diff --git a/src/parse/value/parse.rs b/src/parse/value/parse.rs
index f1483cb..cbd72bc 100644
--- a/src/parse/value/parse.rs
+++ b/src/parse/value/parse.rs
@@ -11,7 +11,7 @@ use peekmore::{PeekMore, PeekMoreIterator};
 use crate::{
     builtin::GLOBAL_FUNCTIONS,
     color::{Color, NAMED_COLORS},
-    common::{Brackets, Identifier, ListSeparator, Op, QuoteKind},
+    common::{unvendor, Brackets, Identifier, ListSeparator, Op, QuoteKind},
     error::SassResult,
     unit::Unit,
     utils::{
@@ -301,7 +301,7 @@ impl<'a> Parser<'a> {
                         .span(span));
                     } else {
                         // check for special cased CSS functions
-                        match lower.as_str() {
+                        match unvendor(&lower) {
                             "calc" | "element" | "expression" => {
                                 s = lower;
                                 self.parse_calc_args(&mut s)?;
diff --git a/tests/special-functions.rs b/tests/special-functions.rs
index a60452b..8ec9a55 100644
--- a/tests/special-functions.rs
+++ b/tests/special-functions.rs
@@ -46,6 +46,11 @@ test!(
     "a {\n  color: cAlC(1 + 1);\n}\n",
     "a {\n  color: calc(1 + 1);\n}\n"
 );
+test!(
+    calc_browser_prefixed,
+    "a {\n  color: -webkit-calc(1 + 2);\n}\n",
+    "a {\n  color: -webkit-calc(1 + 2);\n}\n"
+);
 test!(
     element_whitespace,
     "a {\n  color: element(       1      );\n}\n",
@@ -81,6 +86,11 @@ test!(
     element_nested_parens,
     "a {\n  color: element((((()))));\n}\n"
 );
+test!(
+    element_browser_prefixed,
+    "a {\n  color: -webkit-element(1 + 2);\n}\n",
+    "a {\n  color: -webkit-element(1 + 2);\n}\n"
+);
 test!(
     expression_whitespace,
     "a {\n  color: expression(       1      );\n}\n",
@@ -116,6 +126,11 @@ test!(
     expression_nested_parens,
     "a {\n  color: expression((((()))));\n}\n"
 );
+test!(
+    expression_browser_prefixed,
+    "a {\n  color: -webkit-expression(1 + 2);\n}\n",
+    "a {\n  color: -webkit-expression(1 + 2);\n}\n"
+);
 test!(
     progid_whitespace,
     "a {\n  color: progid:(       1      );\n}\n",
diff --git a/tests/url.rs b/tests/url.rs
index 0373825..5228f07 100644
--- a/tests/url.rs
+++ b/tests/url.rs
@@ -134,6 +134,11 @@ test!(
     "a {\n  color: UrL(http://foo);\n}\n",
     "a {\n  color: url(http://foo);\n}\n"
 );
+test!(
+    url_browser_prefixed,
+    "a {\n  color: -webkit-url(https://google.com);\n}\n",
+    "a {\n  color: url(https://google.com);\n}\n"
+);
 error!(
     url_nothing_after_forward_slash_in_interpolation,
     "a { color: url(#{/", "Error: Expected expression."