11.9.4 Strict equals operator ===

EqualityExpression : EqualityExpression === RelationalExpression
EqualityExpressionNoIn : EqualityExpressionNoIn === RelationalExpressionNoIn

function evaluate(EqualityExpression === RelationalExpression) {
var lref = evaluate(EqualityExpression);
var lval = GetValue(lref);
var rref = evaluate(RelationalExpression);
var rval = GetValue(rref);
return StrictEqualityComparison(lval, rval); // 11.9.6
}