diff --git a/files/en-us/web/api/dommatrix/multiplyself/index.md b/files/en-us/web/api/dommatrix/multiplyself/index.md
index 0f9e057ba2cb274..a24146a40587301 100644
--- a/files/en-us/web/api/dommatrix/multiplyself/index.md
+++ b/files/en-us/web/api/dommatrix/multiplyself/index.md
@@ -15,13 +15,13 @@ To multiply a matrix without mutating it, see {{domxref("DOMMatrixReadOnly.multi
 ## Syntax
 
 ```js-nolint
-  DOMMatrix.multiplySelf( )
-  DOMMatrix.multiplySelf( otherMatrix )
+  DOMMatrix.multiplySelf()
+  DOMMatrix.multiplySelf(otherMatrix)
 ```
 
 ### Parameters
 
-- `otherMatrix`
+- `otherMatrix` {{optional_inline}}
   - : The [`DOMMatrix`](/en-US/docs/Web/API/DOMMatrix) multiplier.
 
 ### Return value
diff --git a/files/en-us/web/api/dommatrix/premultiplyself/index.md b/files/en-us/web/api/dommatrix/premultiplyself/index.md
index 1332be663a5d20a..3faf6c045298a47 100644
--- a/files/en-us/web/api/dommatrix/premultiplyself/index.md
+++ b/files/en-us/web/api/dommatrix/premultiplyself/index.md
@@ -13,13 +13,13 @@ The **`preMultiplySelf()`** method of the {{domxref("DOMMatrix")}} interface mod
 ## Syntax
 
 ```js-nolint
-  DOMMatrix.preMultiplySelf( )
-  DOMMatrix.preMultiplySelf( otherMatrix )
+  DOMMatrix.preMultiplySelf()
+  DOMMatrix.preMultiplySelf(otherMatrix)
 ```
 
 ### Parameters
 
-- `otherMatrix`
+- `otherMatrix` {{optional_inline}}
   - : The [`DOMMatrix`](/en-US/docs/Web/API/DOMMatrix) multiplier.
 
 ### Return value
diff --git a/files/en-us/web/api/dommatrixreadonly/multiply/index.md b/files/en-us/web/api/dommatrixreadonly/multiply/index.md
index 43dc191867437e4..a331fda5e96478b 100644
--- a/files/en-us/web/api/dommatrixreadonly/multiply/index.md
+++ b/files/en-us/web/api/dommatrixreadonly/multiply/index.md
@@ -15,13 +15,13 @@ To mutate the matrix as you multiply it, see {{domxref("DOMMatrix.multiplySelf()
 ## Syntax
 
 ```js-nolint
-  DOMMatrixReadOnly.multiply( )
-  DOMMatrixReadOnly.multiply( otherMatrix )
+  DOMMatrixReadOnly.multiply()
+  DOMMatrixReadOnly.multiply(otherMatrix)
 ```
 
 ### Parameters
 
-- `otherMatrix`
+- `otherMatrix` {{optional_inline}}
   - : The [`DOMMatrix`](/en-US/docs/Web/API/DOMMatrix) multiplier.
 
 ### Return value