What is the role of overflow?

The functions of overflow include controlling the display of overflow content, preventing overflow content from affecting the layout, achieving scrolling effects and hiding effects, etc. Detailed introduction: 1. Control the display of overflow content. By setting the overflow attribute, you can decide whether the overflow content is displayed outside the element, hidden, displayed with scroll bars, or cropped. This can effectively control the layout and visibility of elements on the page; 2. Prevent overflow content from affecting the layout. When the content exceeds the size of the element, if it is not processed, it may cause disordered page layout and so on.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

In CSS, overflow is a property used to control the overflow content of an element. When the content of an element exceeds its specified size, the overflow attribute determines how to handle the overflow content. The overflow attribute has the following possible values:

1. visible: default value. When content exceeds the dimensions of an element, the overflowed content appears outside the element and may cover other elements. In this case, the overflowing content will not be clipped and will affect the layout of the page.

2. hidden: When the content exceeds the size of the element, the overflowing content will be cropped and not displayed outside the element. This can hide overflowing content and avoid affecting the layout of the page.

3. scroll: When the content exceeds the size of the element, a scroll bar will be displayed, and the user can use the scroll bar to view the overflowing content. Even if the content does not exceed the dimensions of the element, a hidden scroll bar is displayed and the user can scroll through it.

4. auto: When the content exceeds the size of the element, it will automatically choose to display the scroll bar or hide the overflowing content as needed. If the content does not exceed the dimensions of the element, no scroll bars are displayed. In this case, the scroll bar will be displayed when the content exceeds the content, otherwise the scroll bar will not be displayed.

In addition to the above four values, there is also a value of clip. The clip value will clip the overflow content of the element and not display it outside the element. In this case, the overflowing content will be clipped and will not be displayed outside the element.

The overflow attribute is usually used for container elements with fixed sizes, such as div or p, etc. By setting the overflow attribute, you can control how the content in the container element behaves when it overflows.

Using the overflow attribute can achieve the following functions:

1. Control the display of overflow content: By setting the overflow attribute, you can decide whether the overflow content is displayed outside the element, hidden, or hidden. Show scrollbars or cropping. This effectively controls the layout and visibility of elements on the page.

2. Prevent overflow content from affecting the layout: When the content exceeds the size of the element, if it is not processed, the page layout may be disordered. By setting the overflow attribute to hidden or scroll, you can prevent overflowing content from affecting the layout of other elements.

3. Implement scrolling effect: By setting the overflow attribute to scroll, the scroll bar can be displayed when the content overflows, allowing users to scroll to view the content. This is useful when the container element contains a lot of text or images.

4. Achieve hiding effect: By setting the overflow attribute to hidden, you can hide the overflow content in the element so that it is not displayed outside the element. This is useful when you need to hide overflow content or implement some special effects.

It should be noted that the overflow attribute only works on elements with specified sizes. For elements without specified dimensions, such as inline elements or block-level elements with no set width and height, the overflow attribute has no effect.

In actual development, the overflow attribute is often used to deal with text overflow, image overflow, etc. For example, you can use the overflow attribute to limit the display of text within a specified area to prevent text overflow from affecting the page layout.

In addition, the overflow attribute can also be used in combination with other attributes, such as overflow-x and overflow-y to control the horizontal and vertical overflow of elements respectively. You can also control the way text wraps by setting the overflow-wrap or word-wrap attributes.

To summarize, the overflow property in CSS is used to control how the overflow content of an element is displayed. By setting different values, you can decide whether the overflow content is displayed outside the element, hidden, displayed with scroll bars, or cropped. Proper use of the overflow attribute can handle element overflow and improve page usability and user experience.

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