html – How to animate underline from left to right?-ThrowExceptions

Exception or error:

I am trying to replicate this transition from uber.design site:

I am trying to replicate this transition from uber.design site

The thing is that i am stuck at reversing the transition:

.un {
  display: inline-block;
}

.un:after {
  content: '';
  width: 0px;
  height: 2px;
  display: block;
  background: black;
  transition: 300ms;
}

.un:hover:after {
  width: 100%;
<span class="un">Underlined Text</span>
How to solve:

You can use gradient and adjust background-position with a delay to obtain such effect:

.un {
  display: inline-block;
  padding-bottom:2px;
  background-image: linear-gradient(#000, #000);
  background-position: 0 100%; /*OR bottom left*/
  background-size: 0% 2px;
  background-repeat: no-repeat;
  transition:
    background-size 0.3s,
    background-position 0s 0.3s; /*change after the size immediately*/
}

.un:hover {
  background-position: 100% 100%; /*OR bottom right*/
  background-size: 100% 2px;
}
<span class="un">Underlined Text</span>

In case you want a continuous animation on hover you can try this:

.un {
  display: inline-block;
  padding-bottom:2px;
  background-image: linear-gradient(#000, #000);
  background-position: right -100% bottom 0;
  background-size: 200% 2px;
  background-repeat: no-repeat;
}

.un:hover {
  background-position: left -100% bottom 0;
  transition: background-position 0.5s;
}
<span class="un">Underlined Text</span>

You can check this answer for more details about how the calculation of the different value is done: Using percentage values with background-position on a linear gradient


Another kind of animation

.un {
  display: inline-block;
  padding-bottom:2px;
  background-image: linear-gradient(to right, #000 33%,transparent 33% 66%,#000 66%);
  background-position: right bottom;
  background-size: 300% 2px;
  background-repeat: no-repeat;
}

.un:hover {
  background-position: left bottom;
  transition: background-position 0.5s;
}
<span class="un">Underlined Text</span>

###

You’ll need your pseudo element to be absolute positioned and use the :not selector to reproduce this effect.

.un {
  display: inline-block;
  position: relative;
}

.un:after {
  content: '';
  width: 0px;
  height: 2px;
  position: absolute;
  top: 100%;
  left: 0;
  background: black;
  transition: 300ms;
}

.un:hover:after {
  width: 100%;
}

.un:not(:hover):after {
  right: 0;
  left: auto;
}
<span class="un">Underlined Text</span>

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