Libraries: Use default constructors/destructors in LibWeb

https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#cother-other-default-operation-rules

"The compiler is more likely to get the default semantics right and
you cannot implement these functions better than the compiler."

Userland/Libraries/LibWeb/CSS/CSSConditionRule.cpp

@@ -13,10 +13,6 @@ CSSConditionRule::CSSConditionRule(NonnullRefPtrVector<CSSRule>&& rules)
 {
 }
 
-CSSConditionRule::~CSSConditionRule()
-{
-}
-
 void CSSConditionRule::for_each_effective_style_rule(Function<void(CSSStyleRule const&)> const& callback) const
 {
     if (condition_matches())

Userland/Libraries/LibWeb/CSS/CSSConditionRule.h

@@ -17,7 +17,7 @@ class CSSConditionRule : public CSSGroupingRule {
     AK_MAKE_NONMOVABLE(CSSConditionRule);
 
 public:
-    ~CSSConditionRule();
+    ~CSSConditionRule() = default;
 
     virtual String condition_text() const = 0;
     virtual void set_condition_text(String) = 0;

Userland/Libraries/LibWeb/CSS/CSSGroupingRule.cpp

@@ -14,10 +14,6 @@ CSSGroupingRule::CSSGroupingRule(NonnullRefPtrVector<CSSRule>&& rules)
 {
 }
 
-CSSGroupingRule::~CSSGroupingRule()
-{
-}
-
 size_t CSSGroupingRule::insert_rule(StringView, size_t)
 {
     // https://www.w3.org/TR/cssom-1/#insert-a-css-rule

Userland/Libraries/LibWeb/CSS/CSSGroupingRule.h

@@ -19,7 +19,7 @@ class CSSGroupingRule : public CSSRule {
     AK_MAKE_NONMOVABLE(CSSGroupingRule);
 
 public:
-    ~CSSGroupingRule();
+    ~CSSGroupingRule() = default;
 
     CSSRuleList const& css_rules() const { return m_rules; }
     CSSRuleList& css_rules() { return m_rules; }

Userland/Libraries/LibWeb/CSS/CSSImportRule.cpp

@@ -28,10 +28,6 @@ CSSImportRule::CSSImportRule(AK::URL url, DOM::Document& document)
     set_resource(ResourceLoader::the().load_resource(Resource::Type::Generic, request));
 }
 
-CSSImportRule::~CSSImportRule()
-{
-}
-
 // https://www.w3.org/TR/cssom/#serialize-a-css-rule
 String CSSImportRule::serialized() const
 {

Userland/Libraries/LibWeb/CSS/CSSImportRule.h

@@ -26,7 +26,7 @@ public:
         return adopt_ref(*new CSSImportRule(move(url), document));
     }
 
-    ~CSSImportRule();
+    ~CSSImportRule() = default;
 
     const AK::URL& url() const { return m_url; }
 

Userland/Libraries/LibWeb/CSS/CSSMediaRule.cpp

@@ -14,10 +14,6 @@ CSSMediaRule::CSSMediaRule(NonnullRefPtr<MediaList>&& media, NonnullRefPtrVector
 {
 }
 
-CSSMediaRule::~CSSMediaRule()
-{
-}
-
 String CSSMediaRule::condition_text() const
 {
     return m_media->media_text();

Userland/Libraries/LibWeb/CSS/CSSMediaRule.h

@@ -23,7 +23,7 @@ public:
         return adopt_ref(*new CSSMediaRule(move(media_queries), move(rules)));
     }
 
-    ~CSSMediaRule();
+    ~CSSMediaRule() = default;
 
     virtual StringView class_name() const override { return "CSSMediaRule"; };
     virtual Type type() const override { return Type::Media; };

Userland/Libraries/LibWeb/CSS/CSSRule.cpp

@@ -8,10 +8,6 @@
 
 namespace Web::CSS {
 
-CSSRule::~CSSRule()
-{
-}
-
 // https://www.w3.org/TR/cssom/#dom-cssrule-csstext
 String CSSRule::css_text() const
 {

Userland/Libraries/LibWeb/CSS/CSSRule.h

@@ -22,7 +22,7 @@ class CSSRule
 public:
     using WrapperType = Bindings::CSSRuleWrapper;
 
-    virtual ~CSSRule();
+    virtual ~CSSRule() = default;
 
     enum class Type : u32 {
         Style,

Userland/Libraries/LibWeb/CSS/CSSRuleList.cpp

@@ -18,10 +18,6 @@ CSSRuleList::CSSRuleList(NonnullRefPtrVector<CSSRule>&& rules)
 {
 }
 
-CSSRuleList::~CSSRuleList()
-{
-}
-
 bool CSSRuleList::is_supported_property_index(u32 index) const
 {
     // The object’s supported property indices are the numbers in the range zero to one less than the number of CSSRule objects represented by the collection.

Userland/Libraries/LibWeb/CSS/CSSRuleList.h

@@ -27,7 +27,7 @@ public:
     {
         return adopt_ref(*new CSSRuleList(move(rules)));
     }
-    ~CSSRuleList();
+    ~CSSRuleList() = default;
 
     RefPtr<CSSRule> item(size_t index) const
     {

Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.cpp

@@ -16,14 +16,6 @@ PropertyOwningCSSStyleDeclaration::PropertyOwningCSSStyleDeclaration(Vector<Styl
 {
 }
 
-PropertyOwningCSSStyleDeclaration::~PropertyOwningCSSStyleDeclaration()
-{
-}
-
-CSSStyleDeclaration::~CSSStyleDeclaration()
-{
-}
-
 String PropertyOwningCSSStyleDeclaration::item(size_t index) const
 {
     if (index >= m_properties.size())
@@ -43,10 +35,6 @@ ElementInlineCSSStyleDeclaration::ElementInlineCSSStyleDeclaration(DOM::Element&
 {
 }
 
-ElementInlineCSSStyleDeclaration::~ElementInlineCSSStyleDeclaration()
-{
-}
-
 size_t PropertyOwningCSSStyleDeclaration::length() const
 {
     return m_properties.size();

Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.h

@@ -31,7 +31,7 @@ class CSSStyleDeclaration
 public:
     using WrapperType = Bindings::CSSStyleDeclarationWrapper;
 
-    virtual ~CSSStyleDeclaration();
+    virtual ~CSSStyleDeclaration() = default;
 
     virtual size_t length() const = 0;
     virtual String item(size_t index) const = 0;
@@ -49,7 +49,7 @@ public:
     virtual String serialized() const = 0;
 
 protected:
-    CSSStyleDeclaration() { }
+    CSSStyleDeclaration() = default;
 };
 
 class PropertyOwningCSSStyleDeclaration : public CSSStyleDeclaration {
@@ -61,7 +61,7 @@ public:
         return adopt_ref(*new PropertyOwningCSSStyleDeclaration(move(properties), move(custom_properties)));
     }
 
-    virtual ~PropertyOwningCSSStyleDeclaration() override;
+    virtual ~PropertyOwningCSSStyleDeclaration() override = default;
 
     virtual size_t length() const override;
     virtual String item(size_t index) const override;
@@ -88,7 +88,7 @@ class ElementInlineCSSStyleDeclaration final : public PropertyOwningCSSStyleDecl
 public:
     static NonnullRefPtr<ElementInlineCSSStyleDeclaration> create(DOM::Element& element) { return adopt_ref(*new ElementInlineCSSStyleDeclaration(element)); }
     static NonnullRefPtr<ElementInlineCSSStyleDeclaration> create_and_take_properties_from(DOM::Element& element, PropertyOwningCSSStyleDeclaration& declaration) { return adopt_ref(*new ElementInlineCSSStyleDeclaration(element, declaration)); }
-    virtual ~ElementInlineCSSStyleDeclaration() override;
+    virtual ~ElementInlineCSSStyleDeclaration() override = default;
 
     DOM::Element* element() { return m_element.ptr(); }
     const DOM::Element* element() const { return m_element.ptr(); }

Userland/Libraries/LibWeb/CSS/CSSStyleRule.cpp

@@ -15,10 +15,6 @@ CSSStyleRule::CSSStyleRule(NonnullRefPtrVector<Selector>&& selectors, NonnullRef
 {
 }
 
-CSSStyleRule::~CSSStyleRule()
-{
-}
-
 // https://www.w3.org/TR/cssom/#dom-cssstylerule-style
 CSSStyleDeclaration* CSSStyleRule::style()
 {

Userland/Libraries/LibWeb/CSS/CSSStyleRule.h

@@ -27,7 +27,7 @@ public:
         return adopt_ref(*new CSSStyleRule(move(selectors), move(declaration)));
     }
 
-    virtual ~CSSStyleRule() override;
+    virtual ~CSSStyleRule() override = default;
 
     const NonnullRefPtrVector<Selector>& selectors() const { return m_selectors; }
     const CSSStyleDeclaration& declaration() const { return m_declaration; }

Userland/Libraries/LibWeb/CSS/CSSStyleSheet.cpp

@@ -17,10 +17,6 @@ CSSStyleSheet::CSSStyleSheet(NonnullRefPtrVector<CSSRule> rules)
 {
 }
 
-CSSStyleSheet::~CSSStyleSheet()
-{
-}
-
 // https://www.w3.org/TR/cssom/#dom-cssstylesheet-insertrule
 DOM::ExceptionOr<unsigned> CSSStyleSheet::insert_rule(StringView rule, unsigned index)
 {

Userland/Libraries/LibWeb/CSS/CSSStyleSheet.h

@@ -29,7 +29,7 @@ public:
         return adopt_ref(*new CSSStyleSheet(move(rules)));
     }
 
-    virtual ~CSSStyleSheet() override;
+    virtual ~CSSStyleSheet() override = default;
 
     void set_owner_css_rule(CSSRule* rule) { m_owner_css_rule = rule; }
 

Userland/Libraries/LibWeb/CSS/CSSSupportsRule.cpp

@@ -15,10 +15,6 @@ CSSSupportsRule::CSSSupportsRule(NonnullRefPtr<Supports>&& supports, NonnullRefP
 {
 }
 
-CSSSupportsRule::~CSSSupportsRule()
-{
-}
-
 String CSSSupportsRule::condition_text() const
 {
     // FIXME: Serializing supports rules!

Userland/Libraries/LibWeb/CSS/CSSSupportsRule.h

@@ -26,7 +26,7 @@ public:
         return adopt_ref(*new CSSSupportsRule(move(supports), move(rules)));
     }
 
-    ~CSSSupportsRule();
+    ~CSSSupportsRule() = default;
 
     virtual StringView class_name() const override { return "CSSSupportsRule"; };
     virtual Type type() const override { return Type::Supports; };

Userland/Libraries/LibWeb/CSS/MediaList.cpp

@@ -14,10 +14,6 @@ MediaList::MediaList(NonnullRefPtrVector<MediaQuery>&& media)
 {
 }
 
-MediaList::~MediaList()
-{
-}
-
 // https://www.w3.org/TR/cssom-1/#dom-medialist-mediatext
 String MediaList::media_text() const
 {

Userland/Libraries/LibWeb/CSS/MediaList.h

@@ -20,7 +20,7 @@ public:
     {
         return adopt_ref(*new MediaList(move(media)));
     }
-    ~MediaList();
+    ~MediaList() = default;
 
     String media_text() const;
     void set_media_text(String const&);

Userland/Libraries/LibWeb/CSS/MediaQuery.h

@@ -205,7 +205,7 @@ struct MediaCondition {
     String to_string() const;
 
 private:
-    MediaCondition() { }
+    MediaCondition() = default;
     Type type;
     Optional<MediaFeature> feature;
     NonnullOwnPtrVector<MediaCondition> conditions;

Userland/Libraries/LibWeb/CSS/MediaQueryList.cpp

@@ -22,10 +22,6 @@ MediaQueryList::MediaQueryList(DOM::Document& document, NonnullRefPtrVector<Medi
     evaluate();
 }
 
-MediaQueryList::~MediaQueryList()
-{
-}
-
 // https://drafts.csswg.org/cssom-view/#dom-mediaquerylist-media
 String MediaQueryList::media() const
 {

Userland/Libraries/LibWeb/CSS/MediaQueryList.h

@@ -34,7 +34,7 @@ public:
         return adopt_ref(*new MediaQueryList(document, move(media_queries)));
     }
 
-    virtual ~MediaQueryList() override;
+    virtual ~MediaQueryList() override = default;
 
     String media() const;
     bool matches() const;

Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp

@@ -70,11 +70,6 @@ TokenStream<T>::TokenStream(Vector<T> const& tokens)
 {
 }
 
-template<typename T>
-TokenStream<T>::~TokenStream()
-{
-}
-
 template<typename T>
 bool TokenStream<T>::has_next_token()
 {
@@ -164,10 +159,6 @@ Parser::Parser(ParsingContext const& context, StringView input, String const& en
 {
 }
 
-Parser::~Parser()
-{
-}
-
 NonnullRefPtr<CSSStyleSheet> Parser::parse_as_stylesheet()
 {
     return parse_a_stylesheet(m_token_stream);

Userland/Libraries/LibWeb/CSS/Parser/Parser.h

@@ -59,7 +59,7 @@ template<typename T>
 class TokenStream {
 public:
     explicit TokenStream(Vector<T> const&);
-    ~TokenStream();
+    ~TokenStream() = default;
 
     TokenStream(TokenStream<T> const&) = delete;
 
@@ -87,7 +87,7 @@ private:
 class Parser {
 public:
     Parser(ParsingContext const&, StringView input, String const& encoding = "utf-8");
-    ~Parser();
+    ~Parser() = default;
 
     // The normal parser entry point, for parsing stylesheets.
     NonnullRefPtr<CSSStyleSheet> parse_as_stylesheet();

Userland/Libraries/LibWeb/CSS/Parser/StyleRules.cpp

@@ -25,16 +25,16 @@ DeclarationOrAtRule::DeclarationOrAtRule(StyleDeclarationRule declaration)
     , m_declaration(move(declaration))
 {
 }
-DeclarationOrAtRule::~DeclarationOrAtRule() { }
+DeclarationOrAtRule::~DeclarationOrAtRule() = default;
 
 StyleRule::StyleRule(StyleRule::Type type)
     : m_type(type)
 {
 }
-StyleRule::~StyleRule() { }
+StyleRule::~StyleRule() = default;
 
-StyleBlockRule::StyleBlockRule() { }
-StyleBlockRule::~StyleBlockRule() { }
+StyleBlockRule::StyleBlockRule() = default;
+StyleBlockRule::~StyleBlockRule() = default;
 
 StyleComponentValueRule::StyleComponentValueRule(Token token)
     : m_type(StyleComponentValueRule::ComponentType::Token)
@@ -51,10 +51,10 @@ StyleComponentValueRule::StyleComponentValueRule(NonnullRefPtr<StyleBlockRule> b
     , m_block(block)
 {
 }
-StyleComponentValueRule::~StyleComponentValueRule() { }
+StyleComponentValueRule::~StyleComponentValueRule() = default;
 
-StyleDeclarationRule::StyleDeclarationRule() { }
-StyleDeclarationRule::~StyleDeclarationRule() { }
+StyleDeclarationRule::StyleDeclarationRule() = default;
+StyleDeclarationRule::~StyleDeclarationRule() = default;
 
 StyleFunctionRule::StyleFunctionRule(String name)
     : m_name(move(name))
@@ -66,7 +66,7 @@ StyleFunctionRule::StyleFunctionRule(String name, Vector<StyleComponentValueRule
     , m_values(move(values))
 {
 }
-StyleFunctionRule::~StyleFunctionRule() { }
+StyleFunctionRule::~StyleFunctionRule() = default;
 
 template<class SeparatorType, class CollectionType>
 void append_with_to_string(StringBuilder& builder, SeparatorType& separator, CollectionType& collection)

Userland/Libraries/LibWeb/CSS/Percentage.h

@@ -60,7 +60,7 @@ public:
     {
     }
 
-    virtual ~PercentageOr() { }
+    virtual ~PercentageOr() = default;
 
     PercentageOr<T>& operator=(T t)
     {

Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.cpp

@@ -19,10 +19,6 @@ ResolvedCSSStyleDeclaration::ResolvedCSSStyleDeclaration(DOM::Element& element)
 {
 }
 
-ResolvedCSSStyleDeclaration::~ResolvedCSSStyleDeclaration()
-{
-}
-
 size_t ResolvedCSSStyleDeclaration::length() const
 {
     return 0;

Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.h

@@ -17,7 +17,7 @@ public:
         return adopt_ref(*new ResolvedCSSStyleDeclaration(element));
     }
 
-    virtual ~ResolvedCSSStyleDeclaration() override;
+    virtual ~ResolvedCSSStyleDeclaration() override = default;
 
     virtual size_t length() const override;
     virtual String item(size_t index) const override;

Userland/Libraries/LibWeb/CSS/Selector.cpp

@@ -25,10 +25,6 @@ Selector::Selector(Vector<CompoundSelector>&& compound_selectors)
     }
 }
 
-Selector::~Selector()
-{
-}
-
 // https://www.w3.org/TR/selectors-4/#specificity-rules
 u32 Selector::specificity() const
 {

Userland/Libraries/LibWeb/CSS/Selector.h

@@ -132,7 +132,7 @@ public:
         return adopt_ref(*new Selector(move(compound_selectors)));
     }
 
-    ~Selector();
+    ~Selector() = default;
 
     Vector<CompoundSelector> const& compound_selectors() const { return m_compound_selectors; }
     Optional<PseudoElement> pseudo_element() const { return m_pseudo_element; }

Userland/Libraries/LibWeb/CSS/StyleComputer.cpp

@@ -30,10 +30,6 @@ StyleComputer::StyleComputer(DOM::Document& document)
 {
 }
 
-StyleComputer::~StyleComputer()
-{
-}
-
 static StyleSheet& default_stylesheet()
 {
     static StyleSheet* sheet;

Userland/Libraries/LibWeb/CSS/StyleComputer.h

@@ -48,7 +48,7 @@ private:
 class StyleComputer {
 public:
     explicit StyleComputer(DOM::Document&);
-    ~StyleComputer();
+    ~StyleComputer() = default;
 
     DOM::Document& document() { return m_document; }
     DOM::Document const& document() const { return m_document; }

Userland/Libraries/LibWeb/CSS/StyleProperties.cpp

@@ -15,10 +15,6 @@
 
 namespace Web::CSS {
 
-StyleProperties::StyleProperties()
-{
-}
-
 StyleProperties::StyleProperties(const StyleProperties& other)
     : m_property_values(other.m_property_values)
 {

Userland/Libraries/LibWeb/CSS/StyleProperties.h

@@ -18,7 +18,7 @@ namespace Web::CSS {
 
 class StyleProperties : public RefCounted<StyleProperties> {
 public:
-    StyleProperties();
+    StyleProperties() = default;
 
     explicit StyleProperties(const StyleProperties&);
 

Userland/Libraries/LibWeb/CSS/StyleValue.cpp

@@ -23,10 +23,6 @@ StyleValue::StyleValue(Type type)
 {
 }
 
-StyleValue::~StyleValue()
-{
-}
-
 AngleStyleValue const& StyleValue::as_angle() const
 {
     VERIFY(is_angle());

Userland/Libraries/LibWeb/CSS/StyleValue.h

@@ -321,7 +321,7 @@ enum class PointerEvents {
 
 class StyleValue : public RefCounted<StyleValue> {
 public:
-    virtual ~StyleValue();
+    virtual ~StyleValue() = default;
 
     enum class Type {
         Angle,
@@ -539,7 +539,7 @@ public:
     {
         return adopt_ref(*new BackgroundStyleValue(color, image, position, size, repeat, attachment, origin, clip));
     }
-    virtual ~BackgroundStyleValue() override { }
+    virtual ~BackgroundStyleValue() override = default;
 
     size_t layer_count() const { return m_layer_count; }
 
@@ -583,7 +583,7 @@ public:
     {
         return adopt_ref(*new BackgroundRepeatStyleValue(repeat_x, repeat_y));
     }
-    virtual ~BackgroundRepeatStyleValue() override { }
+    virtual ~BackgroundRepeatStyleValue() override = default;
 
     Repeat repeat_x() const { return m_repeat_x; }
     Repeat repeat_y() const { return m_repeat_y; }
@@ -617,7 +617,7 @@ public:
     {
         return adopt_ref(*new BackgroundSizeStyleValue(size_x, size_y));
     }
-    virtual ~BackgroundSizeStyleValue() override { }
+    virtual ~BackgroundSizeStyleValue() override = default;
 
     LengthPercentage size_x() const { return m_size_x; }
     LengthPercentage size_y() const { return m_size_y; }
@@ -653,7 +653,7 @@ public:
     {
         return adopt_ref(*new BorderStyleValue(border_width, border_style, border_color));
     }
-    virtual ~BorderStyleValue() override { }
+    virtual ~BorderStyleValue() override = default;
 
     NonnullRefPtr<StyleValue> border_width() const { return m_border_width; }
     NonnullRefPtr<StyleValue> border_style() const { return m_border_style; }
@@ -684,7 +684,7 @@ public:
     {
         return adopt_ref(*new BorderRadiusStyleValue(horizontal_radius, vertical_radius));
     }
-    virtual ~BorderRadiusStyleValue() override { }
+    virtual ~BorderRadiusStyleValue() override = default;
 
     LengthPercentage const& horizontal_radius() const { return m_horizontal_radius; }
     LengthPercentage const& vertical_radius() const { return m_vertical_radius; }
@@ -725,7 +725,7 @@ public:
     {
         return adopt_ref(*new BoxShadowStyleValue(color, offset_x, offset_y, blur_radius, spread_distance, placement));
     }
-    virtual ~BoxShadowStyleValue() override { }
+    virtual ~BoxShadowStyleValue() override = default;
 
     Color const& color() const { return m_color; }
     Length const& offset_x() const { return m_offset_x; }
@@ -966,7 +966,7 @@ private:
 class ColorStyleValue : public StyleValue {
 public:
     static NonnullRefPtr<ColorStyleValue> create(Color color);
-    virtual ~ColorStyleValue() override { }
+    virtual ~ColorStyleValue() override = default;
 
     Color color() const { return m_color; }
     virtual String to_string() const override;
@@ -996,7 +996,7 @@ public:
     {
         return adopt_ref(*new CombinedBorderRadiusStyleValue(top_left, top_right, bottom_right, bottom_left));
     }
-    virtual ~CombinedBorderRadiusStyleValue() override { }
+    virtual ~CombinedBorderRadiusStyleValue() override = default;
 
     NonnullRefPtr<BorderRadiusStyleValue> top_left() const { return m_top_left; }
     NonnullRefPtr<BorderRadiusStyleValue> top_right() const { return m_top_right; }
@@ -1055,7 +1055,7 @@ public:
     {
         return adopt_ref(*new FlexStyleValue(grow, shrink, basis));
     }
-    virtual ~FlexStyleValue() override { }
+    virtual ~FlexStyleValue() override = default;
 
     NonnullRefPtr<StyleValue> grow() const { return m_grow; }
     NonnullRefPtr<StyleValue> shrink() const { return m_shrink; }
@@ -1086,7 +1086,7 @@ public:
     {
         return adopt_ref(*new FlexFlowStyleValue(flex_direction, flex_wrap));
     }
-    virtual ~FlexFlowStyleValue() override { }
+    virtual ~FlexFlowStyleValue() override = default;
 
     NonnullRefPtr<StyleValue> flex_direction() const { return m_flex_direction; }
     NonnullRefPtr<StyleValue> flex_wrap() const { return m_flex_wrap; }
@@ -1108,7 +1108,7 @@ private:
 class FontStyleValue final : public StyleValue {
 public:
     static NonnullRefPtr<FontStyleValue> create(NonnullRefPtr<StyleValue> font_style, NonnullRefPtr<StyleValue> font_weight, NonnullRefPtr<StyleValue> font_size, NonnullRefPtr<StyleValue> line_height, NonnullRefPtr<StyleValue> font_families) { return adopt_ref(*new FontStyleValue(font_style, font_weight, font_size, line_height, font_families)); }
-    virtual ~FontStyleValue() override { }
+    virtual ~FontStyleValue() override = default;
 
     NonnullRefPtr<StyleValue> font_style() const { return m_font_style; }
     NonnullRefPtr<StyleValue> font_weight() const { return m_font_weight; }
@@ -1172,7 +1172,7 @@ public:
     {
         return adopt_ref(*new IdentifierStyleValue(id));
     }
-    virtual ~IdentifierStyleValue() override { }
+    virtual ~IdentifierStyleValue() override = default;
 
     CSS::ValueID id() const { return m_id; }
 
@@ -1205,7 +1205,7 @@ class ImageStyleValue final
     , public ImageResourceClient {
 public:
     static NonnullRefPtr<ImageStyleValue> create(AK::URL const& url) { return adopt_ref(*new ImageStyleValue(url)); }
-    virtual ~ImageStyleValue() override { }
+    virtual ~ImageStyleValue() override = default;
 
     virtual String to_string() const override;
 
@@ -1230,7 +1230,7 @@ public:
         static NonnullRefPtr<InheritStyleValue> instance = adopt_ref(*new InheritStyleValue);
         return instance;
     }
-    virtual ~InheritStyleValue() override { }
+    virtual ~InheritStyleValue() override = default;
 
     String to_string() const override { return "inherit"; }
 
@@ -1248,7 +1248,7 @@ public:
         static NonnullRefPtr<InitialStyleValue> instance = adopt_ref(*new InitialStyleValue);
         return instance;
     }
-    virtual ~InitialStyleValue() override { }
+    virtual ~InitialStyleValue() override = default;
 
     String to_string() const override { return "initial"; }
 
@@ -1262,7 +1262,7 @@ private:
 class LengthStyleValue : public StyleValue {
 public:
     static NonnullRefPtr<LengthStyleValue> create(Length const&);
-    virtual ~LengthStyleValue() override { }
+    virtual ~LengthStyleValue() override = default;
 
     Length const& length() const { return m_length; }
 
@@ -1300,7 +1300,7 @@ public:
     {
         return adopt_ref(*new ListStyleStyleValue(position, image, style_type));
     }
-    virtual ~ListStyleStyleValue() override { }
+    virtual ~ListStyleStyleValue() override = default;
 
     NonnullRefPtr<StyleValue> position() const { return m_position; }
     NonnullRefPtr<StyleValue> image() const { return m_image; }
@@ -1380,7 +1380,7 @@ public:
     {
         return adopt_ref(*new OverflowStyleValue(overflow_x, overflow_y));
     }
-    virtual ~OverflowStyleValue() override { }
+    virtual ~OverflowStyleValue() override = default;
 
     NonnullRefPtr<StyleValue> overflow_x() const { return m_overflow_x; }
     NonnullRefPtr<StyleValue> overflow_y() const { return m_overflow_y; }
@@ -1405,7 +1405,7 @@ public:
     {
         return adopt_ref(*new PercentageStyleValue(move(percentage)));
     }
-    virtual ~PercentageStyleValue() override { }
+    virtual ~PercentageStyleValue() override = default;
 
     Percentage const& percentage() const { return m_percentage; }
     Percentage& percentage() { return m_percentage; }
@@ -1428,7 +1428,7 @@ public:
     {
         return adopt_ref(*new PositionStyleValue(edge_x, offset_x, edge_y, offset_y));
     }
-    virtual ~PositionStyleValue() override { }
+    virtual ~PositionStyleValue() override = default;
 
     PositionEdge edge_x() const { return m_edge_x; }
     LengthPercentage const& offset_x() const { return m_offset_x; }
@@ -1499,7 +1499,7 @@ public:
     {
         return adopt_ref(*new StringStyleValue(string));
     }
-    virtual ~StringStyleValue() override { }
+    virtual ~StringStyleValue() override = default;
 
     String to_string() const override { return m_string; }
 
@@ -1523,7 +1523,7 @@ public:
     {
         return adopt_ref(*new TextDecorationStyleValue(line, thickness, style, color));
     }
-    virtual ~TextDecorationStyleValue() override { }
+    virtual ~TextDecorationStyleValue() override = default;
 
     NonnullRefPtr<StyleValue> line() const { return m_line; }
     NonnullRefPtr<StyleValue> thickness() const { return m_thickness; }
@@ -1587,7 +1587,7 @@ public:
     {
         return adopt_ref(*new TransformationStyleValue(transform_function, move(values)));
     }
-    virtual ~TransformationStyleValue() override { }
+    virtual ~TransformationStyleValue() override = default;
 
     CSS::TransformFunction transform_function() const { return m_transform_function; }
     NonnullRefPtrVector<StyleValue> values() const { return m_values; }
@@ -1612,7 +1612,7 @@ public:
     {
         return adopt_ref(*new UnresolvedStyleValue(move(values), contains_var));
     }
-    virtual ~UnresolvedStyleValue() override { }
+    virtual ~UnresolvedStyleValue() override = default;
 
     virtual String to_string() const override;
 
@@ -1638,7 +1638,7 @@ public:
         static NonnullRefPtr<UnsetStyleValue> instance = adopt_ref(*new UnsetStyleValue);
         return instance;
     }
-    virtual ~UnsetStyleValue() override { }
+    virtual ~UnsetStyleValue() override = default;
 
     String to_string() const override { return "unset"; }