To create a responsive picture gallery, the core is to use HTML5 and CSS to achieve adaptation of structure and layout. 1. Use

To be a responsive picture gallery, the core is to enable pictures to automatically adjust layout and size according to the screen size, while maintaining aesthetics and usability. HTML5 itself provides some basic support, but implementing responsiveness depends more on the flexible layout of CSS and media queries.

Structured content using <figure></figure> and <figcaption></figcaption>

HTML5 provides <figure></figure> and <figcaption></figcaption> tags, which are ideal for organizing images and their descriptive text. This not only makes the semantics clear, but also makes it easier to use CSS to control styles later.

For example:

 <figure>
  <img src="/static/imghw/default1.png"  data-src="image1.jpg"  class="lazy" alt="How to make a responsive image gallery with HTML5?">
  <figcaption>Beautiful natural scenery</figcaption>
</figure>

This structure is common in picture galleries, especially if you want each picture to have a title or description. Using these tags can also help search engines better understand page content.

Layout the gallery using CSS Grid or Flexbox

To make the picture gallery display well on different devices, it is recommended to use CSS Grid or Flexbox for layout. Both can implement responsive arrangements, where Grid is more suitable for two-dimensional layouts (row and column control), and Flexbox is more suitable for one-dimensional arrangements (such as horizontal or vertical arrangement).

For example, use Grid to implement a responsive three-column layout:

 .gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
}

The meaning of this code is: automatically adjust the number of columns, each image item has a minimum of 250px, a maximum of one row, and a spacing of 1 rem. This will become single column on the phone, double column on the tablet, three columns on the desktop or even more.

If you are more familiar with Flexbox, you can also write this:

 .gallery {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.gallery img {
  flex: 1 1 calc(33.333% - 1rem);
}

However, this method requires manual calculation of width, which is not as flexible as Grid.

The picture itself must be processed responsively

It is not enough to have layout alone, and the picture itself also needs to be responsive. All images can be styled as follows:

 img {
  width: 100%;
  height: auto;
  display: block;
}

This way the image will scale with the container and will not deform or overflow. If you want to unify the height, you can also add padding or object-fit:

 img {
  object-fit: cover;
  height: 200px;
}

This way the picture will be cropped and filled the entire area, making the visual effect more neat.

Also, don't forget to set the alt attribute, which is important for both accessibility and SEO.

Basically that's it. The structure is HTML5 tag, the layout is Grid or Flexbox, and the image controls the width and height and adaptation methods. Not complicated but easily overlooked are details, such as small tips such as gap , minmax and object-fit Master them well and your picture gallery will be both beautiful and practical.

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