-sd-animation: sd-fadeIn; –sd-duration: 250ms; –sd-easing: ease-in;

It looks like your message cut off. Do you want information about the HTML element “” and how to use it, or something else? If so, tell me whether you want:

1. a brief explanation of that attribute and example code,
2. accessibility/security concerns, or
3. how to animate with CSS/JS using that attribute.

Pick 1, 2, or 3 (or say “all”) and I’ll provide the answer.