[data-shows-busy-blocked] { cursor: wait !important; opacity: .65; }
[data-shows-busy-source] { cursor: wait !important; }
[data-shows-busy-source]::after {
    content: ''; display: inline-block; width: 1em; height: 1em; margin-inline-start: .5em;
    vertical-align: -.15em; border: 2px solid currentColor; border-inline-end-color: transparent;
    border-radius: 50%; animation: shows-button-busy .8s linear infinite;
}
form[data-shows-busy-source]::after { display: none; }
@keyframes shows-button-busy { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { [data-shows-busy-source]::after { animation: none; } }