html set image size

Method

In web design, it is often necessary to insert pictures into HTML, but sometimes the size of the picture does not match the page layout and needs to be resized. This article will introduce several HTML methods for setting image size to help web designers better master this technique.

1. Use the height and width attributes

In the html code, you can use the height and width attributes to set the height and width of the image. For example, the following code sets the height of the image to 300 pixels and the width to 450 pixels.

<img src="example.jpg" height="300" width="450">

This method is very simple, but its drawback is that it is not flexible enough and may cause problems on different devices because the actual size is fixed.

2. Use the height and width properties of CSS

CSS provides more options to set the size of images and is also more flexible. In CSS code, use the height and width attributes to resize images. For example, the following code can set the height of the image to 300 pixels and the width to adaptive.

<img src="example.jpg" style="height: 300px; width: auto;">

At this time, the width of the image will be adaptively adjusted according to the page layout. If you need to adjust the width, just swap the values ​​of height and width.

3. Use the max-height and max-width attributes

If you want the image to be scaled proportionally and adapt to devices of different sizes, you can use the max-height and max-width attributes. . For example, the following code limits the height and width of an image to 500 pixels.

<img src="example.jpg" style="max-height: 500px; max-width: 500px;">

This method can automatically adjust the image size on different devices, but the scaling ratio may not meet the design requirements.

4. Use flexbox layout

Flexbox is a powerful layout model in CSS3 that can cope with different design needs. Through flexbox layout, you can easily set the size and position of images while adapting to the sizes of different devices. The following is a sample code using flexbox layout:

<div class="container">
  <img src="example.jpg" alt="Example" class="image">
</div>

<style>
  .container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
  }
  
  .image {
    max-width: 100%;
    max-height: 100%;
  }
</style>

This code places the image inside a container and uses flexbox layout to center the image. At the same time, use the max-width and max-height attributes to limit the size of the image to ensure that the image does not exceed the scope of the container.

Summary

The above are several common html methods for setting image size. Just choose the appropriate method according to actual needs. In actual work, it can also be combined with other technologies such as JS to achieve more flexible operations and continuously improve the quality of page design and user experience.

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