update elements and fix some bugs

lib/src/prism/tests/languages/handlebars/comment_feature.test

Index: lib/src/prism/tests/languages/handlebars/comment_feature.test
diff --git a/lib/src/prism/tests/languages/handlebars/comment_feature.test b/lib/src/prism/tests/languages/handlebars/comment_feature.test
new file mode 100644
index 0000000000000000000000000000000000000000..813f978d6e42f2b422f5cb8ee9dd3cb5cbacb41b
--- /dev/null
+++ b/lib/src/prism/tests/languages/handlebars/comment_feature.test
@@ -0,0 +1,19 @@
+{{! foobar}}
+{{!-- foo bar baz --}}
+{{! foo
+bar }}
+{{!-- foo
+bar --}}
+
+----------------------------------------------------
+
+[
+	["handlebars-comment", "{{! foobar}}"],
+	["handlebars-comment", "{{!-- foo bar baz --}}"],
+	["handlebars-comment", "{{! foo\r\nbar }}"],
+	["handlebars-comment", "{{!-- foo\r\nbar --}}"]
+]
+
+----------------------------------------------------
+
+Checks for comments.