How to vertically align all text in CSS?

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Here is my solution using JS. The idea is to transform the element into an image in order to get its data as pixel then loop through them to find the top and bottom of each character and apply a translation to fix the alignment. This will work with dynamic font properties.

The code is not optimized but it highlight the main idea:

var elems = document.querySelectorAll(".avatar");

var fixes = [];


for (var i = 0; i < elems.length; i++) {
  var current = elems[i];
  domtoimage.toPixelData(current)
    .then(function(im) {
      /* Search for the top limit */
      var t = 0;
      for (var y = 0; y < current.scrollHeight; ++y) {
        for (var x = 0; x < current.scrollWidth; ++x) {
          var j = (4 * y * current.scrollHeight) + (4 * x);
          if (im[j] == 255 && im[j + 1] == 255 && im[j + 2] == 255) {
            t = y;
            break;
          }
        }
      }
      /* Search the bottom limit*/
      var b = 0;
      for (var y = (current.scrollHeight - 1); y >= 0; --y) {
        for (var x = (current.scrollWidth - 1); x >= 0; --x) {
          var j = (4 * y * current.scrollHeight) + (4 * x);
          if (im[j] == 255 && im[j + 1] == 255 && im[j + 2] == 255) {
            b = current.scrollHeight - y;
            break;
          }
        }
      }
      /* get the difference and apply a translation*/
      var diff = (b - t)/2;
      fixes.push(diff);
      /* we apply the translation when all are calculated*/
      if(fixes.length == elems.length) {
        for (var k = 0; k < elems.length; k++) {
          elems[k].querySelector('.character').style.transform = "translateY(" + fixes[k] + "px)";
        }
      }
    });
}
.avatar {
  border-radius: 50%;
  display: inline-flex;
  vertical-align:top;
  justify-content: center;
  align-items: center;
  width: 125px;
  height: 125px;
  font-size: 60px;
  background: 
    linear-gradient(red,red) center/100% 1px no-repeat,
    rgb(81, 75, 93);
  font-family: "Segoe UI";
  margin-bottom: 10px;
}

.character {
  color: #fff;
}
<script type="text/javascript" src="https://css-challenges.com/wp-content/themes/ronneby_child/js/dom-to-image.js"></script>
<div class="avatar">
  <div class="character">W</div>
</div>

<div class="avatar">
  <div class="character">y</div>
</div>

<div class="avatar">
  <div class="character" style="font-size:35px">a</div>
</div>

<div class="avatar">
  <div class="character" style="font-size:25px">2</div>
</div>
<div class="avatar">
  <div class="character">o</div>
</div>
<div class="avatar">
  <div class="character">|</div>
</div>
<div class="avatar">
  <div class="character">@</div>
</div>
<div class="avatar">
  <div class="character">Â</div>
</div>

<div class="avatar">
  <div class="character" style="font-family:arial">Q</div>
</div>
<div class="avatar">
  <div class="character">~</div>
</div>
<div class="avatar">
  <div class="character">8</div>
</div>

<div class="avatar">
  <div class="character">ä</div>
</div>
<div class="avatar">
  <div class="character">ç</div>
</div>

<div class="avatar">
  <div class="character">$</div>
</div>

<div class="avatar">
  <div class="character">></div>
</div>
<div class="avatar">
  <div class="character">%</div>
</div>

UPDATE

Here is a first optimization of the code:

var elems = document.querySelectorAll(".avatar");
var k = 0;

for (var i = 0; i < elems.length; i++) {
  domtoimage.toPixelData(elems[i])
    .then(function(im) {
     var l = im.length;
      /* Search for the top limit */
      var t = 0;
      for (var j = 0; j < l; j+=4) {
          if (im[j+1] == 255) { /* Since we know the colors, we can only test the G composant */
            t = Math.ceil((j/4)/125);
            break;
          }
      }
      /* Search the bottom limit*/
      var b = 0;
      for (var j = l - 1; j >= 0; j-=4) {
          if (im[j+1] == 255) {
            b = 125 - Math.ceil((j/4)/125);
            break;
          }
      }
      /* get the difference and apply a translation*/
      elems[k].querySelector('.character').style.transform = "translateY(" + (b - t)/2 + "px)";
      k++;
    });
}
.avatar {
  border-radius: 50%;
  display: inline-flex;
  vertical-align:top;
  justify-content: center;
  align-items: center;
  width: 125px;
  height: 125px;
  font-size: 60px;
  background: 
    linear-gradient(red,red) center/100% 1px no-repeat,
    rgb(81, 75, 93);
  font-family: "Segoe UI";
  margin-bottom: 10px;
}

.character {
  color: #fff;
}
<script type="text/javascript" src="https://css-challenges.com/wp-content/themes/ronneby_child/js/dom-to-image.js"></script>
<div class="avatar">
  <div class="character">W</div>
</div>

<div class="avatar">
  <div class="character">y</div>
</div>

<div class="avatar">
  <div class="character" style="font-size:35px">a</div>
</div>

<div class="avatar">
  <div class="character" style="font-size:25px">2</div>
</div>
<div class="avatar">
  <div class="character">o</div>
</div>
<div class="avatar">
  <div class="character">|</div>
</div>
<div class="avatar">
  <div class="character">@</div>
</div>
<div class="avatar">
  <div class="character">Â</div>
</div>

<div class="avatar">
  <div class="character" style="font-family:arial">Q</div>
</div>
<div class="avatar">
  <div class="character">~</div>
</div>
<div class="avatar">
  <div class="character">8</div>
</div>

<div class="avatar">
  <div class="character">ä</div>
</div>
<div class="avatar">
  <div class="character">ç</div>
</div>

<div class="avatar">
  <div class="character">$</div>
</div>

<div class="avatar">
  <div class="character">></div>
</div>
<div class="avatar">
  <div class="character">%</div>
</div>

I am using dom-to-image plugin for this.

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