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Learn new CSS features: Directional clipping overflow:clip

青灯夜游

Release： 2022-10-11 19:12:09

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This article will introduce a new feature, starting from Chrome 90, a new feature added to overflow - overflow: clip, use it to easily control the overflow direction.

Learn new CSS features: Directional clipping overflow:clip

overflow: clip Why

First, let’s briefly introduce the usage of overflow: clip.

overflow: clip: is very similar to overflow: hidden. It also clips the padding-box of the element. [Learning video sharing: css video tutorial, web front-end]

However, they have two differences:

That is, overflow: clip completely prohibits any form of scrolling internally. Of course, this is not the focus of today, so let’s skip it for now.

##MDN Original text: The difference between clip and hidden is that the clip keyword also forbids all scrolling, including programmatic scrolling.

overflow: clip can control clipping from the x and y axis directions, but overflow: hidden cannot.

The point is this. Let’s briefly illustrate:

overflow: clip && overflow: hidden performance

Let’s look at the performance of not distinguishing directions,

overflow: clip Expression form with overflow: hidden:

<div>
    <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. </p>
</div>
<div class="hidden">
    <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. </p>
</div>
<div class="clip">
    <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. </p>
</div>

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.hidden {
    overflow: hidden;
}
.clip {
    overflow: clip;
}

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We set up 3 DIV containers, one of which does not set overflow, and the other two set

overflow: clip and overflow: hidden. The effect is as follows:

At this time,

overflow: clip behaves the same as overflow: hidden.

overflow: clip `can be set individually on the x/y axis`

However,

overflow: clip is unique The difference is that it can be set to the x-axis or y-axis separately, so that the container has the ability to crop in a certain direction, while allowing overflow in the other direction.

Look at this DEMO:

The phenomenon here is worth noting:

Single settings
overflow -x: hidden or overflow-y: hidden, the expression is consistent with overflow: hidden, which is all-round cropping
And the horizontal x or vertical y direction
overflow-x: clip/ overflow-y: clip matches the other direction overflow-x: visible , but it can allow overflow in one direction and crop in one direction!

Need to explain the above two points:

Setting
overflow: hidden will create a BFC, so there is no way to just Limit one direction; overflow: clip does not create BFC, so they will produce inconsistent phenomena in many performances (for example)
overflow-x/y When set to hidden, overflow-y/x will become auto, even if it is set to visible

For the complete DEMO, you can click here:

CodePen Demo -- overflow: hidden & overflow: clip

At this point, we have achieved such an effect, allowing one-way clipping of elements in the x/y direction, like this:

(The above figure allows overflow in the x-axis direction, while cropping is performed in the y-axis direction)

Cropping in the upper, lower, left, and right directions

OK, then, if we go further. For example, if there is a requirement that overflow is allowed in the upper, left, and right directions, but cropping is required in the lower direction, can this be achieved?

The answer is yes.

There are actually many ways to cut elements in CSS, and the approximate implementation is similar to the function of

overflow: hidden.

For example, we can use

clip-path to achieve single-directional clipping of top, bottom, left, and right. This is the content of my previous article - How to implement overflow: hidden without using overflow: hidden. If you are interested, you can take a look.

Original address: https://www.cnblogs.com/coco1s/p/16627152.html
Author: ChokCoco

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