Solution to overflow:hidden failure in CSS

Cause of failure

Today, when I was writing a carousel, I found that overflow;hidden; could fail. The reason is as follows: if the parent element wants to hide the overflowing absolutely positioned child elements, it needs to add a positioning to the parent element; because the absolutely positioned child elements will look for the positioned parent element from the inside to the outside, and if it can't find it, overflow:hidden; will also fail.

check it out

It is important to repeat, as mentioned above, the reason why overflow:hidden; fails is that if the parent element wants to hide the overflowing absolutely positioned child element, it needs to add a positioning to the parent element; because the absolutely positioned child element will look for the positioned parent element from the inside to the outside, and if it cannot find the parent element, overflow:hidden; will also fail.

Let's try it:

(1)

<style>
    .wrapper{
        width: 200px;
        height: 200px;
        background-color: red;
        overflow: hidden;                 
     }
     .content{
         width: 200px;
         height: 200px;
         background-color: green;
         position: absolute;
         top: 100px;
         left: 100px;
      }
</style>
<body>
     <div class="wrapper">
         <div class="content"></div>
     </div>
</body>

When the child element is absolutely positioned, it is obvious that overflow:hidden; is invalid

(2)

<style>
    .wrapper{
        width: 200px;
        height: 200px;
        background-color: red;
        overflow: hidden;      
        position: relative;           
    }
    .content{
        width: 200px;
        height: 200px;
        background-color: green;
        position: absolute;
        top: 100px;
        left: 100px;
     }
</style>
<body>
    <div class="wrapper">
        <div class="content"></div>
    </div>
</body>

We just need to add a positioning to the parent element, either absolute or relative (but note that if the positioning is absolute, the parent element will affect the elements below the y-axis), so that the absolutely positioned child element can find the parent element, and overflow:hidden; will not fail

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