使用<picture>元素結(jié)合和<img src="/static/imghw/default1.png" data-src="small.jpg" class="lazy" alt="如何將元素用于響應(yīng)圖像？" >標(biāo)簽可創(chuàng)建響應(yīng)式圖片，實(shí)現(xiàn)基于屏幕尺寸或像素密度的多條件控制。1. <picture>作為容器包含多個(gè)和一個(gè)<img src="/static/imghw/default1.png" data-src="small.jpg" class="lazy" alt="如何將元素用于響應(yīng)圖像？" >，瀏覽器按匹配條件加載首個(gè)適用圖像；2. 使用srcset與sizes屬性提升靈活性，讓瀏覽器根據(jù)視口大小選擇合適圖像；3. 通過<picture>提供WebP格式并回退至JPEG以兼顧性能與兼容性。示例包括：大屏加載large.jpg，中等屏加載medium.jpg，小屏加載small.jpg，確保不同設(shè)備優(yōu)化加載體驗(yàn)。

You use the <picture></picture> element along with <source></source> and <img src="/static/imghw/default1.png" data-src="small.jpg" class="lazy" alt="如何將元素用于響應(yīng)圖像？" > tags to create responsive images. It gives you more control over which image is displayed under different conditions, like screen size or pixel density.

Use <picture></picture> for Multiple Image Sources

The <picture></picture> element works as a container that holds multiple <source></source> elements and one <img src="/static/imghw/default1.png" data-src="small.jpg" class="lazy" alt="如何將元素用于響應(yīng)圖像？" > tag. Browsers will go through each <source></source> and load the first one that matches the specified condition.

For example:

<picture>
  <source media="(min-width: 800px)" srcset="large.jpg">
  <source media="(min-width: 400px)" srcset="medium.jpg">
  <img src="/static/imghw/default1.png"  data-src="small.jpg"  class="lazy" alt="Description of image">
</picture>

In this case:

• On screens wider than 800px, large.jpg will show.
• Between 400px and 799px, medium.jpg is used.
• Anything smaller gets small.jpg.

This helps you serve lighter images on smaller devices, improving performance.

Use srcset and sizes in <img src="/static/imghw/default1.png" data-src="image-320w.jpg" class="lazy" alt="如何將元素用于響應(yīng)圖像？" > for Flexible Images

Even without <picture>, you can make an image responsive using just the <img src="/static/imghw/default1.png" data-src="image-320w.jpg" class="lazy" alt="如何將元素用于響應(yīng)圖像？" > tag with srcset and sizes.

• srcset lists different image files and their width (e.g., image-320w.jpg 320w)
• sizes tells the browser how wide the image will be at different breakpoints

Example:

<img src="/static/imghw/default1.png"  data-src="image-320w.jpg"  class="lazy"  
  srcset="image-320w.jpg 320w,
          image-480w.jpg 480w,
          image-800w.jpg 800w"
  sizes="(min-width: 600px) 600px, 100vw"
  alt="Responsive image example">

This way, the browser picks the best image based on the viewport size and device pixel ratio.

Consider Using WebP Format and Fallbacks

WebP offers better compression and quality than JPEG or PNG, but not all browsers support it. You can use <picture> to offer WebP when possible and fall back to JPEG otherwise.

<picture>
  <source srcset="image.webp" type="image/webp">
  <img src="/static/imghw/default1.png"  data-src="image.jpg"  class="lazy" alt="Fallback to JPG">
</picture>

This setup improves page speed without sacrificing compatibility.

That's basically how you handle responsive images with HTML. It’s not too complicated once you get the pattern down, but easy to miss a detail like missing fallbacks or incorrect sizes.

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