$(function(){
  $('span').width($('span').width()/2);
  $('span:nth-child(2)').css('text-indent', -$('span').width());
});

body{
  font-family: arial;
}
span{
  display: inline-block;
  overflow: hidden;
}
span:nth-child(2){
  color: red;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<span>X</span><span>X</span>

$(function(){
  var $hc = $('.half-color');
  var str = $hc.text();
  $hc.html("");

  var i = 0;
  var chars;
  var dupText;

  while(i < str.length){
    chars = str[i];
    if(chars == " ") chars = "&nbsp;";
    dupText = "<span>" + chars + "</span>";

    var firstHalf = $(dupText);
    var secondHalf = $(dupText);

    $hc.append(firstHalf)
    $hc.append(secondHalf)

    var width = firstHalf.width()/2;

    firstHalf.width(width);
    secondHalf.css('text-indent', -width);

    i++;
  }
});

.half-color span{
  font-size: 2em;
  display: inline-block;
  overflow: hidden;
}
.half-color span:nth-child(even){
  color: red;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="half-color">This is a sentence</div>

// jQuery for automated mode
jQuery(function($) {
    var text, chars, $el, i, output;

    // Iterate over all class occurences
    $('.textToHalfStyle').each(function(idx, el) {
    $el = $(el);
    text = $el.text();
    chars = text.split('');

    // Set the screen-reader text
    $el.html('<span style="position: absolute !important;clip: rect(1px 1px 1px 1px);clip: rect(1px, 1px, 1px, 1px);">' + text + '</span>');

    // Reset output for appending
    output = '';

    // Iterate over all chars in the text
    for (i = 0; i < chars.length; i++) {
        // Create a styled element for each character and append to container
        output += '<span aria-hidden="true" class="halfStyle" data-content="' + chars[i] + '">' + chars[i] + '</span>';
    }

    // Write to DOM only once
    $el.append(output);
  });
});

.halfStyle {
    position: relative;
    display: inline-block;
    font-size: 80px; /* or any font size will work */
    color: black; /* or transparent, any color */
    overflow: hidden;
    white-space: pre; /* to preserve the spaces from collapsing */
}

.halfStyle:before {
    display: block;
    z-index: 1;
    position: absolute;
    top: 0;
    left: 0;
    width: 50%;
    content: attr(data-content); /* dynamic content for the pseudo element */
    overflow: hidden;
    color: #f00;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>

<p>Single Characters:</p>
<span class="halfStyle" data-content="X">X</span>
<span class="halfStyle" data-content="Y">Y</span>
<span class="halfStyle" data-content="Z">Z</span>
<span class="halfStyle" data-content="A">A</span>

<hr/>
<p>Automated:</p>

<span class="textToHalfStyle">Half-style, please.</span>

jQuery(function($) {
    var halfstyle_text, halfstyle_chars, $halfstyle_el, halfstyle_i, halfstyle_output, halfstyle_style;

    // Iterate over all class occurrences
    $('.textToHalfStyle').each(function(idx, halfstyle_el) {
        $halfstyle_el = $(halfstyle_el);
        halfstyle_style = $halfstyle_el.data('halfstyle') || 'hs-base';
        halfstyle_text = $halfstyle_el.text();
        halfstyle_chars = halfstyle_text.split('');

        // Set the screen-reader text
        $halfstyle_el.html('<span style="position: absolute !important;clip: rect(1px 1px 1px 1px);clip: rect(1px, 1px, 1px, 1px);">' + halfstyle_text + '</span>');

        // Reset output for appending
        halfstyle_output = '';

        // Iterate over all chars in the text
        for (halfstyle_i = 0; halfstyle_i < halfstyle_chars.length; halfstyle_i++) {
            // Create a styled element for each character and append to container
            halfstyle_output += '<span aria-hidden="true" class="halfStyle ' + halfstyle_style + '" data-content="' + halfstyle_chars[halfstyle_i] + '">' + halfstyle_chars[halfstyle_i] + '</span>';
        }

        // Write to DOM only once
        $halfstyle_el.append(halfstyle_output);
    });
});

/* start half-style hs-base */

.halfStyle.hs-base {
    position: relative;
    display: inline-block;
    font-size: 80px; /* or any font size will work */
    overflow: hidden;
    white-space: pre; /* to preserve the spaces from collapsing */
    color: #000; /* for demo purposes */
}

.halfStyle.hs-base:before {
    display: block;
    z-index: 1;
    position: absolute;
    top: 0;
    width: 50%;
    content: attr(data-content); /* dynamic content for the pseudo element */
    pointer-events: none; /* so the base char is selectable by mouse */
    overflow: hidden;
    color: #f00; /* for demo purposes */
}

/* end half-style hs-base */


/* start half-style hs-horizontal-third */

.halfStyle.hs-horizontal-third { /* base char and also the bottom 1/3 */
    position: relative;
    display: inline-block;
    font-size: 80px; /* or any font size will work */
    color: transparent;
    overflow: hidden;
    white-space: pre; /* to preserve the spaces from collapsing */
    color: #f0f;
    text-shadow: 2px 2px 0px #0af; /* for demo purposes */
}

.halfStyle.hs-horizontal-third:before { /* creates the top 1/3 */
    display: block;
    z-index: 2;
    position: absolute;
    top: 0;
    height: 33.33%;
    content: attr(data-content); /* dynamic content for the pseudo element */
    overflow: hidden;
    pointer-events: none; /* so the base char is selectable by mouse */
    color: #f00; /* for demo purposes */
    text-shadow: 2px -2px 0px #fa0; /* for demo purposes */
}

.halfStyle.hs-horizontal-third:after { /* creates the middle 1/3 */
    display: block;
    position: absolute;
    z-index: 1;
    top: 0;
    height: 66.66%;
    content: attr(data-content); /* dynamic content for the pseudo element */
    overflow: hidden;
    pointer-events: none; /* so the base char is selectable by mouse */
    color: #000; /* for demo purposes */
    text-shadow: 2px 2px 0px #af0; /* for demo purposes */
}

/* end half-style hs-horizontal-third */


/* start half-style hs-PeelingStyle, by user SamTremaine on Stackoverflow.com */

.halfStyle.hs-PeelingStyle {
  position: relative;
  display: inline-block;
  font-size: 68px;
  color: rgba(0, 0, 0, 0.8);
  overflow: hidden;
  white-space: pre;
  transform: rotate(4deg);
  text-shadow: 2px 1px 3px rgba(0, 0, 0, 0.3);
}

.halfStyle.hs-PeelingStyle:before { /* creates the left part */
  display: block;
  z-index: 1;
  position: absolute;
  top: -0.5px;
  left: -3px;
  width: 100%;
  content: attr(data-content);
  overflow: hidden;
  pointer-events: none;
  color: #FFF;
  transform: rotate(-4deg);
  text-shadow: 0px 0px 1px #000;
}

/* end half-style hs-PeelingStyle */


/* start half-style hs-KevinGranger, by user KevinGranger on StackOverflow.com*/

.textToHalfStyle.hs-KevinGranger {
  display: block;
  margin: 200px 0 0 0;
  text-align: center;
}

.halfStyle.hs-KevinGranger {
  font-family: 'Libre Baskerville', serif;
  position: relative;
  display: inline-block;
  width: 1;
  font-size: 70px;
  color: black;
  overflow: hidden;
  white-space: pre;
  text-shadow: 1px 2px 0 white;
}

.halfStyle.hs-KevinGranger:before {
  display: block;
  z-index: 1;
  position: absolute;
  top: 0;
  width: 50%;
  content: attr(data-content); /* dynamic content for the pseudo element */
  overflow: hidden;
  color: white;
}

/* end half-style hs-KevinGranger

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<p>
    <span class="textToHalfStyle" data-halfstyle="hs-base">Half-style, please.</span>
</p>
<p>
    <span class="textToHalfStyle" data-halfstyle="hs-horizontal-third">Half-style, please.</span>
</p>
<p>
    <span class="textToHalfStyle" data-halfstyle="hs-PeelingStyle">Half-style, please.</span>
</p>
<p style="background-color:#000;">
    <span class="textToHalfStyle" data-halfstyle="hs-KevinGranger">Half-style, please.</span>
</p>

h1 {
  display: inline-block;
  margin: 0; /* for demo snippet */
  line-height: 1em; /* for demo snippet */
  font-family: helvetica, arial, sans-serif;
  font-weight: bold;
  font-size: 300px;
  background: linear-gradient(to right, #7db9e8 50%,#1e5799 50%);
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

<h1>X</h1>

$("div").each(function() {
  var CHARS = $(this).text().split('');
  $(this).html("");
  $.each(CHARS, function(index, char) {
    var canvas = $("<canvas />")
      .css("width", "40px")
      .css("height", "40px")
      .get(0);
    $("div").append(canvas);
    var ctx = canvas.getContext("2d");
    var gradient = ctx.createLinearGradient(0, 0, 130, 0);
    gradient.addColorStop("0", "blue");
    gradient.addColorStop("0.5", "blue");
    gradient.addColorStop("0.51", "red");
    gradient.addColorStop("1.0", "red");
    ctx.font = '130pt Calibri';
    ctx.fillStyle = gradient;
    ctx.fillText(char, 10, 130);
  });
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div>Example Text</div>

span {
  position: relative;
  color: rgba(50,50,200,0.5);
}

span:before {
  content: attr(data-char);
  position: absolute;
  width: 50%;
  overflow: hidden;
  color: rgb(50,50,200);
}

<span data-char="X">X</span>

var textToHalfStyle = $('.textToHalfStyle').text();
var textToHalfStyleChars = textToHalfStyle.split('');
$('.textToHalfStyle').html('');
$.each(textToHalfStyleChars, function(i,v){
    $('.textToHalfStyle').append('<span class="halfStyle" data-content="' + v + '">' + v + '</span>');
});

body{
    background-color: black;
}
.textToHalfStyle{
    display:block;
    margin: 200px 0 0 0;
    text-align:center;
}
.halfStyle {
    font-family: 'Libre Baskerville', serif;
    position:relative;
    display:inline-block;
    width:1;
    font-size:70px;
    color: black;
    overflow:hidden;
    white-space: pre;
    text-shadow: 1px 2px 0 white;
}
.halfStyle:before {
    display:block;
    z-index:1;
    position:absolute;
    top:0;
    width: 50%;
    content: attr(data-content); /* dynamic content for the pseudo element */
    overflow:hidden;
    color: white;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<span class="textToHalfStyle">Dr. Jekyll and M. Hide</span>

var title = document.querySelector('h1'),
    text = title.innerHTML,
    svgTemplate = document.querySelector('svg'),
    charStyle = svgTemplate.querySelector('#text');

svgTemplate.style.display = 'block';

var space = 0;

for (var i = 0; i < text.length; i++) {
  var x = charStyle.cloneNode();
  x.textContent = text[i];
  svgTemplate.appendChild(x);
  x.setAttribute('x', space);
  space += x.clientWidth || 15;
}

title.innerHTML = '';
title.appendChild(svgTemplate);

<svg style="display: none; height: 100px; width: 100%" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1">
    <defs id="FooDefs">
        <linearGradient id="MyGradient" x1="0%" y1="0%" x2="100%" y2="0%">
            <stop offset="50%" stop-color="blue" />
            <stop offset="50%" stop-color="red" />
        </linearGradient>
    </defs>
    <text y="50%" id="text" style="font-size: 72px; fill: url(#MyGradient)"></text>
</svg>

<h1>This is not a solution X</h1>

.halfed, .halfed1 {
  float: left;
}

.halfed, .halfed1 {
  font-family: arial;
  font-size: 300px;
  font-weight: bolder;
  width: 200px;
  height: 300px;
  position: relative; /* To help hold the content value within */
  overflow: hidden;
  color: #000;
}




.halfed:before, .halfed1:before   {
  width: 50%; /* How much we'd like to show */
  overflow: hidden; /* Hide what goes beyond our dimension */  
  content: 'X'; /* Halfed character */
  height: 100%;
  position: absolute;
  color: #28507D;

}



/* For Horizontal cut off */ 

.halfed1:before   {
  width: 100%;
  height: 55%;
  
}

<div class="halfed"> X </div>

<div class="halfed1"> X </div>

body {
  text-align: center;
  margin: 0;
}

h1 {
  color: #111;
  font-family: arial;
  position: relative;
  font-family: 'Oswald', sans-serif;
  display: inline-block;
  font-size: 2.5em;
}

h1::after {
  content: attr(data-title-text);
  color: #e5554e;
  position: absolute;
  left: 0;
  top: 0;
  clip: rect(0, 1000px, 30px, 0);
}

<h1 data-title-text="Display Text">Display Text</h1>

p.char {
  position: relative;
  display: inline-block;
  font-size: 60px;
  color: red;
}

p.char:before {
  position: absolute;
  content: attr(char);
  width: 50%;
  overflow: hidden;
  color: black;
}

<p class="char" char="S">S</p>
<p class="char" char="t">t</p>
<p class="char" char="a">a</p>
<p class="char" char="c">c</p>
<p class="char" char="k">k</p>
<p class="char" char="o">o</p>
<p class="char" char="v">v</p>
<p class="char" char="e">e</p>
<p class="char" char="r">r</p>
<p class="char" char="f">f</p>
<p class="char" char="l">l</p>
<p class="char" char="o">o</p>
<p class="char" char="w">w</p>

div {
    position: relative;
    top: 2em;
    height: 2em;
    text-transform: full-width;
}

div:before,
div:after {
    content: attr(data-content);
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
}

div:after {
    color: red;
    /* mask for a single character. By repeating this mask, all the string becomes masked */
    -webkit-mask-image: linear-gradient(to right, transparent 0, transparent .5em, white .5em, white 1em);
    -webkit-mask-repeat: repeat-x;  /* repeat the mask towards the right */
    -webkit-mask-size: 1em;         /* relative width of a single character */ 
    
    /* non-vendor mask settings */
    mask-image: linear-gradient(to right, transparent 0, transparent .5em, white .5em, white 1em);
    mask-repeat: repeat-x;
    mask-size: 1em;
}


/* demo purposes */
input[name="fontSize"]:first-of-type:checked ~ div {
    font-size: 1em;
}

input[name="fontSize"]:first-of-type + input:checked ~ div {
    font-size: 2em;
}

input[name="fontSize"]:first-of-type + input + input:checked ~ div {
    font-size: 3em;
}

Font-size:
  <input type="radio" name="fontSize" value="1em">
  <input type="radio" name="fontSize" value="2em" checked>
  <input type="radio" name="fontSize" value="3em">

  <div data-content="A CSS only solution..."></div>
  <div data-content="Try it on Firefox!"></div>

const
    dataElement = document.getElementById("data"),
    content = dataElement.textContent,
    zoom = function (fontSize) {
        dataElement.style['font-size'] = fontSize + 'em';           
    };

while (dataElement.firstChild) {
    dataElement.firstChild.remove()
}
for(var i = 0; i < content.length; ++i) {
    const
        spanElem = document.createElement('span'),
        ch = content[i];    
    spanElem.setAttribute('data-ch', ch);
    spanElem.appendChild(document.createTextNode(ch === ' ' ? '\u00A0' : ch));
    data.appendChild(spanElem);
}

#data {
    position: relative;
    top: 2em;
    height: 2em;
    font-size: 2em;
}

#data span {
    display: inline-block;
    position: relative;
    color: transparent;
}

#data span:before,
#data span:after {
    content: attr(data-ch);
    display: inline-block;
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    text-align: center;
    color: initial;
}

#data span:after {
    color: red;
    -webkit-mask-image: linear-gradient(to right, transparent 0, transparent 50%, white 50%, white 100%);
    mask-image: linear-gradient(to right, transparent 0, transparent 50%, white 50%, white 100%);
}

Font-size:
<input type="range" min=1 max=4 step=0.05 value=2 oninput="zoom(this.value)" onchange="zoom(this.value)">

<div id="data">A Fallback Solution...For all browsers</div>

div {
  font-size: 80px;
  font-weight: bolder;
  color: transparent;
  padding: 0;
  margin: 0;
  background: linear-gradient(90deg, rgb(34, 67, 143) 0% 50%, #409FBF 50%);
  background-clip: text;
  -webkit-background-clip: text;
}

.one {
  font-family: 'Nova Mono';
  background-repeat: repeat-x;
  background-size: 45px;
}

.two {
  font-family: 'Gideon Roman';
  writing-mode: vertical-lr;
  text-orientation: upright;
  letter-spacing: -35px;
  height: 500px;
}

<!-- get the fonts -->
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=Nova+Mono&display=swap" rel="stylesheet">
<link href="https://fonts.googleapis.com/css2?family=Gideon+Roman&display=swap" rel="stylesheet">


<div id='one' class="one">X-RAY Winter</div>
<div class="two">Minty</div>