diff --git a/testsuite/tests/input/tex/Base.test.ts b/testsuite/tests/input/tex/Base.test.ts
index 7b70ffabe..90b91edd7 100644
--- a/testsuite/tests/input/tex/Base.test.ts
+++ b/testsuite/tests/input/tex/Base.test.ts
@@ -2503,7 +2503,7 @@ describe('MmlToken', () => {
 
   it('Token Invalid Attribute', () => {
     expectTexError('\\mmlToken{mi}[m1=true]{}')
-      .toBe('Invalid MathML attribute: m1=true');
+      .toBe('Invalid MathML attribute: m1');
   });
 
   /********************************************************************************/
diff --git a/testsuite/tests/input/tex/Noerrors.test.ts b/testsuite/tests/input/tex/Noerrors.test.ts
index dfc87d3d3..ddadeef37 100644
--- a/testsuite/tests/input/tex/Noerrors.test.ts
+++ b/testsuite/tests/input/tex/Noerrors.test.ts
@@ -288,7 +288,7 @@ describe('NoError', () => {
     toXmlMatch(
       tex2mml('\\mmlToken{mi}[m1=true]{}'),
       `<math xmlns="http://www.w3.org/1998/Math/MathML" data-latex="\\mmlToken{mi}[m1=true]{}" display="block">
-         <merror data-mjx-error="Invalid MathML attribute: m1=true" title="Invalid MathML attribute: m1=true">
+         <merror data-mjx-error="Invalid MathML attribute: m1" title="Invalid MathML attribute: m1">
            <mtext>\\mmlToken{mi}[m1=true]{}</mtext>
          </merror>
        </math>`
diff --git a/ts/adaptors/HTMLAdaptor.ts b/ts/adaptors/HTMLAdaptor.ts
index c1a9d68dc..b5d4799df 100644
--- a/ts/adaptors/HTMLAdaptor.ts
+++ b/ts/adaptors/HTMLAdaptor.ts
@@ -463,6 +463,9 @@ export class HTMLAdaptor<
    */
   public setAttribute(node: N, name: string, value: string, ns: string = null) {
     if (!ns) {
+      if (name === 'style') {
+        value = value.replace(/\n/g, ' ');
+      }
       return node.setAttribute(name, value);
     }
     name = ns.replace(/.*\//, '') + ':' + name.replace(/^.*:/, '');
@@ -538,14 +541,14 @@ export class HTMLAdaptor<
    * @override
    */
   public setStyle(node: N, name: string, value: string) {
-    (node.style as OptionList)[name] = value;
+    node.style[name] = String(value).replace(/\n/g, ' ');
   }
 
   /**
    * @override
    */
   public getStyle(node: N, name: string) {
-    return (node.style as OptionList)[name];
+    return node.style[name];
   }
 
   /**
diff --git a/ts/input/tex/base/BaseMethods.ts b/ts/input/tex/base/BaseMethods.ts
index 206452de8..88e1c73e3 100644
--- a/ts/input/tex/base/BaseMethods.ts
+++ b/ts/input/tex/base/BaseMethods.ts
@@ -1089,14 +1089,14 @@ const BaseMethods: { [key: string]: ParseMethod } = {
     }
     while (attr !== '') {
       const match = attr.match(
-        /^([a-z]+)\s*=\s*('[^']*'|"[^"]*"|[^ ,]*)\s*,?\s*/i
+        /^([a-z]+)\s*=\s*('[^'\n]*'|"[^"\n]*"|[^ ,\n]*)[\s\n]*,?[\s\n]*/i
       );
       if (!match) {
         // @test Token Invalid Attribute
         throw new TexError(
           'InvalidMathMLAttr',
           'Invalid MathML attribute: %1',
-          attr
+          attr.split(/[\s\n=]/)[0]
         );
       }
       if (!node.attributes.hasDefault(match[1]) && !MmlTokenAllow[match[1]]) {
diff --git a/ts/util/Styles.ts b/ts/util/Styles.ts
index 63042926b..13905e355 100644
--- a/ts/util/Styles.ts
+++ b/ts/util/Styles.ts
@@ -56,7 +56,7 @@ export const WSC = ['width', 'style', 'color'];
  * @returns {string[]}    Array of parts of the style (separated by spaces)
  */
 function splitSpaces(text: string): string[] {
-  const parts = text.split(/((?:'[^']*'|"[^"]*"|,[\s\n]|[^\s\n])*)/g);
+  const parts = text.split(/((?:'[^'\n]*'|"[^"\n]*"|,[\s\n]|[^\s\n])*)/g);
   const split = [] as string[];
   while (parts.length > 1) {
     parts.shift();