Add IDL for CSS Pseudo-Elements

Author: MattiasBuelens

inputfiles/idl/CSS Pseudo-Elements.widl

@@ -0,0 +1,9 @@
+[Exposed=Window]
+interface CSSPseudoElement : EventTarget {
+    readonly attribute CSSOMString type;
+    readonly attribute Element element;
+};
+
+partial interface Element {
+  CSSPseudoElement? pseudo(CSSOMString type);
+};

inputfiles/idlSources.json

@@ -108,6 +108,10 @@
         "url": "https://www.w3.org/TR/css-overscroll-1/",
         "title": "CSS Overscroll Behavior"
     },
+    {
+        "url": "https://www.w3.org/TR/css-pseudo-4/",
+        "title": "CSS Pseudo-Elements"
+    },
     {
         "url": "https://www.w3.org/TR/css-ruby-1/",
         "title": "CSS Ruby Layout"