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Babel is required to process package imports. If you need a different preprocessor remove all packages first.

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Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

              
                <button class="font-style">
  Hover Me

  <!-- If you have time, it would be better to generate this SVG for each button you want the effect on -->
  <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 426 98">
    <defs>
      <mask id="mask">
        <circle class="mask" r="0" fill="#fff" cx="0" cy="50" />
      </mask>
    </defs> 

    <g id="toBeRevealed" mask="url(#mask)">
    <linearGradient id="gradient">
        <stop stop-color="#fc0f47" offset="0%" />
        <stop stop-color="#9b040c" offset="100%" />
      </linearGradient>
      <rect width="426" height="98" fill="url(#gradient)" />
      <text x="15" y="81" class="font-style" textAnchor="start" fill="#fff">Hover Me</text>
    </g>
  </svg>
</button>
              
            
!

CSS

              
                html,
body {
  height: 100%;
}

html {
  font-size: 62.5%;
}

body {
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background: #202020;
}

.font-style {
  font-family: 'Heebo', sans-serif;
  font-size: 9rem;
  font-weight: 700;
  line-height: 1;
  text-stroke: 0.1rem rgba(255,255,255, 0.5);
  -webkit-text-stroke: 0.1rem rgba(255,255,255, 0.5);
  white-space: nowrap;
  /* Unfortunately letter-spacing and text-length don't line up with HTML text across the different browsers... */
  /* ...so you're forced to just leave the letter spacing as is. */
}

button {
  margin: 0;
  padding: 8px 19px 0 16px;
  border: 0;
  background: none;
  cursor: pointer;
  color: transparent;
  position: relative;
  overflow: hidden;
}

svg {
  position: absolute;
  top: 0;
  left: 0;
  overflow: hidden;
  border-radius: 1px;
  width: 100%;
  height: 100%;
}
              
            
!

JS

              
                const button = document.querySelector('button');
const buttonWidth = button.clientWidth;
const buttonHeight = button.clientHeight;
const buttonStyles = button.getBoundingClientRect();

button.addEventListener('mouseenter', mouseEnter);
button.addEventListener('mouseleave', mouseLeave);

function mouseEnter(e) {
  // Figure out the co-ordinates of the cursor over the button
  // We will trigger the hover animation from that position
  const xPercent = ((e.clientX - buttonStyles.left) / buttonWidth) * 100;
  const yPercent = ((e.clientY - buttonStyles.top) / buttonHeight) * 100;
  
  // If the cursor is far from the center of the button the hover will be slower since we have more area to fill
  // To fix this we increase the animation speed the further you are from the center of the button
  let transitionMultiplier = xPercent < 50 ? ((xPercent - 50) * -1) / 50 : (xPercent - 50) / 50;
  const speed = 1.3;
  const speedBasedOnCursorPosition = speed - ((speed * 0.65 ) * transitionMultiplier);

  TweenMax.set('.mask', {
    opacity: 1,
    attr: {
      r: 0,
      cx: e.clientX - buttonStyles.left,
      cy: e.clientY - buttonStyles.top
    }
  });
  new TimelineMax().to('.mask', speedBasedOnCursorPosition, {
    ease: Power4.easeOut,
    attr: { r: buttonWidth * 0.4 }
  });
}

function mouseLeave() {
  const tl = new TimelineMax()
        .to('.mask', 0.2, {ease: Power1.easeOut, opacity: 0});
}
              
            
!
999px

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