diff --git a/Libraries/LibJS/AST.cpp b/Libraries/LibJS/AST.cpp
index 307794971c9..1394c5dc050 100644
--- a/Libraries/LibJS/AST.cpp
+++ b/Libraries/LibJS/AST.cpp
@@ -125,8 +125,12 @@ Value BinaryExpression::execute(Interpreter& interpreter) const
         return Value(!typed_eq(lhs_result, rhs_result).to_boolean());
     case BinaryOp::GreaterThan:
         return greater_than(lhs_result, rhs_result);
+    case BinaryOp::GreaterThanEquals:
+        return greater_than_equals(lhs_result, rhs_result);
     case BinaryOp::LessThan:
         return less_than(lhs_result, rhs_result);
+    case BinaryOp::LessThanEquals:
+        return less_than_equals(lhs_result, rhs_result);
     case BinaryOp::BitwiseAnd:
         return bitwise_and(lhs_result, rhs_result);
     case BinaryOp::BitwiseOr:
@@ -213,9 +217,15 @@ void BinaryExpression::dump(int indent) const
     case BinaryOp::GreaterThan:
         op_string = ">";
         break;
+    case BinaryOp::GreaterThanEquals:
+        op_string = ">=";
+        break;
     case BinaryOp::LessThan:
         op_string = "<";
         break;
+    case BinaryOp::LessThanEquals:
+        op_string = "<=";
+        break;
     case BinaryOp::BitwiseAnd:
         op_string = "&";
         break;
diff --git a/Libraries/LibJS/AST.h b/Libraries/LibJS/AST.h
index 87478f34438..decfa5137b7 100644
--- a/Libraries/LibJS/AST.h
+++ b/Libraries/LibJS/AST.h
@@ -219,7 +219,9 @@ enum class BinaryOp {
     TypedEquals,
     TypedInequals,
     GreaterThan,
+    GreaterThanEquals,
     LessThan,
+    LessThanEquals,
     BitwiseAnd,
     BitwiseOr,
     BitwiseXor,
diff --git a/Libraries/LibJS/Parser.cpp b/Libraries/LibJS/Parser.cpp
index df5e3bca320..38e278300c5 100644
--- a/Libraries/LibJS/Parser.cpp
+++ b/Libraries/LibJS/Parser.cpp
@@ -133,6 +133,12 @@ NonnullOwnPtr<Expression> Parser::parse_secondary_expression(NonnullOwnPtr<Expre
     case TokenType::Slash:
         consume();
         return make<BinaryExpression>(BinaryOp::Slash, move(lhs), parse_expression());
+    case TokenType::GreaterThanEquals:
+        consume();
+        return make<BinaryExpression>(BinaryOp::GreaterThanEquals, move(lhs), parse_expression());
+    case TokenType::LessThanEquals:
+        consume();
+        return make<BinaryExpression>(BinaryOp::LessThanEquals, move(lhs), parse_expression());
     case TokenType::ParenOpen:
         return parse_call_expression(move(lhs));
     case TokenType::Equals:
@@ -248,6 +254,8 @@ bool Parser::match_secondary_expression() const
         || type == TokenType::Asterisk
         || type == TokenType::Slash
         || type == TokenType::Equals
+        || type == TokenType::GreaterThanEquals
+        || type == TokenType::LessThanEquals
         || type == TokenType::ParenOpen
         || type == TokenType::Period;
 }
diff --git a/Libraries/LibJS/Token.h b/Libraries/LibJS/Token.h
index e7f62823047..b5c0bc47a16 100644
--- a/Libraries/LibJS/Token.h
+++ b/Libraries/LibJS/Token.h
@@ -58,11 +58,13 @@ enum class TokenType {
     Finally,
     Function,
     GreaterThan,
+    GreaterThanEquals,
     Identifier,
     If,
     Interface,
     Invalid,
     LessThan,
+    LessThanEquals,
     Let,
     Minus,
     MinusEquals,
diff --git a/Libraries/LibJS/Value.cpp b/Libraries/LibJS/Value.cpp
index a88d2697bcb..c62c84d4969 100644
--- a/Libraries/LibJS/Value.cpp
+++ b/Libraries/LibJS/Value.cpp
@@ -96,6 +96,13 @@ Value greater_than(Value lhs, Value rhs)
     return Value(lhs.as_double() > rhs.as_double());
 }
 
+Value greater_than_equals(Value lhs, Value rhs)
+{
+    ASSERT(lhs.is_number());
+    ASSERT(rhs.is_number());
+    return Value(lhs.as_double() >= rhs.as_double());
+}
+
 Value less_than(Value lhs, Value rhs)
 {
     ASSERT(lhs.is_number());
@@ -103,6 +110,13 @@ Value less_than(Value lhs, Value rhs)
     return Value(lhs.as_double() < rhs.as_double());
 }
 
+Value less_than_equals(Value lhs, Value rhs)
+{
+    ASSERT(lhs.is_number());
+    ASSERT(rhs.is_number());
+    return Value(lhs.as_double() <= rhs.as_double());
+}
+
 Value bitwise_and(Value lhs, Value rhs)
 {
     ASSERT(lhs.is_number());
diff --git a/Libraries/LibJS/Value.h b/Libraries/LibJS/Value.h
index 66b599715de..010d8d3e6cd 100644
--- a/Libraries/LibJS/Value.h
+++ b/Libraries/LibJS/Value.h
@@ -159,7 +159,9 @@ inline Value js_null()
 }
 
 Value greater_than(Value lhs, Value rhs);
+Value greater_than_equals(Value lhs, Value rhs);
 Value less_than(Value lhs, Value rhs);
+Value less_than_equals(Value lhs, Value rhs);
 Value bitwise_and(Value lhs, Value rhs);
 Value bitwise_or(Value lhs, Value rhs);
 Value bitwise_xor(Value lhs, Value rhs);