diff --git a/src/browser/public/Terminal.ts b/src/browser/public/Terminal.ts
index 7b2e7ee6..9571afa6 100644
--- a/src/browser/public/Terminal.ts
+++ b/src/browser/public/Terminal.ts
@@ -173,7 +173,7 @@ export class Terminal implements ITerminalApi {
   }
   public registerDecoration(decorationOptions: IDecorationOptions): IDecoration | undefined {
     this._checkProposedApi();
-    this._verifyPositiveInteger(decorationOptions.x);
+    this._verifyPositiveIntegers(decorationOptions.x ?? 0, decorationOptions.width ?? 0, decorationOptions.height ?? 0);
     return this._core.registerDecoration(decorationOptions);
   }
   public addMarker(cursorYOffset: number): IMarker | undefined {
@@ -287,9 +287,11 @@ export class Terminal implements ITerminalApi {
     }
   }
 
-  private _verifyPositiveInteger(value?: number): void {
-    if (value && (value === Infinity || isNaN(value) || value % 1 !== 0 || value < 0)) {
-      throw new Error('This API only accepts positive integers');
+  private _verifyPositiveIntegers(...values: number[]): void {
+    for (const value of values) {
+      if (value && (value === Infinity || isNaN(value) || value % 1 !== 0 || value < 0)) {
+        throw new Error('This API only accepts positive integers');
+      }
     }
   }
 }
diff --git a/src/browser/services/DecorationService.ts b/src/browser/services/DecorationService.ts
index bea34d9a..08e8e9c7 100644
--- a/src/browser/services/DecorationService.ts
+++ b/src/browser/services/DecorationService.ts
@@ -111,6 +111,9 @@ export class Decoration extends Disposable implements IDecoration {
     this._element.style.height = `${this.height * renderService.dimensions.scaledCellHeight}px`;
     this._element.style.top = `${(this.marker.line - bufferService.buffers.active.ydisp) * renderService.dimensions.scaledCellHeight}px`;
 
+    if (this.x && this.x > bufferService.cols) {
+      this._element!.style.display = 'none';
+    }
     if (this.anchor === 'right') {
       this._element.style.right = this.x ? `${this.x * renderService.dimensions.scaledCellWidth}px` : '';
     } else {