Bug 1707170 - Fix will-change-stacking-context-z-index-1.html.

z-index doesn't apply to non-positioned elements, so will-change: z-index does nothing in that case per spec. MANUAL PUSH: Orange fix CLOSED TREE
2021-05-10 16:12:04 +02:00 · 2021-05-10 16:12:04 +02:00 · 2b15d4a06b
--- a/testing/web-platform/tests/css/css-will-change/will-change-stacking-context-z-index-1.html
+++ b/testing/web-platform/tests/css/css-will-change/will-change-stacking-context-z-index-1.html
@ -10,7 +10,7 @@
 <style>
 html, body { margin: 0; padding: 0; }
 div { width: 100px; height: 100px }
-#wc { will-change: z-index; background: red }
+#wc { will-change: z-index; background: red; position: relative }
 #child { position: absolute; top: 0; left: 0; z-index: -1; background: green }
 </style>
 <body>