update elements and fix some bugs

lib/src/prism/tests/languages/less/property_feature.test

Index: lib/src/prism/tests/languages/less/property_feature.test
diff --git a/lib/src/prism/tests/languages/less/property_feature.test b/lib/src/prism/tests/languages/less/property_feature.test
new file mode 100644
index 0000000000000000000000000000000000000000..85288c4b8de6f2435aa95d4672c7252e28d286ef
--- /dev/null
+++ b/lib/src/prism/tests/languages/less/property_feature.test
@@ -0,0 +1,19 @@
+font-weight:
+@{foobar} :
+background-@{foo}:
+box-shadow+:
+transform+_:
+
+----------------------------------------------------
+
+[
+	["property", "font-weight"], ["punctuation", ":"],
+	["property", "@{foobar}"], ["punctuation", ":"],
+	["property", "background-@{foo}"], ["punctuation", ":"],
+	["property", "box-shadow+"], ["punctuation", ":"],
+	["property", "transform+_"], ["punctuation", ":"]
+]
+
+----------------------------------------------------
+
+Checks for properties.