diff --git a/ts/adaptors/HTMLAdaptor.ts b/ts/adaptors/HTMLAdaptor.ts
index 774a2d2e5..c4a20e411 100644
--- a/ts/adaptors/HTMLAdaptor.ts
+++ b/ts/adaptors/HTMLAdaptor.ts
@@ -69,7 +69,7 @@ export interface MinHTMLElement<N, T> {
   className: string;
   classList: DOMTokenList;
   style: OptionList;
-  sheet?: {insertRule: (rule: string) => void};
+  sheet?: {insertRule: (rule: string, index?: number) => void};
 
   childNodes: (N | T)[] | NodeList;
   firstChild: N | T | Node;
@@ -518,7 +518,11 @@ AbstractDOMAdaptor<N, T, D> implements MinHTMLAdaptor<N, T, D> {
    */
   public insertRules(node: N, rules: string[]) {
     for (const rule of rules.reverse()) {
-      node.sheet.insertRule(rule);
+      try {
+        node.sheet.insertRule(rule, 0);
+      } catch (e) {
+        console.warn(`MathJax: can't insert css rule '${rule}': ${e.message}`);
+      }
     }
   }
 
diff --git a/ts/output/chtml/Wrappers/mo.ts b/ts/output/chtml/Wrappers/mo.ts
index d8c80ae22..99e9b5f49 100644
--- a/ts/output/chtml/Wrappers/mo.ts
+++ b/ts/output/chtml/Wrappers/mo.ts
@@ -65,7 +65,8 @@ CommonMoMixin<CHTMLConstructor<any, any, any>>(CHTMLWrapper) {
       width: 'initial'
     },
     'mjx-stretchy-h > mjx-ext': {
-      overflow: 'hidden',
+      '/* IE */ overflow': 'hidden',
+      '/* others */ overflow': 'clip visible',
       width: '100%'
     },
     'mjx-stretchy-h > mjx-ext > mjx-c::before': {
@@ -103,7 +104,8 @@ CommonMoMixin<CHTMLConstructor<any, any, any>>(CHTMLWrapper) {
       height: '100%',
       'box-sizing': 'border-box',
       border: '0px solid transparent',
-      overflow: 'hidden'
+      '/* IE */ overflow': 'hidden',
+      '/* others */ overflow': 'visible clip',
     },
     'mjx-stretchy-v > mjx-ext > mjx-c::before': {
       width: 'initial',