Add @webref/idl dependency

Signed-off-by: Victor Porof <victorporof@chromium.org>
Bug: 1325812
Change-Id: I044170880d20ce0402062755787cccafd63c6a42
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3695370
Reviewed-by: Mathias Bynens <mathias@chromium.org>
diff --git a/node_modules/@webref/idl/css-regions.idl b/node_modules/@webref/idl/css-regions.idl
new file mode 100644
index 0000000..7d615fc
--- /dev/null
+++ b/node_modules/@webref/idl/css-regions.idl
@@ -0,0 +1,29 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Regions Module Level 1 (https://drafts.csswg.org/css-regions/)
+
+partial interface Document {
+  readonly attribute NamedFlowMap namedFlows;
+};
+
+[Exposed=Window] interface NamedFlowMap {
+  maplike<CSSOMString, NamedFlow>;
+};
+
+[Exposed=Window]
+interface NamedFlow : EventTarget {
+  readonly attribute CSSOMString name;
+  readonly attribute boolean overset;
+  sequence<Element> getRegions();
+  readonly attribute short firstEmptyRegionIndex;
+  sequence<Node> getContent();
+  sequence<Element> getRegionsByContent(Node node);
+};
+
+interface mixin Region {
+  readonly attribute CSSOMString regionOverset;
+  sequence<Range>? getRegionFlowRanges();
+};
+
+Element includes Region;