diff --git a/Base/res/html/misc/is-selector.html b/Base/res/html/misc/is-selector.html
new file mode 100644
index 0000000000..96b1cb6bda
--- /dev/null
+++ b/Base/res/html/misc/is-selector.html
@@ -0,0 +1,38 @@
+
+
+
+
+ :is() test
+
+
+
+
:is() test
+
+
Nothing
+
These should have no background.
+
+
+
+
.special :is(h2, p)
+
These should have a green background.
+
+
+
+
.forgiving :is(&&&fakhsdaskjhd, h2, p)
+
These should have a green background. :is() takes a "permissive selector list",
+ so even though part of it is invalid, this does not make the whole selector-list invalid.