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HTML 

              
                <!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>Demo of RevealFx</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" type="text/css" media="screen" href="main.css" />

</head>

<body>
  
    <div class="flexy flexy--center">
        <div class="flexy__items flexy__items--cyan">
            <h2 class="content__title content__title--center">
                <div id="rfx1" class="content__title__inner">It's wierd not to be weird</div><br />
                <div id="rfx2" class="content__title__inner content__title__inner--offset-1">- John Lennon
                </div>
            </h2>
            <div class="triggers">
                <button id="rev-trigger-1" class="btn btn--trigger">left to right</button>
                <button id="rev-trigger-2" class="btn btn--trigger">right to left</button>
                <button id="rev-trigger-3" class="btn btn--trigger">top to bottom</button>
                <button id="rev-trigger-4" class="btn btn--trigger">bottom to top</button>
                <button id="rev-trigger-5" class="btn btn--trigger">change the color</button>
            </div>
        </div>
        <div class="flexy__items flexy__items--magenta">
                <div class="dual">
                        <div class="dual__inner" id="rfx3">
                            <div class="dual__half"></div>
                        </div>
                        <div class="dual__content">
                            If you doubt your beliefs, you believe your doubts 
                        <br>If you fail to practice, you practice failure <span class="author">― Anonymous</span>
                        </div> 
                    </div>
                <div class="triggers">
                    <button id="rev-trigger-6" class="btn btn--trigger">Rerun</button>
                    
                </div>
            </div>
      <p> (The following demo Works best in chrome)</p>
        <div class="flexy__items flexy__items--yellow">
            <h2 class="content__title content__title--center">
                <div id="rfx4" class="content__title__inner">Be yourself,because everyone else is taken </div><br />
                <br>
            </h2>
            <div class="triggers">
                <button id="rev-trigger-7" class="btn btn--trigger">randomize the cover area</button>
                <button id="rev-trigger-8" class="btn btn--trigger">randomize the duration</button>
                <button id="rev-trigger-9" class="btn btn--trigger">delay the stagger</button>
                <button id="rev-trigger-10" class="btn btn--trigger">change the text</button>
                <button id="rev-trigger-11" class="btn btn--trigger">change the easing functions</button>
                <button id="rev-trigger-12" class="btn btn--trigger">Reset</button>
            </div>
        </div>
    </div>

<a href = "https://github.com/akhil0001/RevealFx" target="_blank">Find the code at github link </a>

</body>

</html>
!

CSS 

              
                /* taken from mary lou's block reveal effect demo */
@import url('https://fonts.googleapis.com/css?family=Ubuntu');
body{
    background:#f0f0f0;
    font-family: 'Ubuntu', sans-serif;
}
#rfx4
{
  background: -webkit-linear-gradient(left,#FFB900,#FF8C00,#F7630C,#E74856,#E81123,#0078D7,#0063B1);
   -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
 color: #303F9F;
}
.content {
	position: relative;
	min-height: 300px;
	overflow-x: hidden;
}

.content--full {
	height: 100vh;
	min-height: 600px;
}

.flexy {
	display: flex;
	flex-wrap: wrap;
	flex-direction: column;
	align-items: center;
}

.flexy--center {
    justify-content: center;
}

.flexy--row {
	flex-direction: row;
}
.flexy__items
{
    padding:1em;
}
.content__heading {
	flex: none;
	width: 100%;
	/* padding: 0 1vw; */
}

.content__heading--center {
	text-align: center;
}

.content__title {
	font-size: 8vw;

}

.content__title--half {
	width: 50vw;
	z-index: 2;
}

.content__title--enclosed {
	padding: 0;
	margin: 0;
}

.content__title--center {
    margin: auto;
    text-align: center;
}

.content__title--right {
	text-align: right;
	padding: 0 0 0 2em;
}

.content__title--left {
	margin-left: -18vw;
}

.content__title--medium  {
	font-size: 5vw;
}

.content__title--small  {
	font-size: 2vw;
}

.content__title__inner {
	flex: none;
	display: inline-block;
	white-space: wrap;
	position: relative;
}

.content__title__inner--offset-1 {
    font-size: 4vw;
	top: -0.25em;
	left: 18.6vw;
}

.content__title__inner--offset-2 {
	top: -0.25em;
	left: 1.75vw;
}

.content__title__inner--offset-3 {
	left: -10vw;
	top: -0.25em;
}
.btn {
	border: 0;
	padding: 0;
	margin: 0;
	background: none;
    color: inherit;
    cursor: pointer;
}

.btn:focus {
	outline: none;
}

.btn--trigger {
	margin: 0.25em;
	display: block;
    white-space: nowrap;
    border: 2px solid;
    padding: 0.5em;
}

.triggers
{
    display: flex;
    flex-flow: row wrap;
}
.dual {
	width: 90vw;
	margin: 2em auto;
	position: relative;
}

.dual__inner {
	position: absolute;
	width: 100%;
	height: 100%;	
}

.dual__half {
	position: absolute;
	height: 100%;
	width: 50%;
	right: 0;
	background: url(https://images.unsplash.com/photo-1521999693742-4717d76f97cc?ixlib=rb-1.2.1&auto=format&fit=crop&w=749&q=80) no-repeat 50% 0%;
	background-size: cover;
}

.dual__content {
	position: relative;
	width: 40%;
	display: flex;
	flex-direction: column;
	justify-content: center;
	min-height: 500px;
	padding: 1.5em 2.5em;
	font-size: 1.25em;
	line-height: 1.4;
    color: #ffffff;
    opacity:0;
}

.dual__content.dual__content--show {
	opacity: 1;
	pointer-events: visible;
	transform: translate(0,0);
	-webkit-transform: translate(0,0);
	-moz-transform: translate(0,0);
	-ms-transform: translate(0,0);
	-o-transform: translate(0,0);
}

@media screen and (max-width: 50em) {
	
	.content--full {
		min-height: 0;
	}
	.content__title {
		font-size: 2em;
	}
	.content__title--medium  {
		font-size: 1.75em;
	}
	.content__title--small {
		font-size: 1.15em;
	}
	.content__title--half {
		width: 100%;
	}
	.content__title--right {
		padding: 0 5vw;
	}
	.content__title--left {
		margin-left: 0;
	}
	.flexy--row {
	    flex-direction: column;
	}
	.triggers {
		width: 100%;
		border: 0;
		padding: 0;
		font-size: 0.85em;
	}
	.dual__content {
		min-height: 200px;
		font-size: 0.65em;
		padding: 2.5em;
	}
	.dual {
		margin-top: 0;
	}
}
!

JS 

              
                window.onload = showThemColors();


function showThemColors() {
    var counter = 0;
    var rfx1 = document.querySelector('#rfx1');
    var rfx2 = document.querySelector('#rfx2');
    var rfx3 = document.querySelector('#rfx3');
    var rfx4 = document.querySelector('#rfx4');
    var btn1 = document.querySelectorAll('#rev-trigger-1')[0];
    var btn2 = document.querySelectorAll('#rev-trigger-2')[0];
    var btn3 = document.querySelectorAll('#rev-trigger-3')[0];
    var btn4 = document.querySelectorAll('#rev-trigger-4')[0];
    var btn5 = document.querySelectorAll('#rev-trigger-5')[0];
    var btn6 = document.querySelectorAll('#rev-trigger-6')[0];
    var btn7 = document.querySelectorAll('#rev-trigger-7')[0];
    var btn8 = document.querySelectorAll('#rev-trigger-8')[0];
    var btn9 = document.querySelectorAll('#rev-trigger-9')[0];
    var btn10 = document.querySelectorAll('#rev-trigger-10')[0];
    var btn11 = document.querySelectorAll('#rev-trigger-11')[0];
    var btn12 = document.querySelectorAll('#rev-trigger-12')[0];
   
    
    var revealSettings = {
        bgColors: ['#111'],
        duration: 600,
        delay: 100,
        direction: 'lr',
        onStart: function (contentEl, revealerEl) {
        },
        onHalfway: function (contentEl, revealerEl) {
            contentEl.style.opacity = 1;
        },
        onComplete: function () {
            revealerEffect2.reveal();
        }
    };
    var revealSettings2 = {
        bgColors: ['#111'],
        duration: 400,
        delay: 100,
        direction: 'lr',
        onHalfway: function (contentEl, revealerEl) {
            contentEl.style.opacity = 1;
        }
    };
    var revealSettings3 = {
        bgColors: ['#FFB900','#FF8C00','#F7630C','#E74856','#E81123','#0078D7','#0063B1'],
        duration: 400,
        delay: 100,
        direction: 'lr',
        onStart: function (contentEl, revealerEl) {
            anime.remove(contentEl);
            //  contentEl.style.opacity = 0;
        },
        onHalfway: function (contentEl, revealerEl) {
            contentEl.style.opacity = 1;
        }
    };


    var revealerEffect = new RevealFx(rfx1, {
        layers: 1,
        isContentHidden:false,
        revealSettings: revealSettings
    });
    var revealerEffect2 = new RevealFx(rfx2, {
        layers: 1,
        isContentHidden : true,
        revealSettings: revealSettings2
    });

    var splitContent = document.querySelector('.dual__content'),
    revealEffect3 = new RevealFx(rfx3, {
        isContentHidden:true,
        layers:4,
        revealSettings : {
            bgColors: ['#2c2c38','#2c2c38','#2c2c38','#2c2c38'],
            direction: 'rl',
            duration: 800,
            easing: 'easeInOutCirc',
            coverArea: 50,
            onStart: function(contentEl)
            {
                contentEl.style.opacity =0;
                splitContent.classList.remove('dual__content--show');
            },
            onHalfway: function(contentEl, revealerEl) {
                contentEl.style.opacity = 1;
                splitContent.classList.add('dual__content--show');
            }
        }
    });
    var revealerEffect4 = new RevealFx(rfx4, {
        layers: 7,
        isContentHidden : true,
        revealSettings: revealSettings3
    });
    

    revealerEffect.reveal();
    revealEffect3.reveal();
    revealerEffect4.reveal();

    btn1.onclick = function(){
        revealSettings.direction = 'lr';
        revealSettings2.direction = 'lr';
        revealerEffect.reveal(revealSettings);
    }
    btn2.onclick = function() {
        revealSettings.direction = 'rl';
        revealSettings2.direction = 'rl';
        revealerEffect.reveal(revealSettings);
    }
    btn3.onclick = function() {
        revealSettings.direction = 'tb';
        revealSettings2.direction = 'tb';
        revealerEffect.reveal(revealSettings);
    }
    btn4.onclick = function() {
        revealSettings.direction = 'bt';
        revealSettings2.direction = 'bt';
        revealerEffect.reveal(revealSettings);
    }
    btn5.onclick = function() {
      
      revealSettings.bgColors[0] = '#283593';
      revealSettings2.bgColors[0] = '#FBC02D';
      revealerEffect.reveal(revealSettings);
    }
    btn6.onclick = function(){
       revealEffect3.reveal();
    }
    btn7.onclick = function(){
        revealSettings3.coverArea = Math.random(1)*100+10;
        revealSettings3.onComplete = function(contentEl,revealEl){
            btn7.innerText = 'cover area has changed to '+revealSettings3.coverArea+'%';
        }
        revealerEffect4.reveal(revealSettings3);
    }
    btn8.onclick = function()
    {
        revealSettings3 = resetTheSetting();
        revealSettings3.duration = Math.random(1)*1000 + 1000;
        revealerEffect4.reveal(revealSettings3);
    }
    btn9.onclick = function()
    {
        revealSettings3 = resetTheSetting()
        revealSettings3.delay = Math.random(1)*100 + 200;
        revealerEffect4.reveal(revealSettings3);
    }
    btn10.onclick = function()
    {
        var quotations = ['Inhale confidence,exhale doubts','Do it or watch yourself sad when others show it','Be yourself,because everyone else is taken'];
        
        revealSettings3 = resetTheSetting()
        revealSettings3.onHalfway =  function(contentEl)
        {
            contentEl.innerText = quotations[counter++];
        }
        if(counter>quotations.length-1)
        counter = 0;
        revealerEffect4.reveal(revealSettings3);
    }
    btn12.onclick = function() {
        revealSettings3 = resetTheSetting();
        var resetRevealSettings = resetTheSetting();
        revealerEffect4.reveal(resetRevealSettings);
    }
    btn11.onclick = function() {
        revealSettings3 = resetTheSetting();
        revealSettings3.easing = 'cubicBezier(0.000, 0.810, 0.230, 0.990)';
        revealerEffect4.reveal(revealSettings3);
    }
    resetTheSetting = function()
    {
        return {
            bgColors: ['#FFB900','#FF8C00','#F7630C','#E74856','#E81123','#0078D7','#0063B1'],
            duration: 400,
            delay: 100,
            direction: 'lr',
            onStart: function (contentEl, revealerEl) {
                anime.remove(contentEl);
                //  contentEl.style.opacity = 0;
            },
            onHalfway: function (contentEl, revealerEl) {
                contentEl.style.opacity = 1;
            }
        }
    }
}
!
999px

Console