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HTML

              
                <form action="">
	<label for="tweet">Send something, and it’ll morph into a bird and fly out!</label>
    <textarea id="tweet" rows="3" placeholder="What’s happening?"></textarea>
	<div class="bottom">
		<span data-limit="280">280</span>
		<button type="submit" tabindex="0" disabled>
			<span tabindex="-1">Tweet</span>
		</button>
	</div>
	<div class="svgs">
		<svg version="1.1" xmlns="http://www.w3.org/2000/svg" x="0px" y="0px" width="540px" height="306px" viewBox="0 0 540 306" enable-background="new 0 0 540 306">
			<path id="b1" fill="#55ABEE" d="M540,189c0,4.971-4.029,9-9,9c0,0-310.125,0-413.5,0C90.375,198,9,198,9,198c-4.971,0-9-4.029-9-9
		c0,0,0-12.375,0-16.5c0-3,0-9,0-12c0-1.625,0-4.875,0-6.5s0-4.875,0-6.5c0-2.875,0-8.626,0-11.501c0-2,0-6,0-8
		C0,125.249,0,117,0,117c0-4.971,4.029-9,9-9h355h18.5H531c4.971,0,9,4.029,9,9c0,0,0,13.875,0,18.5c0,4,0,12,0,16c0,3.5,0,10.5,0,14
		C540,171.375,540,189,540,189z"/>
		</svg>
		<svg version="1.1" xmlns="http://www.w3.org/2000/svg" x="0px" y="0px" width="540px" height="306px" viewBox="0 0 540 306" enable-background="new 0 0 540 306">
			<path id="b2" fill="#55ABEE" d="M373.925,5.634c-8.719,8.862-18.389,15.302-28.671,18.77C337.035,9.381,325.302,0,312.316,0
			c-24.92,0-45.126,34.591-45.126,77.254c0,6.056,0.403,11.931,1.158,17.593c-37.507-3.225-70.762-33.978-93.023-80.708
			c-3.879,11.396-6.116,24.674-6.116,38.836c0,26.789,7.986,50.439,20.084,64.285c-7.392-0.404-14.358-3.875-20.444-9.648
			c0,0.316,0,0.647,0,0.968c0,37.424,15.561,68.646,36.21,75.763c-3.792,1.758-7.774,2.703-11.901,2.703
			c-2.905,0-5.729-0.482-8.492-1.391c5.757,30.676,22.417,53.025,42.165,53.648c-15.451,20.723-34.904,33.076-56.06,33.076
			c-3.653,0-7.23-0.373-10.772-1.084C179.982,293.209,203.717,306,229.192,306c83.023,0,128.416-117.699,128.416-219.785
			c0-3.345-0.03-6.692-0.116-9.999c8.806-10.885,16.467-24.49,22.51-39.998c-8.088,6.159-16.785,10.293-25.923,12.166
			C363.404,38.823,370.545,23.687,373.925,5.634z"/>
		</svg>
		<svg version="1.1" xmlns="http://www.w3.org/2000/svg" x="0px" y="0px" width="540px" height="306px" viewBox="0 0 540 306" enable-background="new 0 0 540 306">
			<path id="b3" fill="#55ABEE" d="M394.709,51.297c-10.461,6.115-22.064,10.561-34.402,12.953c-9.863-10.367-23.943-16.842-39.525-16.842
			c-29.902,0-54.152,23.871-54.152,53.314c0,4.18,0.483,8.235,1.39,12.145c-45.009-2.229-84.914-23.451-111.628-55.701
			c-4.655,7.867-7.339,17.027-7.339,26.803c0,18.488,9.583,34.811,24.101,44.367c-8.87-0.281-17.229-2.674-24.533-6.66
			c0,0.219,0,0.447,0,0.668c0,25.826,18.673,47.375,43.452,52.285c-4.549,1.213-9.328,1.867-14.281,1.867
			c-3.486,0-6.874-0.334-10.19-0.959c6.908,21.17,26.9,36.594,50.597,37.025c-18.541,14.301-41.885,22.826-67.271,22.826
			c-4.383,0-8.677-0.256-12.927-0.748c23.979,15.125,52.462,23.951,83.031,23.951c99.628,0,154.096-81.23,154.096-151.685
			c0-2.307-0.036-4.618-0.141-6.897c10.568-7.514,19.763-16.903,27.014-27.604c-9.705,4.25-20.143,7.104-31.107,8.396
			C382.084,74.204,390.654,63.756,394.709,51.297z"/>
		</svg>
		<svg version="1.1" xmlns="http://www.w3.org/2000/svg" x="0px" y="0px" width="264px" height="214px" viewBox="0 0 264 214" enable-background="new 0 0 264 214">
			<path id="b4-1" fill="#55ABEE" d="M264.001,26.405c-9.705,4.25-20.144,7.104-31.106,8.396c11.189-6.597,19.76-17.045,23.814-29.504
	c-10.461,6.115-22.064,10.561-34.402,12.953c-9.863-10.367-23.941-16.842-39.523-16.842c-29.902,0-54.152,23.871-54.152,53.314
	c0,4.18,0.483,8.235,1.39,12.145c-0.02-0.001-0.04-0.003-0.06-0.004c1.289,26.137-6.044,41.72-14.711,57.387
	c-10.75,18.5-27.75,37.5-35.805,42.872c-18.419,13.956-41.469,22.267-66.515,22.267c-4.383,0-8.677-0.256-12.927-0.748
	c23.979,15.125,52.462,23.951,83.031,23.951c99.628,0,154.096-81.23,154.096-151.685c0-2.307-0.036-4.618-0.142-6.897
	C247.555,46.496,256.75,37.106,264.001,26.405z"/>
			<path id="b4-2" fill="#55ABEE" d="M54.073,128.629c-4.549,1.213-9.328,1.867-14.281,1.867c-3.486,0-6.874-0.334-10.19-0.959
				c6.908,21.17,26.9,36.594,50.597,37.025c-0.108,0.083-0.221,0.16-0.329,0.243c1.245,0.027,2.477,0.117,3.696,0.376
				c8.178-0.742,16.029-1.338,23.741-4.563c5.559-2.325,11.182-5.499,15.883-9.283c10.015-8.062,18.012-18.157,23.113-30.003
				c8.144-18.915,11.361-53.553-16.355-56.82c0.027,0.118,0.045,0.238,0.072,0.356C85.011,64.639,45.106,43.417,18.392,11.167
				c-4.655,7.867-7.339,17.027-7.339,26.803c0,18.488,9.583,34.811,24.101,44.367c-8.87-0.281-17.229-2.674-24.533-6.66v0.668
				C10.621,102.17,29.294,123.719,54.073,128.629z"/>
		</svg>
	</div>
</div>
              
            
!

CSS

              
                *, *::before, *::after {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}
body, button, textarea {
	font-family: "Helvetica Neue", Helvetica, sans-serif;
	font-size: 18px;
}
body, textarea {
	color: #222;
}
body {
	height: 100vh;
	overflow: hidden;
}
form, svg, .svgs {
	position: absolute;
}
/* SVGs */
.svgs {
	top: 0;
	left: 0;
	transform: translateY(-4em);
	z-index: -1;
}
svg {
	display: block;
}
.svgs, svg:nth-of-type(n + 2):nth-of-type(-n + 4) {
    visibility: hidden;
}
svg:not(:last-of-type) {
	width: 30em;
	height: 17em;
}
svg:last-of-type {
	top: 8.5em;
	left: 15em;
	width: 14.67em;
	height: 11.88em;
	transform: translate(-50%,-50%);
}
/* Tweet form */
form {
	margin: auto;
	top: 50%;
	left: 50%;
	width: calc(100% - 3em);
	max-width: 30em;
	transform: translate(-50%,-50%);
}
button, button span {
	border-radius: 1.5em;
}
button {
	background-color: #55abee;
	border: 0;
	color: #fff;
	display: inline-block;
	font-weight: bold;
}
button span {
	display: block;
	padding: 0.75em 1.5em;
	transition: all 0.1s linear;
}
button:hover span {
	background-color: rgba(255,255,255,0.2);
}
button:active span {
	background-color: rgba(0,0,0,0.2);
}
button span:focus {
	outline: 0;
}
button:disabled {
	opacity: 0.5;
}
button:disabled:hover span, 
button:disabled:active span {
	background-color: transparent;
}
label {
	display: block;
	margin-bottom: 0.75em;
}
textarea {
	border: 0;
	border-radius: 0.5em;
	box-shadow: 0 0 0 0.1em #a8ceee inset;
	margin: 0 auto 0.75em auto;
	padding: 0.75em;
	resize: none;
	width: 100%;
	height: 5em;
}
textarea:focus {
	box-shadow: 0 0 0 0.1em #55abee inset;
	outline: 0;
}
textarea::placeholder {
	color: #aaa;
}
.bottom {
	display: flex;
	justify-content: flex-end;
	align-items: center;
}
.bottom > span {
	margin-right: 0.75em;
}
.warn {
  color: #c00;
}
/* Pre-morphing stage */
.pre-morph > .svgs {
	visibility: visible;
	animation: flyAway 1.5s 1s ease-in-out forwards;
}
.pre-morph svg:last-of-type {
	animation: appear 1s 0.65s linear forwards;
}
.pre-morph svg:last-of-type path:last-child {
	animation: flap 0.5s 1s linear infinite;
}
.pre-morph > *:nth-child(n + 1):nth-child(-n + 3) {
	animation: fadeOut 0.2s linear forwards;
}
@keyframes fadeOut {
	from { opacity: 1; visibility: visible }
	to { opacity: 0; visibility: hidden }
}
@keyframes appear {
	from, to { visibility: visible }
}
@keyframes flyAway {
	from { transform: translate(0,-4em) }
	50% { transform: translate(0,-6em) scale(1); opacity: 1 }
	to { transform: translate(30em,-9em) scale(0); opacity: 0 }
}
@keyframes flap {
    from, to {
        transform: translate(7.75em, 4.99em) rotateY(0) translate(-7.75em, -4.99em);
    }
    50% {
        transform: translate(7.75em, 4.99em) rotateY(160deg) translate(-7.75em, -4.99em);
	}
}
              
            
!

JS

              
                document.addEventListener("DOMContentLoaded", function(){
	this.querySelector("textarea").addEventListener("keydown",ctChars);
	this.querySelector("form").addEventListener("submit",tweet);
});

function ctChars() {
	let el = this,
		to = setTimeout(function() {
			let len = el.value.length,
				ct = document.querySelector("span"),
				btn = document.querySelector("button"),
				warnAt = 20,
				max = ct.getAttribute("data-limit");
			
			// characters left
			ct.innerHTML = max - len;
			// warn about reaching limit
			ct.className = len > max - warnAt ? "warn" : "";
			btn.disabled = len == 0 ? true : false;
			clearTimeout(to);
		}, 1);
}
function tweet(e) {
	let el = this,
		ta = el.querySelector("textarea");
	el.classList.add("pre-morph");
	ta.disabled = true;
	
	// bird animation
	var tl = new TimelineMax();
	tl
		.to("#b1", 0.2, {
			delay: 0.2,
			morphSVG:"#b2",
			ease: Linear.easeIn
		})
		.to("#b1", 0.25, {
			morphSVG:"#b3",
			ease: Linear.easeIn
		})
		.to("#b1", 0, {
			delay: 0.05,
			opacity: 0
		});
	
	// reset everything
	setTimeout(function(){
		let ct = el.querySelector("span"),
			btn = el.querySelector("button");

		el.classList.remove("pre-morph")
		ta.value = "";
		ta.disabled = false;
		ct.innerHTML = ct.getAttribute("data-limit");
		btn.disabled = true;
		tl.pause(0);
	}, 3000);
	
	e.preventDefault();
}
              
            
!
999px

Console