diff --git a/runtime/syntax/testdir/input/vim9_ex_commands.vim b/runtime/syntax/testdir/input/vim9_ex_commands.vim
index c0eb97d..e08cec3 100644
--- a/runtime/syntax/testdir/input/vim9_ex_commands.vim
+++ b/runtime/syntax/testdir/input/vim9_ex_commands.vim
@@ -12,7 +12,7 @@
 :help
  :help
 : help
- : help
+ : help # FIXME
 
 :2match
 :3match
diff --git a/runtime/syntax/testdir/input/vim9_expr.vim b/runtime/syntax/testdir/input/vim9_expr.vim
index 784d861..7faaa5f 100644
--- a/runtime/syntax/testdir/input/vim9_expr.vim
+++ b/runtime/syntax/testdir/input/vim9_expr.vim
@@ -2,6 +2,59 @@
 # Vim9-script expressions
 
 
+# Operators
+
+# Ternary
+
+echo expr ? expr : expr
+
+echo lnum == 1 ? "top" : lnum
+echo lnum == 1 ? "top" : lnum == 1000 ? "last" : lnum
+
+echo lnum == 1
+	? "top"
+	: lnum == 1000
+		? "last"
+		: lnum
+echo lnum == 1 ?
+	"top" :
+	lnum == 1000 ?
+		"last" :
+		lnum
+
+echo true ? true : false
+echo 1 ? 1 : 0
+echo "foo" ? "foo" : "bar"
+echo foo ? foo : bar
+echo g:foo ? g:foo : g:bar
+echo $FOO ? $FOO : $BAR
+echo True() ? True() : False()
+echo @a ? @a : @b
+echo (1) ? (1) : (0)
+
+# Falsy
+
+echo expr ?? expr
+
+echo theList ?? 'list is empty'
+echo GetName() ?? 'unknown'
+
+echo theList
+      \ ?? 'list is empty'
+echo theList ??
+      \ 'list is empty'
+
+echo true ?? true
+echo 1 ?? 1
+echo "foo" ?? "foo"
+echo foo ?? foo
+echo g:foo ?? g:foo
+echo $FOO ?? $FOO
+echo True() ?? True()
+echo @a ?? @a
+echo (1) ?? (1)
+
+
 # Command {expr} arguments
 
 if true
@@ -18,3 +71,37 @@
   return true
 enddef
 
+
+# Issue #14423 (vim.vim: Opt out of vimSearch*)
+
+:?truthy
+const truthy: number = false
+    ? (0
+    )
+    : (1
+    )
+echo truthy
+
+def Foo()
+  :?truthy
+  const truthy: number = false
+      ? (0
+      )
+      : (1
+      )
+  echo truthy
+enddef
+
+
+# Issue #16227 (Vimscript ternary expression highlighting)
+
+var foo = 'foo'                         # comment
+var bar = foo == 'foo' ? 'bar' : 'baz'
+var baz = foo == 'foo'
+            \ ? 'baz'
+            \ : 'bar'
+var qux = foo == 'foo'
+            ? 'qux'                     # comment
+            : 'qux'                     # comment
+echo qux ?? 'quux'
+
diff --git a/runtime/syntax/testdir/input/vim_ex_commands.vim b/runtime/syntax/testdir/input/vim_ex_commands.vim
index 98f32d7..7a58365 100644
--- a/runtime/syntax/testdir/input/vim_ex_commands.vim
+++ b/runtime/syntax/testdir/input/vim_ex_commands.vim
@@ -11,7 +11,7 @@
 :help
  :help
 : help
- : help
+ : help # FIXME
 
 :2match
 :3match
diff --git a/runtime/syntax/testdir/input/vim_expr.vim b/runtime/syntax/testdir/input/vim_expr.vim
index 903db92..569d4ce 100644
--- a/runtime/syntax/testdir/input/vim_expr.vim
+++ b/runtime/syntax/testdir/input/vim_expr.vim
@@ -87,6 +87,52 @@
 
 " Operators
 
+" Ternary
+echo expr ? expr : expr
+
+echo lnum == 1 ? "top" : lnum
+echo lnum == 1 ? "top" : lnum == 1000 ? "last" : lnum
+
+echo lnum == 1
+      \	? "top"
+      \	: lnum == 1000
+      \		? "last"
+      \		: lnum
+echo lnum == 1 ?
+      \	"top" :
+      \	lnum == 1000 ?
+      \		"last" :
+      \		lnum
+
+echo 1 ? 1 : 0
+echo "foo" ? "foo" : "bar"
+echo foo ? foo : bar
+echo g:foo ? g:foo : g:bar
+echo $FOO ? $FOO : $BAR
+echo True() ? True() : False()
+echo @a ? @a : @b
+echo (1) ? (1) : (0)
+
+" Falsy
+echo expr ?? expr
+
+echo theList ?? 'list is empty'
+echo GetName() ?? 'unknown'
+
+echo theList
+      \ ?? 'list is empty'
+echo theList ??
+      \ 'list is empty'
+
+echo 1 ?? 1
+echo "foo" ?? "foo"
+echo foo ?? foo
+echo g:foo ?? g:foo
+echo $FOO ?? $FOO
+echo True() ?? True()
+echo @a ?? @a
+echo (1) ?? (1)
+
 " Comparison - using 'ignorcase'
 echo expr ==     expr
 echo expr !=     expr
@@ -126,6 +172,28 @@
 " Unreported issue (incorrectly matches as "echo vimNumber *vimCommand* vimNumber")
 echo 42 is 42
 
+
 " Issue #16221 (vimString becomes vimVar when preceded by !)
 let bar = !'g:bar'->exists()
 
+
+" Issue #14423 (vim.vim: Opt out of vimSearch*)
+
+?truthy
+let truthy = 0
+\   ? (0
+\   )
+\   : (1
+\   )
+echo truthy
+
+function Foo()
+  ?truthy
+  let truthy = 0
+  \   ? (0
+  \   )
+  \   : (1
+  \   )
+  echo truthy
+endfunction
+