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CSS

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JavaScript

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HTML 

              
                <main>
  
  <h1>Disabled button</h1>
  
  <p class="intro">
    HTML provide the standard 'disabled' attribute for interactive elements.
    But always using this attribute to indicate that an action is disabled
    can sometime hurt accessibility. This example tries to explain why.
  </p>
  
  <h2>
    Why you should use 'disabled'?
  </h2>
  <ul>
    <li>You get native action blocking when user tries to click.</li>
    <li>You get native style for button</li>
  </ul>

  <h2>
    Why should you not use 'disabled'?
  </h2>
  <ul>
    <li>Action do not participate anymore in <kbd>Tab</kbd> navigation.</li>
    <li>Action cannot get focus, which is blocking if you expose
        a tooltip on focus.
    </li>
  </ul>
  
  <p>
    It all depend on expected UX, but I think it's much better to
    <em>not</em> use HTML 'disabled' attribute and only specify disabled
    through 'aria-disabled'.
  </p>

  <h2>Demo</h2>

  <p>Using disabled:</p>
  <form>
    <button type="button" class="btn">Select 1</button>
    <button type="button" class="btn" disabled='disabled'
            data-bs-toggle="tooltip" data-bs-title="This option is not available">
      Select 2
    </button>
    <button type="button" class="btn">Select 3</button>
  </form>
  
  <p class="note">
    Note tooltip is not visible on disabled button.
    Official guideline from Bootstrap would be to wrap the button in a span, 
    but that imply that span must be able to gain focus.
  </p>

  <p>Using aria-disabled:</p>
  <form>
    <button type="button" class="btn">Select 1</button>
    <button type="button" class="btn">Select 2</button>
    <button type="button" class="btn" aria-disabled='true'
            data-bs-toggle="tooltip" data-bs-title="This option is not available">
      Select 3
    </button>
  </form>
  
  <p class="note">
    Note that you can navigate to disabled button with <kbd>Tab</kbd> key.
  </p>

</main>
!

CSS 

              
                /* --- GLOBAL STYLE */

:root {
  --clr-grey-dark:       hsl(0, 0%, 10%);
  --clr-grey-dark-50:    hsla(0, 0%, 10%,  .5);
  --clr-grey-medium:     hsl(0, 0%, 50%);
  --clr-grey-medium-50:  hsla(0, 0%, 50%, .5);
  --clr-grey-light:      hsl(0, 0%, 95%);
  --clr-snow:            hsl(0, 90%, 98%);
  --clr-snow-50:         hsla(0, 90%, 98%, .5);
  --clr-blue-light:      hsl(210, 80%, 80%);
  --clr-intro-bg:        hsl(210, 60%, 80%);
  --clr-details:         hsl(170, 40%, 95%);
}

body {
  font-size: 18px;
  font-family: sans-serif;
  background-color: var(--clr-grey-dark);
  
  display: grid;
  min-height: 100vh;
}

main {
  margin: 0 auto;
  padding: .5rem;
  min-width: 40rem;
  max-width: 40rem;
  background-color: var(--clr-grey-light);
  min-height: 100%;
}

h1 {
  margin: 1rem 0 1rem;
}
h2 {
  margin: 3rem 0 2rem;
}

ul li {
  margin: .5rem 0 .5rem 0;
  line-height: 1.5rem;
}

*:focus,
.btn:focus {
  outline: unset;
}

kbd {
  color: var(--clr-grey-dark);
  background-color: var(--clr-grey-medium-50);
  padding: .1rem .5rem;
  border-radius: .2rem;
  border-top: 1px solid white;
  border-left: 1px solid white;
  border-right: 1px solid var(--clr-grey-dark);
  border-bottom: 1px solid var(--clr-grey-dark);
}

*:focus-visible,
.btn:focus-visible,
.focused--outline {
  outline: 2px solid red !important;
  outline-offset: 2px;
}

.img-placeholder {
  display: inline-block;
  width: 2rem;
  height: 2rem;
  border: 1px solid var(--clr-grey-dark);

  background-color: var(--clr-grey-dark);
  background-image:
    linear-gradient(45deg, transparent 50%, var(--clr-grey-light) 50%);
  background-size: 2rem 2rem;
}

.capsule {
  display: inline-block;
  margin: .5rem auto -.5rem auto;
  padding: .25rem .5rem;

  border-radius: .3rem;
  background-color: var(--clr-blue-light);
}
.capsule.capsule--top {
  border-radius: .3rem .3rem 0 0;
}


.intro {
  margin: 2rem 1rem;
  padding: .5rem;
  
  font-size: .95rem;
  background-color: var(--clr-intro-bg);
  
  border-radius: .5rem;
}

.note {
  font-size: .9rem;
  padding: .5rem 0 .5rem 1rem;
  border-left: 4px solid var(--clr-grey-medium-50);
}

.btn {
  background: white;
  font-weight: bold;
  border: 2px solid var(--clr-grey-dark);
  border-radius: .5rem;
  padding: .5rem 1rem;
  margin: 1rem;
}

.btn:focus,
.btn:hover {
  box-shadow: 0px .25rem .2rem .1rem black;
}

.btn--disabled,
button[disabled],
button[aria-disabled=true] {
  background: var(--clr-grey-light);
  border-color: var(--clr-grey-dark-50);
  color: var(--clr-grey-dark-50);
  font-weight: normal;
  
  display: inline-flex;
  align-items: center;
}
!

JS 

              
                const tooltipTriggerList = document.querySelectorAll('[data-bs-toggle="tooltip"]')
const tooltipList = [...tooltipTriggerList].map(tooltipTriggerEl => new bootstrap.Tooltip(tooltipTriggerEl))
!
999px

Console