diff --git a/lib/crass/parser.rb b/lib/crass/parser.rb
index fa133ce..82a09bc 100644
--- a/lib/crass/parser.rb
+++ b/lib/crass/parser.rb
@@ -6,7 +6,7 @@ module Crass
 
   # Parses a CSS string or list of tokens.
   #
-  # 5. http://dev.w3.org/csswg/css-syntax/#parsing
+  # 5. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#parsing
   class Parser
     BLOCK_END_TOKENS = {
       :'{' => :'}',
@@ -21,7 +21,7 @@ class Parser
     #
     # See {Tokenizer#initialize} for _options_.
     #
-    # 5.3.6. http://dev.w3.org/csswg/css-syntax/#parse-a-list-of-declarations
+    # 5.3.6. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#parse-a-list-of-declarations
     def self.parse_properties(input, options = {})
       Parser.new(input, options).parse_properties
     end
@@ -32,7 +32,7 @@ def self.parse_properties(input, options = {})
     #
     # See {Tokenizer#initialize} for _options_.
     #
-    # 5.3.3. http://dev.w3.org/csswg/css-syntax/#parse-a-list-of-rules
+    # 5.3.3. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#parse-a-list-of-rules
     def self.parse_rules(input, options = {})
       parser = Parser.new(input, options)
       rules  = parser.consume_rules
@@ -50,7 +50,7 @@ def self.parse_rules(input, options = {})
     #
     # See {Tokenizer#initialize} for _options_.
     #
-    # 5.3.2. http://dev.w3.org/csswg/css-syntax/#parse-a-stylesheet
+    # 5.3.2. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#parse-a-stylesheet
     def self.parse_stylesheet(input, options = {})
       parser = Parser.new(input, options)
       rules  = parser.consume_rules(:top_level => true)
@@ -133,7 +133,7 @@ def initialize(input, options = {})
 
     # Consumes an at-rule and returns it.
     #
-    # 5.4.2. http://dev.w3.org/csswg/css-syntax-3/#consume-at-rule
+    # 5.4.2. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#consume-at-rule
     def consume_at_rule(input = @tokens)
       rule = {}
 
@@ -180,7 +180,7 @@ def consume_at_rule(input = @tokens)
     # Consumes a component value and returns it, or `nil` if there are no more
     # tokens.
     #
-    # 5.4.6. http://dev.w3.org/csswg/css-syntax-3/#consume-a-component-value
+    # 5.4.6. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#consume-a-component-value
     def consume_component_value(input = @tokens)
       return nil unless token = input.consume
 
@@ -205,7 +205,7 @@ def consume_component_value(input = @tokens)
 
     # Consumes a declaration and returns it, or `nil` on parse error.
     #
-    # 5.4.5. http://dev.w3.org/csswg/css-syntax-3/#consume-a-declaration
+    # 5.4.5. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#consume-a-declaration
     def consume_declaration(input = @tokens)
       declaration = {}
       value       = []
@@ -272,7 +272,7 @@ def consume_declaration(input = @tokens)
     #   * **:strict** - Set to `true` to exclude non-standard `:comment`,
     #     `:semicolon`, and `:whitespace` nodes.
     #
-    # 5.4.4. http://dev.w3.org/csswg/css-syntax/#consume-a-list-of-declarations
+    # 5.4.4. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#consume-a-list-of-declarations
     def consume_declarations(input = @tokens, options = {})
       declarations = []
 
@@ -322,7 +322,7 @@ def consume_declarations(input = @tokens, options = {})
 
     # Consumes a function and returns it.
     #
-    # 5.4.8. http://dev.w3.org/csswg/css-syntax-3/#consume-a-function
+    # 5.4.8. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#consume-a-function
     def consume_function(input = @tokens)
       function = {
         :name   => input.current[:value],
@@ -353,7 +353,7 @@ def consume_function(input = @tokens)
     # Consumes a qualified rule and returns it, or `nil` if a parse error
     # occurs.
     #
-    # 5.4.3. http://dev.w3.org/csswg/css-syntax-3/#consume-a-qualified-rule
+    # 5.4.3. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#consume-a-qualified-rule
     def consume_qualified_rule(input = @tokens)
       rule = {:prelude => []}
 
@@ -394,7 +394,7 @@ def consume_qualified_rule(input = @tokens)
 
     # Consumes a list of rules and returns them.
     #
-    # 5.4.1. http://dev.w3.org/csswg/css-syntax/#consume-a-list-of-rules
+    # 5.4.1. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#consume-a-list-of-rules
     def consume_rules(flags = {})
       rules = []
 
@@ -430,7 +430,7 @@ def consume_rules(flags = {})
     # Consumes and returns a simple block associated with the current input
     # token.
     #
-    # 5.4.7. http://dev.w3.org/csswg/css-syntax/#consume-a-simple-block
+    # 5.4.7. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#consume-a-simple-block
     def consume_simple_block(input = @tokens)
       start_token = input.current[:node]
       end_token   = BLOCK_END_TOKENS[start_token]
@@ -479,7 +479,7 @@ def create_style_rule(rule)
 
     # Parses a single component value and returns it.
     #
-    # 5.3.7. http://dev.w3.org/csswg/css-syntax-3/#parse-a-component-value
+    # 5.3.7. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#parse-a-component-value
     def parse_component_value(input = @tokens)
       input = TokenScanner.new(input) unless input.is_a?(TokenScanner)
 
@@ -506,7 +506,7 @@ def parse_component_value(input = @tokens)
 
     # Parses a list of component values and returns an array of parsed tokens.
     #
-    # 5.3.8. http://dev.w3.org/csswg/css-syntax/#parse-a-list-of-component-values
+    # 5.3.8. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#parse-a-list-of-component-values
     def parse_component_values(input = @tokens)
       input  = TokenScanner.new(input) unless input.is_a?(TokenScanner)
       tokens = []
@@ -520,7 +520,7 @@ def parse_component_values(input = @tokens)
 
     # Parses a single declaration and returns it.
     #
-    # 5.3.5. http://dev.w3.org/csswg/css-syntax/#parse-a-declaration
+    # 5.3.5. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#parse-a-declaration
     def parse_declaration(input = @tokens)
       input = TokenScanner.new(input) unless input.is_a?(TokenScanner)
 
@@ -548,7 +548,7 @@ def parse_declaration(input = @tokens)
     #
     # See {#consume_declarations} for _options_.
     #
-    # 5.3.6. http://dev.w3.org/csswg/css-syntax/#parse-a-list-of-declarations
+    # 5.3.6. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#parse-a-list-of-declarations
     def parse_declarations(input = @tokens, options = {})
       input = TokenScanner.new(input) unless input.is_a?(TokenScanner)
       consume_declarations(input, options)
@@ -582,7 +582,7 @@ def parse_properties(input = @tokens)
 
     # Parses a single rule and returns it.
     #
-    # 5.3.4. http://dev.w3.org/csswg/css-syntax-3/#parse-a-rule
+    # 5.3.4. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#parse-a-rule
     def parse_rule(input = @tokens)
       input = TokenScanner.new(input) unless input.is_a?(TokenScanner)
 
diff --git a/lib/crass/tokenizer.rb b/lib/crass/tokenizer.rb
index d6ab9a1..2fb7cbe 100644
--- a/lib/crass/tokenizer.rb
+++ b/lib/crass/tokenizer.rb
@@ -5,7 +5,7 @@ module Crass
 
   # Tokenizes a CSS string.
   #
-  # 4. http://dev.w3.org/csswg/css-syntax/#tokenization
+  # 4. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#tokenization
   class Tokenizer
     RE_COMMENT_CLOSE   = /\*\//
     RE_DIGIT           = /[0-9]+/
@@ -66,7 +66,7 @@ def initialize(input, options = {})
 
     # Consumes a token and returns the token that was consumed.
     #
-    # 4.3.1. http://dev.w3.org/csswg/css-syntax/#consume-a-token
+    # 4.3.1. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#consume-a-token
     def consume
       return nil if @s.eos?
 
@@ -271,7 +271,7 @@ def consume
 
     # Consumes the remnants of a bad URL and returns the consumed text.
     #
-    # 4.3.15. http://dev.w3.org/csswg/css-syntax/#consume-the-remnants-of-a-bad-url
+    # 4.3.15. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#consume-the-remnants-of-a-bad-url
     def consume_bad_url
       text = String.new
 
@@ -297,7 +297,7 @@ def consume_bad_url
 
     # Consumes comments and returns them, or `nil` if no comments were consumed.
     #
-    # 4.3.2. http://dev.w3.org/csswg/css-syntax/#consume-comments
+    # 4.3.2. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#consume-comments
     def consume_comments
       if @s.peek(2) == '/*'
         @s.consume
@@ -322,7 +322,7 @@ def consume_comments
     # next character in the input has already been verified not to be a newline
     # or EOF.
     #
-    # 4.3.8. http://dev.w3.org/csswg/css-syntax/#consume-an-escaped-code-point
+    # 4.3.8. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#consume-an-escaped-code-point
     def consume_escaped
       return "\ufffd" if @s.eos?
 
@@ -346,7 +346,7 @@ def consume_escaped
 
     # Consumes an ident-like token and returns it.
     #
-    # 4.3.4. http://dev.w3.org/csswg/css-syntax/#consume-an-ident-like-token
+    # 4.3.4. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#consume-an-ident-like-token
     def consume_ident
       value = consume_name
 
@@ -371,7 +371,7 @@ def consume_ident
 
     # Consumes a name and returns it.
     #
-    # 4.3.12. http://dev.w3.org/csswg/css-syntax/#consume-a-name
+    # 4.3.12. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#consume-a-name
     def consume_name
       result = String.new
 
@@ -403,7 +403,7 @@ def consume_name
     # original representation, its numeric value, and its type (either
     # `:integer` or `:number`).
     #
-    # 4.3.13. http://dev.w3.org/csswg/css-syntax/#consume-a-number
+    # 4.3.13. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#consume-a-number
     def consume_number
       repr = String.new
       type = :integer
@@ -426,7 +426,7 @@ def consume_number
 
     # Consumes a numeric token and returns it.
     #
-    # 4.3.3. http://dev.w3.org/csswg/css-syntax/#consume-a-numeric-token
+    # 4.3.3. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#consume-a-numeric-token
     def consume_numeric
       number = consume_number
       repr = number[0]
@@ -465,7 +465,7 @@ def consume_numeric
     # Consumes a string token that ends at the given character, and returns the
     # token.
     #
-    # 4.3.5. http://dev.w3.org/csswg/css-syntax/#consume-a-string-token
+    # 4.3.5. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#consume-a-string-token
     def consume_string(ending = nil)
       ending = @s.current if ending.nil?
       value  = String.new
@@ -506,7 +506,7 @@ def consume_string(ending = nil)
     # Consumes a Unicode range token and returns it. Assumes the initial "u+" or
     # "U+" has already been consumed.
     #
-    # 4.3.7. http://dev.w3.org/csswg/css-syntax/#consume-a-unicode-range-token
+    # 4.3.7. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#consume-a-unicode-range-token
     def consume_unicode_range
       value = @s.scan(RE_HEX) || String.new
 
@@ -538,7 +538,7 @@ def consume_unicode_range
     # Consumes a URL token and returns it. Assumes the original "url(" has
     # already been consumed.
     #
-    # 4.3.6. http://dev.w3.org/csswg/css-syntax/#consume-a-url-token
+    # 4.3.6. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#consume-a-url-token
     def consume_url
       value = String.new
 
@@ -586,7 +586,7 @@ def consume_url
 
     # Converts a valid CSS number string into a number and returns the number.
     #
-    # 4.3.14. http://dev.w3.org/csswg/css-syntax/#convert-a-string-to-a-number
+    # 4.3.14. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#convert-a-string-to-a-number
     def convert_string_to_number(str)
       matches = RE_NUMBER_STR.match(str)
 
@@ -623,7 +623,7 @@ def create_token(type, properties = {})
 
     # Preprocesses _input_ to prepare it for the tokenizer.
     #
-    # 3.3. http://dev.w3.org/csswg/css-syntax/#input-preprocessing
+    # 3.3. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#input-preprocessing
     def preprocess(input)
       input = input.to_s.encode('UTF-8',
         :invalid => :replace,
@@ -638,7 +638,7 @@ def preprocess(input)
     # identifier. If _text_ is `nil`, the current and next two characters in the
     # input stream will be checked, but will not be consumed.
     #
-    # 4.3.10. http://dev.w3.org/csswg/css-syntax/#would-start-an-identifier
+    # 4.3.10. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#would-start-an-identifier
     def start_identifier?(text = nil)
       text = @s.current + @s.peek(2) if text.nil?
 
@@ -662,7 +662,7 @@ def start_identifier?(text = nil)
     # If _text_ is `nil`, the current and next two characters in the input
     # stream will be checked, but will not be consumed.
     #
-    # 4.3.11. http://dev.w3.org/csswg/css-syntax/#starts-with-a-number
+    # 4.3.11. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#starts-with-a-number
     def start_number?(text = nil)
       text = @s.current + @s.peek(2) if text.nil?
 
@@ -698,7 +698,7 @@ def tokenize
     # valid escape sequence. If _text_ is `nil`, the current and next character
     # in the input stream will be checked, but will not be consumed.
     #
-    # 4.3.9. http://dev.w3.org/csswg/css-syntax/#starts-with-a-valid-escape
+    # 4.3.9. https://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#starts-with-a-valid-escape
     def valid_escape?(text = nil)
       text = @s.current + @s.peek if text.nil?
       !!(text[0] == '\\' && text[1] != "\n")
diff --git a/test/test_css_parsing_tests.rb b/test/test_css_parsing_tests.rb
index f40ca12..a6ca7ec 100644
--- a/test/test_css_parsing_tests.rb
+++ b/test/test_css_parsing_tests.rb
@@ -23,7 +23,7 @@ def load_css_tests(filename)
       css      = test[0]
       expected = test[1]
 
-      it "should parse: #{css.gsub("\n", "\\n")}" do
+      it "should parse: #{css.gsub("\n", "\\n").inspect}" do
         parser = Crass::Parser.new(css)
         assert_equal(expected, translate_tokens(parser.parse_component_values))
       end
@@ -40,7 +40,7 @@ def load_css_tests(filename)
       css      = test[0]
       expected = test[1]
 
-      it "should parse: #{css.gsub("\n", "\\n")}" do
+      it "should parse: #{css.gsub("\n", "\\n").inspect}" do
         parser = Crass::Parser.new(css)
         assert_equal(expected, translate_tokens(parser.parse_declarations(parser.tokens, {:strict => true})))
       end
@@ -57,7 +57,7 @@ def load_css_tests(filename)
       css      = test[0]
       expected = test[1]
 
-      it "should parse: #{css.gsub("\n", "\\n")}" do
+      it "should parse: #{css.gsub("\n", "\\n").inspect}" do
         parser = Crass::Parser.new(css)
         assert_equal(expected, translate_tokens(parser.parse_component_value)[0])
       end
@@ -74,7 +74,7 @@ def load_css_tests(filename)
       css      = test[0]
       expected = test[1]
 
-      it "should parse: #{css.gsub("\n", "\\n")}" do
+      it "should parse: #{css.gsub("\n", "\\n").inspect}" do
         parser = Crass::Parser.new(css)
         assert_equal(expected, translate_tokens(parser.parse_declaration)[0])
       end
@@ -91,7 +91,7 @@ def load_css_tests(filename)
       css      = test[0]
       expected = test[1]
 
-      it "should parse: #{css.gsub("\n", "\\n")}" do
+      it "should parse: #{css.gsub("\n", "\\n").inspect}" do
         parser = Crass::Parser.new(css)
         assert_equal(expected, translate_tokens(parser.parse_rule)[0])
       end
@@ -108,7 +108,7 @@ def load_css_tests(filename)
       css      = test[0]
       expected = test[1]
 
-      it "should parse: #{css.gsub("\n", "\\n")}" do
+      it "should parse: #{css.gsub("\n", "\\n").inspect}" do
         parser = Crass::Parser.new(css)
         rules  = parser.consume_rules
 
@@ -133,7 +133,7 @@ def load_css_tests(filename)
       css      = test[0]
       expected = test[1]
 
-      it "should parse: #{css.gsub("\n", "\\n")}" do
+      it "should parse: #{css.gsub("\n", "\\n").inspect}" do
         parser = Crass::Parser.new(css)
         rules  = parser.consume_rules(:top_level => true)