30秒学会 CSS 片段 – Fallback for images that fail to load

Displays an error message when an image fails to load.

• Apply styles to the img element as if it was a text container.
• Use the ::before and ::after pseudo-elements to display an error message and the image URL. These elements will only be displayed if the image fails to load.

预览

在 CodePen 中编辑

HTML

<img src="https://nowhere.to.be/found.jpg" />

CSS

img {
  display: block;
  font-family: sans-serif;
  font-weight: 300;
  height: auto;
  line-height: 2;
  position: relative;
  text-align: center;
  width: 100%;
}

img::before {
  content: "Sorry, this image is unavailable.";
  display: block;
  margin-bottom: 8px;
}

img::after {
  content: "(url: " attr(src) ")";
  display: block;
  font-size: 12px;
}

翻译自：https://www.30secondsofcode.org/css/s/broken-image-fallback