5 files changed, 129 insertions, 0 deletions
diff --git a/wp-includes/blocks/navigation-submenu/block.json b/wp-includes/blocks/navigation-submenu/block.json
new file mode 100644
index 0000000..9136410
--- /dev/null
+++ b/wp-includes/blocks/navigation-submenu/block.json
@@ -0,0 +1,65 @@
+{
+	"$schema": "https://schemas.wp.org/trunk/block.json",
+	"apiVersion": 3,
+	"name": "core/navigation-submenu",
+	"title": "Submenu",
+	"category": "design",
+	"parent": [ "core/navigation" ],
+	"description": "Add a submenu to your navigation.",
+	"textdomain": "default",
+	"attributes": {
+		"label": {
+			"type": "string"
+		},
+		"type": {
+			"type": "string"
+		},
+		"description": {
+			"type": "string"
+		},
+		"rel": {
+			"type": "string"
+		},
+		"id": {
+			"type": "number"
+		},
+		"opensInNewTab": {
+			"type": "boolean",
+			"default": false
+		},
+		"url": {
+			"type": "string"
+		},
+		"title": {
+			"type": "string"
+		},
+		"kind": {
+			"type": "string"
+		},
+		"isTopLevelItem": {
+			"type": "boolean"
+		}
+	},
+	"usesContext": [
+		"textColor",
+		"customTextColor",
+		"backgroundColor",
+		"customBackgroundColor",
+		"overlayTextColor",
+		"customOverlayTextColor",
+		"overlayBackgroundColor",
+		"customOverlayBackgroundColor",
+		"fontSize",
+		"customFontSize",
+		"showSubmenuIcon",
+		"maxNestingLevel",
+		"openSubmenusOnClick",
+		"style"
+	],
+	"supports": {
+		"reusable": false,
+		"html": false
+	},
+	"editorStyle": "wp-block-navigation-submenu-editor",
+	"style": "wp-block-navigation-submenu"
+}
diff --git a/wp-includes/blocks/navigation-submenu/editor-rtl.css b/wp-includes/blocks/navigation-submenu/editor-rtl.css
new file mode 100644
index 0000000..e13b9ba
--- /dev/null
+++ b/wp-includes/blocks/navigation-submenu/editor-rtl.css
@@ -0,0 +1,31 @@
+.wp-block-navigation-submenu{
+  display:block;
+}
+.wp-block-navigation-submenu .wp-block-navigation__submenu-container{
+  z-index:28;
+}
+.wp-block-navigation-submenu.has-child-selected>.wp-block-navigation__submenu-container,.wp-block-navigation-submenu.is-selected>.wp-block-navigation__submenu-container{
+  height:auto !important;
+  min-width:200px !important;
+  opacity:1 !important;
+  position:absolute;
+  right:-1px;
+  top:100%;
+  visibility:visible !important;
+  width:auto !important;
+}
+@media (min-width:782px){
+  .wp-block-navigation-submenu.has-child-selected>.wp-block-navigation__submenu-container .wp-block-navigation__submenu-container,.wp-block-navigation-submenu.is-selected>.wp-block-navigation__submenu-container .wp-block-navigation__submenu-container{
+    right:100%;
+    top:-1px;
+  }
+  .wp-block-navigation-submenu.has-child-selected>.wp-block-navigation__submenu-container .wp-block-navigation__submenu-container:before,.wp-block-navigation-submenu.is-selected>.wp-block-navigation__submenu-container .wp-block-navigation__submenu-container:before{
+    background:transparent;
+    content:"";
+    display:block;
+    height:100%;
+    left:100%;
+    position:absolute;
+    width:.5em;
+  }
+}
+\ No newline at end of file
diff --git a/wp-includes/blocks/navigation-submenu/editor-rtl.min.css b/wp-includes/blocks/navigation-submenu/editor-rtl.min.css
new file mode 100644
index 0000000..85f8d79
--- /dev/null
+++ b/wp-includes/blocks/navigation-submenu/editor-rtl.min.css
@@ -0,0 +1 @@
+.wp-block-navigation-submenu{display:block}.wp-block-navigation-submenu .wp-block-navigation__submenu-container{z-index:28}.wp-block-navigation-submenu.has-child-selected>.wp-block-navigation__submenu-container,.wp-block-navigation-submenu.is-selected>.wp-block-navigation__submenu-container{height:auto!important;min-width:200px!important;opacity:1!important;position:absolute;right:-1px;top:100%;visibility:visible!important;width:auto!important}@media (min-width:782px){.wp-block-navigation-submenu.has-child-selected>.wp-block-navigation__submenu-container .wp-block-navigation__submenu-container,.wp-block-navigation-submenu.is-selected>.wp-block-navigation__submenu-container .wp-block-navigation__submenu-container{right:100%;top:-1px}.wp-block-navigation-submenu.has-child-selected>.wp-block-navigation__submenu-container .wp-block-navigation__submenu-container:before,.wp-block-navigation-submenu.is-selected>.wp-block-navigation__submenu-container .wp-block-navigation__submenu-container:before{background:transparent;content:"";display:block;height:100%;left:100%;position:absolute;width:.5em}}
+\ No newline at end of file
diff --git a/wp-includes/blocks/navigation-submenu/editor.css b/wp-includes/blocks/navigation-submenu/editor.css
new file mode 100644
index 0000000..866c2d3
--- /dev/null
+++ b/wp-includes/blocks/navigation-submenu/editor.css
@@ -0,0 +1,31 @@
+.wp-block-navigation-submenu{
+  display:block;
+}
+.wp-block-navigation-submenu .wp-block-navigation__submenu-container{
+  z-index:28;
+}
+.wp-block-navigation-submenu.has-child-selected>.wp-block-navigation__submenu-container,.wp-block-navigation-submenu.is-selected>.wp-block-navigation__submenu-container{
+  height:auto !important;
+  left:-1px;
+  min-width:200px !important;
+  opacity:1 !important;
+  position:absolute;
+  top:100%;
+  visibility:visible !important;
+  width:auto !important;
+}
+@media (min-width:782px){
+  .wp-block-navigation-submenu.has-child-selected>.wp-block-navigation__submenu-container .wp-block-navigation__submenu-container,.wp-block-navigation-submenu.is-selected>.wp-block-navigation__submenu-container .wp-block-navigation__submenu-container{
+    left:100%;
+    top:-1px;
+  }
+  .wp-block-navigation-submenu.has-child-selected>.wp-block-navigation__submenu-container .wp-block-navigation__submenu-container:before,.wp-block-navigation-submenu.is-selected>.wp-block-navigation__submenu-container .wp-block-navigation__submenu-container:before{
+    background:transparent;
+    content:"";
+    display:block;
+    height:100%;
+    position:absolute;
+    right:100%;
+    width:.5em;
+  }
+}
+\ No newline at end of file
diff --git a/wp-includes/blocks/navigation-submenu/editor.min.css b/wp-includes/blocks/navigation-submenu/editor.min.css
new file mode 100644
index 0000000..e55a4d8
--- /dev/null
+++ b/wp-includes/blocks/navigation-submenu/editor.min.css
@@ -0,0 +1 @@
+.wp-block-navigation-submenu{display:block}.wp-block-navigation-submenu .wp-block-navigation__submenu-container{z-index:28}.wp-block-navigation-submenu.has-child-selected>.wp-block-navigation__submenu-container,.wp-block-navigation-submenu.is-selected>.wp-block-navigation__submenu-container{height:auto!important;left:-1px;min-width:200px!important;opacity:1!important;position:absolute;top:100%;visibility:visible!important;width:auto!important}@media (min-width:782px){.wp-block-navigation-submenu.has-child-selected>.wp-block-navigation__submenu-container .wp-block-navigation__submenu-container,.wp-block-navigation-submenu.is-selected>.wp-block-navigation__submenu-container .wp-block-navigation__submenu-container{left:100%;top:-1px}.wp-block-navigation-submenu.has-child-selected>.wp-block-navigation__submenu-container .wp-block-navigation__submenu-container:before,.wp-block-navigation-submenu.is-selected>.wp-block-navigation__submenu-container .wp-block-navigation__submenu-container:before{background:transparent;content:"";display:block;height:100%;position:absolute;right:100%;width:.5em}}
+\ No newline at end of file