Использование свойства overflow css

Momentum-based scrolling on touch devices

Use to use momentum-based scrolling (where supported) on touch devices.

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris eleifend rutrum auctor. Phasellus convallis sagittis augue ut ornare. Vestibulum et gravida lectus, sed ultrices sapien. Nullam aliquet elit dui, vitae hendrerit lectus volutpat eget. In porttitor tincidunt egestas. Pellentesque laoreet ligula at est vulputate facilisis. Etiam tristique justo ut odio placerat ornare. Cras bibendum, orci at ornare tincidunt, lacus nunc gravida enim, sit amet euismod nunc lectus in lectus. Ut dictum nulla et arcu aliquet ornare. Aliquam et dapibus lectus. Aenean mattis elit mi, sed ultricies augue consectetur id. Sed id magna malesuada, luctus urna a, bibendum tortor. Cras cursus cursus ex. Nulla fringilla elit vitae imperdiet scelerisque. Donec ac sem eu diam convallis mollis a sed leo. Proin congue augue turpis, eget rutrum dolor ultricies non. Nulla blandit venenatis dapibus. Sed tincidunt mollis elit, quis suscipit nibh eleifend quis. Donec ex lorem, auctor eu rutrum in, blandit id dolor. Nulla molestie arcu turpis. In id felis vulputate, tempor massa eget, malesuada mauris. Quisque fringilla consequat metus, luctus scelerisque leo fringilla vel.

Use to use normal non-momentum-based scrolling on touch devices.

This is mostly useful for undoing at larger screen sizes.

Scroll vertically if needed

Use to allow vertical scrolling if needed.

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CSS Свойства

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# Declarative Shadow DOM

Shadow DOM, part of the Web Components standard, provides a way to scope CSS styles to a specific DOM subtree and isolate that subtree from the rest of the document. Until now, the only way to use Shadow DOM was to construct a shadow root using JavaScript.

This works fine for client-side rendering, but not so well in server side rendering where there is no built in way to express Shadow Roots in the server generated HTML. But, starting in Chrome 90, with the Declarative Shadow DOM, you’re good to go. You can create shadow roots using only HTML.

A Declarative Shadow Root is a element with a attribute. It’s detected by the HTML parser and immediately applied as the shadow root of its parent element.

Loading the pure HTML markup results in this DOM tree:

This gives us the benefits of Shadow DOM’s encapsulation and slot projection in static HTML. No JavaScript is needed to produce the entire tree, including the Shadow Root.

Check out Declarative Shadow DOM on web.dev for more details.

Scroll in all directions

Use to add scrollbars to an element. Unlike , which only shows scrollbars if they are necessary, this utility always shows them. Note that some operating systems (like macOS) hide unnecessary scrollbars regardless of this setting.

Scroll horizontally when content can’t wrap

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Scroll vertically when content can wrap

Scroll both horizontally and vertically when some content can’t wrap

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What is the overflow-wrap property?

is a CSS property that is used to break a long line of text if it overflows the boundaries of a targeted container element. But, unlike the property, can only be applied on inline elements, such as the paragraph and heading elements.

This property tells the browser that it can break a line of text into multiple lines if it overflows the container. Similarly to the property, also has a set of values that it uses to break texts:

: This is the default value of the property, it will not break text when it overflows its container; instead, the text will break at normal word break points
: This value will break a long line of text into multiple lines from acceptable break points if the text overflows the container
: This value is similar to the value; however, allows long lines of text to be broken at an arbitrary point (even in the middle of a word) if it can’t be broken at an otherwise acceptable point

Here’s an example showing with its the default value:

This example shows with the value:

Here is the same example, but with the value:

What are the overflow-x and overflow-y properties?

The and CSS properties are used to set overflow behaviors on the x-axis and y-axis of a container element.

These properties are much like the property itself. The only difference is that their values are only applied to the horizontal or vertical borders of the container, as opposed to being applied to both axes at the same time.

In the example below, has been applied to the container; as a result, scrollbars are displayed on both the x-axis and the y-axis:

We can control where the scrollbar appears on the container by appending or to the property (note that we are using the value) to display it on either the x-axis or y-axis, respectively:

<div class="container">
  <p class="content">
Lorem ipsum dolor sit amet...
  </p>
</div>

//CSS
.container{
  ...
  Overflow-y: scroll;
  Or
  Overflow-x: scroll;
}

In the below example, we use to display the scrollbar on the vertical axis:

In this example, we use to display the scrollbar on the horizontal axis:

The purpose of values such as is not just to display the scrollbars, but rather to control how they are displayed.

N.B., if content is overflowing from both axes, (i.e., from the container’s right and bottom borders), scrollbars will be displayed on both axes regardless of the property used

CSS overflow visible

Visible is the default value of CSS overflow. It means that not setting the CSS overflow property is the same as setting it to “visible”.

When overflow is visible, the overflowing content will not be clipped. Instead, it will display outside the element’s box and might overlap other elements on the page.

Let’s see a quick example of overflow visible.

HTML:

Enter fullscreen modeExit fullscreen mode

CSS:

Enter fullscreen modeExit fullscreen mode

Output:

In the above example, the p element with the class name “box” has an overflow property set to visible.

As you can notice, there is no difference between the box from the previous example, which doesn’t have any overflow property, and this box which has an overflow property. This is because the overflow property is set to visible by default.

Очистка Float

Как ни странно, одним из наиболее популярных способов использования является очистка свойства .

Проблема встречается в следующем: когда вы помещаете в элемент дочерний элемент с установленным свойством (плавающий), то родительский элемент не растягивается, чтобы охватить дочерний элемент, а сворачивается, не учитывая его. Это бывает проблемой, например, когда у родительского элемента задан фон или рамка.

На примере это наглядно видно. Внутри родительского элемента (в синей рамке) помещен элемент с текстом и установленным свойством . Родительский элемент при этом свернулся.

See the Pen
overflow float by Андрей (@adlibi)
on CodePen.

Элемент с установленным свойством переполнением (любое значение, кроме ) будет расширяться настолько, насколько необходимо, чтобы охватить все дочерние элементы внутри его, которые являются плавающими. Ниже тот же пример, но с установленным для родителя свойством :

See the Pen
overflow float 2 by Андрей (@adlibi)
on CodePen.

Auto

Use to add scrollbars to an element in the event that its content overflows the bounds of that element. Unlike , which always shows scrollbars, this utility will only show them if scrolling is necessary.

How to detect overflow

Horizontal scrolling isn’t always a bad thing. However, when testing for unwanted horizontal scrolling, be on the lookout for anything that makes your layout look or feel like the boundary (usually the right side of your design) isn’t functioning as you would like. In other words, look for extra space or elements hanging off the edge of your design’s boundary as you scroll. You can check for this in the Designer and the published site.

To detect in the Designer whether your project might exhibit unwanted horizontal scrolling:

Open the Designer
Scroll left and right to see if any elements overflow outside the viewport
Grab the edge of the Designer canvas
Resize the canvas to check for responsiveness and fluidity

You can grab the edge of the canvas to resize it and check for responsiveness and fluidity.

Read more about how to make your designs responsive.

To detect unwanted overflow in your published site (especially if you have interactions in place):

Publish your site
Check if your interactions cause unwanted whitespace to the right of your design (especially on mobile devices)

Interactions often cause unwanted whitespace, especially on mobile.

Extra whitespace commonly occurs with interactions because even after the interaction has completed, the browser still thinks the interaction needs the extra width that was used at the start of the animation.

CSS overflow scroll

Setting the overflow value to scroll will hide the overflowing content from rendering outside the element’s box, along with providing scrollbars to view the content.

Note that with setting overflow to scroll, you always get both the horizontal and vertical scrollbars even if the content only requires one or the other.

Let’s look at an example of overflow scroll.

HTML:

Enter fullscreen modeExit fullscreen mode

CSS:

Enter fullscreen modeExit fullscreen mode

Output:

As you can see in the example above, the box has the overflow property set to scroll which gives us the scrollbar in the output.

Краткая справка

Класс	Свойства
overflow-auto	overflow: auto;
overflow-hidden	overflow: hidden;
overflow-clip	overflow: clip;
overflow-visible	overflow: visible;
overflow-scroll	overflow: scroll;
overflow-x-auto	overflow-x: auto;
overflow-y-auto	overflow-y: auto;
overflow-x-hidden	overflow-x: hidden;
overflow-y-hidden	overflow-y: hidden;
overflow-x-clip	overflow-x: clip;
overflow-y-clip	overflow-y: clip;
overflow-x-visible	overflow-x: visible;
overflow-y-visible	overflow-y: visible;
overflow-x-scroll	overflow-x: scroll;
overflow-y-scroll	overflow-y: scroll;

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