Spinner
A spinner shows that something is working. It is one element with a CSS animation, no image and no script.
<div class="spinner" role="status" aria-label="Loading"></div>
A spinner
Add class="spinner" to an empty element. Give it a role and label so it is announced.
<div class="spinner" role="status" aria-label="Loading"></div>
Sizes
Add large for a bigger spinner.
<div class="spinner large" role="status" aria-label="Loading"></div>