Css Zero Showcase
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<form action="/slow_action" accept-charset="UTF-8" method="post"><input type="hidden" name="authenticity_token" value="pgYUXY23HsE-LlMFjcSvKaZJheJLxA-CaoY_IIM1AlzJET1UIE3oXOzM62IfDh23ArtxtnAMp1DQRLK6rleCTQ" autocomplete="off" />
  <button name="button" type="submit" class="btn btn--loading"><span>Click and wait</span></button>
</form>
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<%= form_with(url: main_app.slow_action_path) do |form| %>
  <%= button_tag tag.span("Click and wait"), class: "btn btn--loading" %>
<% end %>
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.btn {
  --btn-background: var(--color-bg);
  --hover-color: oklch(from var(--btn-background) calc(l * .95) c h);
  align-items: center;
  background-color: var(--btn-background);
  block-size: var(--btn-block-size, auto);
  border-radius: var(--btn-radius, var(--rounded-md));
  border: 1px solid var(--btn-border-color, var(--color-border));
  box-shadow: var(--btn-box-shadow, var(--shadow-xs));
  color: var(--btn-color, var(--color-text));
  column-gap: var(--size-2);
  cursor: default;
  display: inline-flex;
  font-size: var(--btn-font-size, var(--text-sm));
  font-weight: var(--btn-font-weight, var(--font-medium));
  inline-size: var(--btn-inline-size, auto);
  justify-content: var(--btn-justify-content, center);
  padding: var(--btn-padding, .375rem 1rem);
  position: relative;
  text-align: var(--btn-text-align, center);
  white-space: nowrap;
  img:not([class]) {
    filter: var(--btn-icon-color, var(--color-filter-text));
  }
  &:hover {
    background-color: var(--btn-hover-color, var(--hover-color));
  }
  &:focus-visible {
    outline: var(--btn-outline-size, 2px) solid var(--color-selected-dark);
  }
  &:is(:disabled, [aria-disabled]) {
    opacity: var(--opacity-50);
    pointer-events: none;
  }
}
.btn--primary {
  --btn-background: var(--color-primary);
  --btn-border-color: transparent;
  --btn-color: var(--color-text-reversed);
  --btn-icon-color: var(--color-filter-text-reversed);
}
.btn--secondary {
  --btn-background: var(--color-secondary);
  --btn-border-color: transparent;
}
.btn--borderless {
  --btn-border-color: transparent;
  --btn-box-shadow: none;
}
.btn--positive {
  --btn-background: var(--color-positive);
  --btn-border-color: transparent;
  --btn-color: white;
  --btn-icon-color: invert(1);
}
.btn--negative {
  --btn-background: var(--color-negative);
  --btn-border-color: transparent;
  --btn-color: white;
  --btn-icon-color: invert(1);
}
.btn--plain {
  --btn-background: transparent;
  --btn-border-color: transparent;
  --btn-hover-color: transparent;
  --btn-padding: 0;
  --btn-box-shadow: none;
}
.btn--icon {
  --btn-padding: var(--size-2);
}
[aria-busy] .btn--loading:disabled {
  > * {
    visibility: hidden;
  }
  &::after {
    animation: spin 1s linear infinite;
    background-image: url("loader-circle.svg");
    background-size: cover;
    block-size: var(--size-5);
    content: "";
    filter: var(--btn-icon-color, var(--color-filter-text));
    inline-size: var(--size-5);
    position: absolute;
  }
}
Java Script is not required or multiple files are needed, check the notes.

Turbo adds aria-busy to the form while the form request is in progress, check here.