-Queue: Mason Freed <masonf@chromium.org>
Reviewed-by: David Baron <dbaron@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1038529}

--

wpt-commits: b1b8cdddc3fe9cbb5fe13fc05cbe25f6d574b6dd
wpt-pr: 35586

testing/web-platform/tests/html/semantics/popups/popup-hidden-display-ref.tentative.html

@@ -2,3 +2,18 @@
 <meta charset="utf-8">
 <link rel=author href="mailto:masonf@chromium.org">
 <link rel="stylesheet" href="resources/popup-styles.css">
+
+
+<div class=fake-pop-up>This content should be visible and green</div>
+<div class=fake-pop-up style="top:100px;">This content should be visible and green</div>
+<div class=fake-pop-up style="top:200px;">This content should be visible and green</div>
+
+<style>
+  .fake-pop-up {
+    top: 0;
+    margin:10px;
+    width: 300px;
+    height: 50px;
+    background: green;
+  }
+</style>

testing/web-platform/tests/html/semantics/popups/popup-hidden-display.tentative.html

@@ -4,14 +4,34 @@
 <link rel=help href="https://open-ui.org/components/popup.research.explainer">
 <link rel=match href="popup-hidden-display-ref.tentative.html">
 
-<div popup>This content should *not* be visible</div>
-<div popup=invalid>This content should *not* be visible</div>
+<div class=nottoplayer popup                           >This content should be visible and green</div>
+<div class=nottoplayer popup=invalid style="top:100px;">This content should be visible and green</div>
+<div class=toplayer    popup         style="top:200px;">This content should be visible and green</div>
 
 <style>
   [popup] {
-    display: block !important; /* This should *not* make the popup visible */
+    display: block; /* This should make the popup visible */
     top: 0;
+    margin:10px;
     width: 300px;
-    height: 200px;
+    height: 50px;
+  }
+  [popup].nottoplayer {
+    background: green;
+  }
+  [popup].toplayer {
+    background: red;
+  }
+  [popup].toplayer:top-layer {
+    background: green;
+  }
+  [popup].nottoplayer:top-layer {
+    background: red;
   }
 </style>
+<script>
+  const toplayer = document.querySelectorAll('[popup].toplayer');
+  if (toplayer.length !== 1)
+    document.write('FAIL');
+  toplayer[0].showPopUp();
+</script>

testing/web-platform/tests/html/semantics/popups/resources/popup-styles.css

@@ -1,19 +1,17 @@
 .fake-pop-up {
   position: fixed;
-  inset-inline-start: 0;
-  inset-inline-end: 0;
-  inset-block-start: 0;
-  inset-block-end: 0;
+  inset: 0;
   width: fit-content;
   height: fit-content;
   margin: auto;
   border: solid;
+  padding: 0.25em;
   overflow: auto;
   color: CanvasText;
   background-color: Canvas;
 }
 .fake-pop-up-backdrop {
   position: fixed;
-  top:0; right:0; bottom:0; left:0;
+  inset:0;
   pointer-events: none !important;
 }