diff --git a/ext/js/dom/document-util.js b/ext/js/dom/document-util.js
index 2dd3c2bc7..638801515 100644
--- a/ext/js/dom/document-util.js
+++ b/ext/js/dom/document-util.js
@@ -498,7 +498,6 @@ function computeCssZoomSupported() {
     return (
         typeof style === 'object' &&
         style !== null &&
-        // @ts-expect-error - zoom is a non-standard property.
         typeof style.zoom === 'string'
     );
 }
diff --git a/ext/js/dom/text-source-generator.js b/ext/js/dom/text-source-generator.js
index e3c6b4e1e..875ecc15e 100644
--- a/ext/js/dom/text-source-generator.js
+++ b/ext/js/dom/text-source-generator.js
@@ -406,7 +406,6 @@ export class TextSourceGenerator {
             return document.caretRangeFromPoint(x, y);
         }
 
-        // @ts-expect-error - caretPositionFromPoint is non-standard
         if (typeof document.caretPositionFromPoint === 'function') {
             // Firefox
             return this._caretPositionFromPoint(x, y);
@@ -422,7 +421,6 @@ export class TextSourceGenerator {
      * @returns {?Range}
      */
     _caretPositionFromPoint(x, y) {
-        // @ts-expect-error - caretPositionFromPoint is non-standard
         const position = /** @type {(x: number, y: number) => ?{offsetNode: Node, offset: number}} */ (document.caretPositionFromPoint)(x, y);
         if (position === null) {
             return null;
@@ -475,7 +473,6 @@ export class TextSourceGenerator {
                     nextElement.style.setProperty('user-select', 'text', 'important');
                 }
 
-                // @ts-expect-error - caretPositionFromPoint is non-standard
                 const position = /** @type {(x: number, y: number) => ?{offsetNode: Node, offset: number}} */ (document.caretPositionFromPoint)(x, y);
                 if (position === null) {
                     return null;