-sd-animation: sd-fadeIn; –sd-duration: 0ms; –sd-easing: ease-in;

It looks like your message cut off after the HTML span. Do you want:

1. a description of postcards with an explanation of the HTML attribute data-sd-animate,
2. guidance on how to animate postcards on a webpage using data-sd-animate, or
3. something else (please finish the sentence)?

Pick 1, 2, or 3 and I’ll proceed.