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HTML tutorial: How to use Flexbox for adaptive proportional layout

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Oct 25, 2023 am 11:46 AM

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HTML tutorial: How to use Flexbox for adaptive proportional layout

HTML Tutorial: How to use Flexbox for adaptive proportional layout

In modern web development, responsive layout is attracting more and more attention. Flexbox (flexible box layout) is a powerful layout model in CSS that can help developers easily implement adaptive proportional layout. This article will introduce how to use Flexbox to implement this layout, with specific code examples.

Flexbox is a model based on containers and items. By setting the properties of the container, you can control the layout of the items in the container. The following are some commonly used Flexbox properties:

display: Set the container to a flexible box layout. You can use the property value to be flex or inline-flex. Flex will lay out the child elements of the container as a whole, while inline-flex will lay out the child elements of the container as a row-level element.
flex-direction: Control the arrangement direction of items. You can use the attribute values for row (default value, horizontal arrangement), column (vertical arrangement), row-reverse (reverse horizontal arrangement) and column-reverse ( reverse vertical arrangement).
flex-wrap: Control whether the item wraps. You can use the attribute values to nowrap (default value, no line wrap), wrap (line wrap) and wrap-reverse (reverse line wrap).
justify-content: Control the alignment of the item on the main axis. You can use the attribute values to flex-start (default value, starting point alignment), flex-end (end point alignment), center (center alignment), space -between (justify both ends, equal spacing between items) and space-around (equal spacing around each item).
align-items: Control the alignment of items on the side axis. You can use the attribute values flex-start (start alignment), flex-end (end alignment), center (center alignment), baseline (baseline) Alignment) and stretch (stretch alignment).
align-content: Controls the alignment of multi-line items on the cross axis. This attribute is invalid when there is only one line of items. The available attribute values are the same as align-items.

The following is an actual code example that demonstrates how to use Flexbox for adaptive proportional layout:

<!DOCTYPE html>
<html>
  <head>
    <style>
      .container {
        display: flex;
        flex-wrap: wrap;
        justify-content: space-between;
        align-items: stretch;
        align-content: space-between;
      }

      .item {
        flex: 1 1 30%;
        margin-bottom: 10px;
        background-color: lightblue;
      }
    </style>
  </head>
  <body>
    <div class="container">
      <div class="item">项目1</div>
      <div class="item">项目2</div>
      <div class="item">项目3</div>
      <div class="item">项目4</div>
      <div class="item">项目5</div>
      <div class="item">项目6</div>
    </div>
  </body>
</html>

In the above code example, we create a container (.container ) and multiple items (.item). The container's properties are set to display: flex, which means using Flexbox layout. The attribute of the item is set to flex: 1 1 30%, which means that the enlargement factor of the item is 1, the reduction factor is 1, and it occupies 30% of the width of the container. By setting the properties of the container, we implement adaptive proportional layout.

The above is a simple tutorial on using Flexbox for adaptive proportional layout. I hope it will be helpful to you. Flexbox is a powerful layout model that helps you create responsive web layouts more easily. If you are interested in this, you may wish to further learn and explore more properties and usage of Flexbox.

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