A virtual teacher who reveals to you the great secrets of Base64

list-style-image

The list-style-image property defines an image as marker of a list element. The image for list-style-image property can be specified as URL-address or as data URI of the image.

For example, you can use a 5x5 GIF image to set a red cross as list item marker:

.base64-url {
  list-style-image: url("//static.base64.guru/uploads/images/5x5.gif")
}

The same can be achieved by encoding image to Base64 and embedding it using data URI:

.base64-data {
  list-style-image: url("data:image/gif;base64,R0lGODdhBQAFAPABAP////8AACwAAAAABQAFAAACCARihhe9q0wBADs=")
}

Both behaviors are identical — when you open the page, your browser displays the same marker for both elements. The difference is that in the first case the browser sends one HTTP request to fetch the external image, when in the second case the image is already loaded in the browser’s memory and it does not need to send any HTTP requests.

Please note that Base64 Data URIs have some limitations. In addition, like almost any unconventional solutions, it has both advantages and disadvantages. Therefore, if you plan to use it, first of all, read about Base64 Data URI.

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