HTML tutorial: How to use Flexbox for scalable equal-height, equal-width, equal-spacing layout

HTML Tutorial: How to use Flexbox for scalable equal-height, equal-width, equal-spaced layout

In web development, layout is a very important part. Traditional layout methods may cause many problems, such as inconsistent arrangement of elements on different screen sizes, difficulty in adjusting elements to equal height and width, and difficulty in controlling layout spacing. However, Flexbox (flexible box layout) is a powerful CSS module that can solve these problems and make the layout more flexible and controllable.

The core of Flexbox layout is the flexible container (flex container) and the flexible item (flex item). Flex container refers to the parent element to which Flexbox layout is applied, while flex items are child elements of the parent element. When using Flexbox layout, we can control the arrangement and alignment of child elements in the container by setting the properties of the parent element.

Next, let’s learn how to use Flexbox for scalable equal-height, equal-width, equal-spacing layout. We'll show this with concrete code examples.

First, we need to introduce CSS styles at the head of the HTML document in order to use Flexbox layout. Add the following code in the tag:

<style>
    .flex-container {
        display: flex;
        flex-wrap: wrap;
        justify-content: space-between;
    }
    .flex-item {
        flex-basis: 30%; /* 三个子元素占据容器的30%，总共占据90% */
        height: 200px; /* 所有子元素的高度均为200像素 */
        background-color: #f0f0f0;
        margin-bottom: 20px; /* 子元素之间的间距为20像素 */
    }
</style>

In the tag, we can use the following code to create a three-child Flexible container of elements:

<div class="flex-container">
    <div class="flex-item">Flex item 1</div>
    <div class="flex-item">Flex item 2</div>
    <div class="flex-item">Flex item 3</div>
</div>

The above code creates a flexible container and adds three child elements to the container. Each child element has a .flex-item class name so we can style them all the same.

In the above code, we set the following attributes:

• display: flex;: Indicates that the element is a flexible container.
• flex-wrap: wrap;: Indicates that when the child element exceeds the width of the container, put it into the next line.
• justify-content: space-between;: Indicates that the child elements are evenly distributed in the horizontal space of the container.

In addition, we also set the style of the flexible item, including width, height, background color, spacing, etc.

Through the above code, we can achieve the following effects:

• The three sub-elements occupy 30% of the container, occupying 90% in total.
• The height of all child elements is 200 pixels.
• The spacing between child elements is 20 pixels.

When the browser window size changes, Flexbox layout will automatically adjust the arrangement and width of child elements to adapt to the new screen size.

Summary:
Flexbox layout is a very powerful and flexible layout method that performs well in solving layout problems in web development. In this article, we learned how to use Flexbox to create a scalable, equal-height, equal-width, equal-spaced layout. By properly setting the properties of parent and child elements, we can easily create beautiful web page layouts without relying too much on traditional layout methods. I hope this tutorial is helpful to you, and you are welcome to further learn and explore more features and usage of Flexbox layout.

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