diff --git a/src/calendar/index.js b/src/calendar/index.js
index 8a0dd9712..31929c68a 100644
--- a/src/calendar/index.js
+++ b/src/calendar/index.js
@@ -171,7 +171,6 @@ export default createComponent({
     this.init();
   },
 
-  /* istanbul ignore next */
   activated() {
     this.init();
   },
diff --git a/src/list/index.js b/src/list/index.js
index cfb38e2e2..b028c4c02 100644
--- a/src/list/index.js
+++ b/src/list/index.js
@@ -42,9 +42,22 @@ export default createComponent({
     // use sync innerLoading state to avoid repeated loading in some edge cases
     const loading = ref(false);
     const root = ref();
-    const placeholderRef = ref();
+    const placeholder = ref();
     const scrollParent = useScrollParent(root);
 
+    const getScrollParentRect = () => {
+      const element = scrollParent.value;
+      if (element.getBoundingClientRect) {
+        return element.getBoundingClientRect();
+      }
+      const height = element.innerHeight;
+      return {
+        top: 0,
+        height,
+        bottom: height,
+      };
+    };
+
     const check = () => {
       nextTick(() => {
         if (loading.value || props.finished || props.error) {
@@ -52,27 +65,14 @@ export default createComponent({
         }
 
         const { offset, direction } = props;
-        let scrollParentRect;
+        const scrollParentRect = getScrollParentRect();
 
-        if (scrollParent.value.getBoundingClientRect) {
-          scrollParentRect = scrollParent.value.getBoundingClientRect();
-        } else {
-          scrollParentRect = {
-            top: 0,
-            bottom: scrollParent.value.innerHeight,
-          };
-        }
-
-        const scrollParentHeight =
-          scrollParentRect.bottom - scrollParentRect.top;
-
-        /* istanbul ignore next */
-        if (!scrollParentHeight || isHidden(root)) {
+        if (!scrollParentRect.height || isHidden(root)) {
           return false;
         }
 
         let isReachEdge = false;
-        const placeholderRect = useRect(placeholderRef);
+        const placeholderRect = useRect(placeholder);
 
         if (direction === 'up') {
           isReachEdge = scrollParentRect.top - placeholderRect.top <= offset;
@@ -148,9 +148,7 @@ export default createComponent({
 
     return () => {
       const Content = slots.default?.();
-      const Placeholder = (
-        <div ref={placeholderRef} class={bem('placeholder')} />
-      );
+      const Placeholder = <div ref={placeholder} class={bem('placeholder')} />;
 
       return (
         <div ref={root} role="feed" class={bem()} aria-busy={loading.value}>
diff --git a/src/utils/dom/event.ts b/src/utils/dom/event.ts
index baaf9de3e..f65745cc7 100644
--- a/src/utils/dom/event.ts
+++ b/src/utils/dom/event.ts
@@ -9,7 +9,6 @@ if (inBrowser) {
     Object.defineProperty(opts, 'passive', {
       // eslint-disable-next-line getter-return
       get() {
-        /* istanbul ignore next */
         supportsPassive = true;
       },
     });
diff --git a/src/utils/dom/raf.ts b/src/utils/dom/raf.ts
index ca7bc1b42..e87308dbb 100644
--- a/src/utils/dom/raf.ts
+++ b/src/utils/dom/raf.ts
@@ -6,7 +6,6 @@ import { inBrowser } from '..';
 
 let prev = Date.now();
 
-/* istanbul ignore next */
 function fallback(fn: FrameRequestCallback): number {
   const curr = Date.now();
   const ms = Math.max(0, 16 - (curr - prev));
@@ -15,13 +14,10 @@ function fallback(fn: FrameRequestCallback): number {
   return id;
 }
 
-/* istanbul ignore next */
 const root = (inBrowser ? window : global) as Window;
 
-/* istanbul ignore next */
 const iRaf = root.requestAnimationFrame || fallback;
 
-/* istanbul ignore next */
 const iCancel = root.cancelAnimationFrame || root.clearTimeout;
 
 export function raf(fn: FrameRequestCallback): number {
diff --git a/src/utils/dom/reset-scroll.ts b/src/utils/dom/reset-scroll.ts
index 8cdf18a40..acf27992a 100644
--- a/src/utils/dom/reset-scroll.ts
+++ b/src/utils/dom/reset-scroll.ts
@@ -8,7 +8,6 @@ import { getRootScrollTop, setRootScrollTop } from './scroll';
 
 const isIOS = checkIsIOS();
 
-/* istanbul ignore next */
 export function resetScroll() {
   if (isIOS) {
     setRootScrollTop(getRootScrollTop());
diff --git a/src/utils/validate/system.ts b/src/utils/validate/system.ts
index bab22ad2d..ec0331241 100644
--- a/src/utils/validate/system.ts
+++ b/src/utils/validate/system.ts
@@ -1,12 +1,10 @@
 import { inBrowser } from '..';
 
 export function isAndroid(): boolean {
-  /* istanbul ignore next */
   return inBrowser ? /android/.test(navigator.userAgent.toLowerCase()) : false;
 }
 
 export function isIOS(): boolean {
-  /* istanbul ignore next */
   return inBrowser
     ? /ios|iphone|ipad|ipod/.test(navigator.userAgent.toLowerCase())
     : false;