diff --git a/src/mdast.rs b/src/mdast.rs
index 4d95fa0..aec1eae 100644
--- a/src/mdast.rs
+++ b/src/mdast.rs
@@ -515,7 +515,7 @@ pub struct Root {
     /// Content model.
     pub children: Vec<Node>,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
 }
 
@@ -532,7 +532,7 @@ pub struct Paragraph {
     /// Content model.
     pub children: Vec<Node>,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
 }
 
@@ -549,7 +549,7 @@ pub struct Heading {
     /// Content model.
     pub children: Vec<Node>,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
     // Extra.
     /// Rank (between `1` and `6`, both including).
@@ -567,7 +567,7 @@ pub struct Heading {
 pub struct ThematicBreak {
     // Void.
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
 }
 
@@ -584,7 +584,7 @@ pub struct Blockquote {
     /// Content model.
     pub children: Vec<Node>,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
 }
 
@@ -601,14 +601,14 @@ pub struct List {
     /// Content model.
     pub children: Vec<Node>,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
     // Extra.
     /// Ordered (`true`) or unordered (`false`).
     pub ordered: bool,
     /// Starting number of the list.
     /// `None` when unordered.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub start: Option<u32>,
     /// One or more of its children are separated with a blank line from its
     /// siblings (when `true`), or not (when `false`).
@@ -628,7 +628,7 @@ pub struct ListItem {
     /// Content model.
     pub children: Vec<Node>,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
     // Extra.
     /// The item contains two or more children separated by a blank line
@@ -636,7 +636,7 @@ pub struct ListItem {
     pub spread: bool,
     /// GFM: whether the item is done (when `true`), not done (when `false`),
     /// or indeterminate or not applicable (`None`).
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub checked: Option<bool>,
 }
 
@@ -653,7 +653,7 @@ pub struct Html {
     /// Content model.
     pub value: String,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
 }
 
@@ -674,14 +674,14 @@ pub struct Code {
     /// Content model.
     pub value: String,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
     // Extra.
     /// The language of computer code being marked up.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub lang: Option<String>,
     /// Custom info relating to the node.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub meta: Option<String>,
 }
 
@@ -702,11 +702,11 @@ pub struct Math {
     /// Content model.
     pub value: String,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
     // Extra.
     /// Custom info relating to the node.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub meta: Option<String>,
 }
 
@@ -721,14 +721,14 @@ pub struct Math {
 pub struct Definition {
     // Void.
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
     // Resource.
     /// URL to the referenced resource.
     pub url: String,
     /// Advisory info for the resource, such as something that would be
     /// appropriate for a tooltip.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub title: Option<String>,
     // Association.
     /// Value that can match another node.
@@ -742,7 +742,7 @@ pub struct Definition {
     /// To normalize a value, collapse markdown whitespace (`[\t\n\r ]+`) to a
     /// space, trim the optional initial and/or final space, and perform
     /// case-folding.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub label: Option<String>,
 }
 
@@ -759,7 +759,7 @@ pub struct Text {
     /// Content model.
     pub value: String,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
 }
 
@@ -776,7 +776,7 @@ pub struct Emphasis {
     /// Content model.
     pub children: Vec<Node>,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
 }
 
@@ -793,7 +793,7 @@ pub struct Strong {
     /// Content model.
     pub children: Vec<Node>,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
 }
 
@@ -810,7 +810,7 @@ pub struct InlineCode {
     /// Content model.
     pub value: String,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
 }
 
@@ -827,7 +827,7 @@ pub struct InlineMath {
     /// Content model.
     pub value: String,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
 }
 
@@ -843,7 +843,7 @@ pub struct InlineMath {
 pub struct Break {
     // Void.
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
 }
 
@@ -860,14 +860,14 @@ pub struct Link {
     /// Content model.
     pub children: Vec<Node>,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
     // Resource.
     /// URL to the referenced resource.
     pub url: String,
     /// Advisory info for the resource, such as something that would be
     /// appropriate for a tooltip.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub title: Option<String>,
 }
 
@@ -882,7 +882,7 @@ pub struct Link {
 pub struct Image {
     // Void.
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
     // Alternative.
     /// Equivalent content for environments that cannot represent the node as
@@ -893,7 +893,7 @@ pub struct Image {
     pub url: String,
     /// Advisory info for the resource, such as something that would be
     /// appropriate for a tooltip.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub title: Option<String>,
 }
 
@@ -910,7 +910,7 @@ pub struct LinkReference {
     /// Content model.
     pub children: Vec<Node>,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
     // Reference.
     /// Explicitness of a reference.
@@ -928,7 +928,7 @@ pub struct LinkReference {
     /// To normalize a value, collapse markdown whitespace (`[\t\n\r ]+`) to a
     /// space, trim the optional initial and/or final space, and perform
     /// case-folding.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub label: Option<String>,
 }
 
@@ -943,7 +943,7 @@ pub struct LinkReference {
 pub struct ImageReference {
     // Void.
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
     // Alternative.
     /// Equivalent content for environments that cannot represent the node as
@@ -965,7 +965,7 @@ pub struct ImageReference {
     /// To normalize a value, collapse markdown whitespace (`[\t\n\r ]+`) to a
     /// space, trim the optional initial and/or final space, and perform
     /// case-folding.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub label: Option<String>,
 }
 
@@ -982,7 +982,7 @@ pub struct FootnoteDefinition {
     /// Content model.
     pub children: Vec<Node>,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
     // Association.
     /// Value that can match another node.
@@ -996,7 +996,7 @@ pub struct FootnoteDefinition {
     /// To normalize a value, collapse markdown whitespace (`[\t\n\r ]+`) to a
     /// space, trim the optional initial and/or final space, and perform
     /// case-folding.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub label: Option<String>,
 }
 
@@ -1011,7 +1011,7 @@ pub struct FootnoteDefinition {
 pub struct FootnoteReference {
     // Void.
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
     // Association.
     /// Value that can match another node.
@@ -1025,7 +1025,7 @@ pub struct FootnoteReference {
     /// To normalize a value, collapse markdown whitespace (`[\t\n\r ]+`) to a
     /// space, trim the optional initial and/or final space, and perform
     /// case-folding.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub label: Option<String>,
 }
 
@@ -1044,7 +1044,7 @@ pub struct Table {
     /// Content model.
     pub children: Vec<Node>,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
     // Extra.
     /// Represents how cells in columns are aligned.
@@ -1064,7 +1064,7 @@ pub struct TableRow {
     /// Content model.
     pub children: Vec<Node>,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
 }
 
@@ -1081,7 +1081,7 @@ pub struct TableCell {
     /// Content model.
     pub children: Vec<Node>,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
 }
 
@@ -1098,7 +1098,7 @@ pub struct Delete {
     /// Content model.
     pub children: Vec<Node>,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
 }
 
@@ -1119,7 +1119,7 @@ pub struct Yaml {
     /// Content model.
     pub value: String,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
 }
 
@@ -1140,7 +1140,7 @@ pub struct Toml {
     /// Content model.
     pub value: String,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
 }
 
@@ -1157,7 +1157,7 @@ pub struct MdxjsEsm {
     /// Content model.
     pub value: String,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
 
     // Custom data on where each slice of `value` came from.
@@ -1177,7 +1177,7 @@ pub struct MdxFlowExpression {
     /// Content model.
     pub value: String,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
 
     // Custom data on where each slice of `value` came from.
@@ -1197,7 +1197,7 @@ pub struct MdxTextExpression {
     /// Content model.
     pub value: String,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
 
     // Custom data on where each slice of `value` came from.
@@ -1221,13 +1221,13 @@ pub struct MdxJsxFlowElement {
     /// Content model.
     pub children: Vec<Node>,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
     // JSX element.
     /// Name.
     ///
     /// Fragments have no name.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub name: Option<String>,
     /// Attributes.
     pub attributes: Vec<AttributeContent>,
@@ -1250,13 +1250,13 @@ pub struct MdxJsxTextElement {
     /// Content model.
     pub children: Vec<Node>,
     /// Positional info.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub position: Option<Position>,
     // JSX element.
     /// Name.
     ///
     /// Fragments have no name.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub name: Option<String>,
     /// Attributes.
     pub attributes: Vec<AttributeContent>,
@@ -1281,7 +1281,7 @@ pub struct MdxJsxAttribute {
     /// Key.
     pub name: String,
     /// Value.
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub value: Option<AttributeValue>,
 }