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                <div class="container">
  <input type="text" placeholder="Lorem ipsum dolor"><button class="copied" data-tooltip="Copy" data-clicked="Copied!"><i class="fas fa-copy"></i></button>

<i class="disclaimer">Disclaimer: doesn't actually copy anything.</i>


Create a psuedo-element to display the tooltip with
some basic styling to make it visible when displayed,
but hide it by default.
.copied::after {
  /* Make sure the psuedo-element exists in the DOM */
  content: "";
  /* Hide the tooltip by default */
  opacity: 0;
  /* Some bacis styling to make it visible */
  background-color: #666;
  color: #FFF;

When the button is hovered, display the normal tooltip.
.copied:hover::after {
  /* Set the value of the tooltip */
  content: attr(data-tooltip);
  /* Make the tooltip visible ... */
  opacity: 1;
  /* ... with a small animation */
  transition: .2s ease opacity;

When the button has been clicked (it obtains :focus) apply
two animations to:
  1) keep the tooltip visible temporarily (even without hover)
  2) restore the original tooltip text after 1.
.copied:focus::after {
    /* Animation: tooltip-opacity 
     * Ensures the tooltip remains visible for the duration
     * of the animation.
    /* Animation: tooltip-content
     * Initially change the tooltip text to "data-clicked"
     * and change it back to "data-tooltip" when the tooltip
     * disappears again.
    /* Animation: tooltip-opacity 
     * After the animation ends, resume to whatever opacity
     * the tooltip should have based on other selectors.
    /* Animation: tooltip-content
     * After the animation ends make sure the "data-clicked"
     * text is displayed. This is required so that "data-
     * clicked" text can stay active for the duration of the
     * animation *AND* the text is set back to "data-tooltip"
     * when hovering the button again later.

  /* Make sure both animations take the same amount of time */
  --animation-duration: 2.5s;

When the button is being clicked (it obtains :active) 
reset any previous animations. This allows the animations
in .copied:focus::after to take effect again.
.copied:active::after {
  animation-name: none;

@-webkit-keyframes tooltip-opacity {
  /* Make sure the tooltip is visible */
  0%   { opacity: 1; }
  /* Keep it visible almost to the end */
  95%  { opacity: 1; }
  /* Slowly fade away when the animation ends */
  100% { opacity: 0; }
@-webkit-keyframes tooltip-content {
  /* Show the "data-clicked" text when the animation starts ... */
  0%   { content: attr(data-clicked); }
  /* ... keep that text for as long as possible */
  99%  { content: attr(data-clicked); }
  /* Resume to the default tooltip text when the animation ends. */
  100% { content: attr(data-tooltip); }

/** STYLING **/

input {
  border: 1px solid gray;
  border-radius: 6px 0 0 6px;
  box-sizing: border-box;
  display: inline-block;
  height: 36px;
  margin: 0;

button {
  background-color: #DDD;
  border-left: none;
  border-radius: 0 6px 6px 0;
  padding: 6px 12px;
button:hover {
  background-color: #888;
  color: #FFF;

input {
  border-right: none;
  padding: 6px 8px;
input:focus {
  box-shadow: 0 0 0 .2rem rgba(0, 123, 255, .25); /* courtesy of Boostrap */

.copied {
  overflow: visible;
  position: relative;
.copied::after {
  border-radius: 4px;
  left: 50%;
  padding: 6px 12px;
  position: absolute;
  top: calc(100% + 6px);
  transform: translateX(-50%);

/** LAYOUT **/

html, body {
  align-items: center;
  display: flex;
  height: 100%;
  justify-content: center;
.container {
  height: 78px;
  position: relative;
.disclaimer {
  bottom: 0;
  font-family: sans-serif;
  font-size: 10px;
  font-style: italics;
  position: absolute;
  right: 0;