Add a UA style, "display: contents", for <slot>

third_party/WebKit/Source/core/css/html.css

Index: third_party/WebKit/Source/core/css/html.css
diff --git a/third_party/WebKit/Source/core/css/html.css b/third_party/WebKit/Source/core/css/html.css
index 52d3407f8c27e1cfc560df96c60bd69837676227..586eef8a472c3ea73fac1a12bb94b0c504f501f1 100644
--- a/third_party/WebKit/Source/core/css/html.css
+++ b/third_party/WebKit/Source/core/css/html.css
@@ -1099,6 +1099,10 @@ dialog::backdrop {
     background: rgba(0,0,0,0.1)
 }
 
+slot {
+    display: contents;

[kochi, 2016/11/01 05:41:40]

Why this is defined in both html.css and slot.css?
Does it mean slot's UA style applies unconditionally?

[hayato, 2016/11/01 05:46:33]

Ops. I forgot to remove this from html.css. Done.

+}
+
 /* page */
 
 @page {