滾動父div時滾動子div

Question

當用戶在父div上滾動時，子應滾動至結束，然後應繼續滾動頁面。

我想這個反向邏輯 Scrolling in child div (fixed) should scroll parent div

但不起作用。請建議如何讓這項工作。

.scrolling-child{ height: 50px; width:400px; border:1px solid green; overflow:scroll; } 
 
.parent { height: 5000px; width:100%; padding: 20px 0; border:1px solid red; overflow:scroll;}

<div class="parent"> 
 
<div class="scrolling-child"> 
 
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Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum. 
 
</div> 
 
</div>

Answer 1

如果我理解正確只需添加位置：固定;到滾動的孩子div。見下文。

.scrolling-child{height: 50px; width:400px; border:1px solid green; overflow:scroll; position:fixed;} 
 

 
.parent {height: 5000px; width:100%; padding: 20px 0; border:1px solid red; }

<div class="parent"> 
 
<div class="scrolling-child"> 
 
Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum. 
 
Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum. 
 
</div> 
 
</div>