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How to build a CSS animation that "slides in", revealing a text/div after it finishes sliding?

I am trying to mimic the CSS animations from a website here: https://stanographer.com/
I want to copy the way the site:
starts by showing a full screen black div sliding away to the right
"loads" the black background (div tags) behind text (as in "Hi, I'm Stanley Sakai"), expanding left to right and
"loads" the text over the black background div, expanding left to right.
Now you might ask, "Why not just inspect the page, look at the classes on the divs and text, then inspect the CSS sheet in the network tab?" And I've tried that. The CSS looks weird. My friend said it is pre-processed by SASS, whatever that means. Anyway, I cannot decipher the code.
I've been to a few different StackOverflow pages (here's one) & over a dozen different pages on Google. I learned about using keyframes but I haven't figured out how to recreate the effect on Stanographer.com. My friend, who owns the website, also provided this example, but I don't get how to apply it to individual divs. He said something about using the z-index but I just don't see it.
I know that to make the page start with a full black screen & then slide out, I have to trigger a class change using JavaScript. I have:
let blackStuff = document.getElementById("blackness");
window.addEventListener("load", () => {
console.log("loaded");
blackStuff.setAttribute("class", "black-box-out");
},
false
);
.black-box {
position: fixed;
float: left;
top: 0;
width: 100%;
height: 100%;
bottom: 0;
background-color: #000;
z-index: 999999;
-webkit-animation: powerslide 0.5s forwards;
-webkit-animation-delay: 2s;
animation: powerslide 0.5s forwards;
animation-delay: 2s;
}
#-webkit-keyframes powerslide {
100% {
left: 0;
}
}
#keyframes powerslide {
100% {
left: 0;
}
}
.black-box-out {
margin-left: 100%;
animation: slide 0.5s forwards;
-webkit-transition: slide 0.5s forwards;
transition: slide 0.5s forwards;
}
<div id="blackness" class="black-box"></div>
But this just makes the "blackness" div disappear instantly on page load. I want it to slide out. Clearly, I don't get how to use CSS animations.
If you are interested in seeing more of what doesn't work, read on. Otherwise, you can skip this section: it only shows my failed trials.
I've learned how to make a CSS animation expand horizontally from 0:
.wrapper {
position: relative;
overflow: hidden;
width: 500px;
height: 50px;
border: 1px solid black;
}
.slide-custom {
width: 500px;
height: 50px;
background: cyan;
position: relative;
-webkit-animation: slideIn 2s forwards;
animation: slideIn 2s forwards;
}
/* moz and webkit keyframes excluded for space */
#keyframes slideIn {
0% {
transform: scaleX(0);
}
100% {
transform: scaleX(1);
}
}
<div class="wrapper slide-custom">
<h1 class="slide-custom">
<span>MEET ROLY POLY.</span>
<!-- expands horizontally from 0 width to 100% width -->
</h1>
</div>
And I've learned to make text "slide in" from the left, though it starts at 100% width when I want it to start at 0% width:
/* CSS */
.test-slide {
animation-duration: 3s;
animation-name: testSlide;
}
#keyframes testSlide {
from {
margin-left: 0%;
width: 50%;
}
to {
margin-left: 100%;
width: 100%;
}
}
<div class="test-slide">
<h1><span>ABOUT.</span></h1>
<!-- will slide in from the left -->
</div>
There's more -- unfortunately none of it mimics the website I'm trying to copy.

Explanation
There are multiple ways to achieve what you want actually. I did not opt to animate width. The first few frames of the animation will be not as expected.
So instead, we can use clip-path. What clip-path basically does is masking. You can "crop" a div such that only a part of it is visible. We will utilise clip-path and ::before or ::after pseudo-element (either is fine) to create this animation. What we need to do:
Create the pseudo-element and position it such that it covers (is on top) the whole animatable element (position: absolute)
Set the pseudo-element's background to black
Using clip-path, mask the animatable element to display no parts of the element (this will also cause the pseudo-element to not be displayed as it is part of the element). The direction of the clipping is important. The direction here is from the right side to the left side.
Using animation and #keyframes, unmask the previously masked div. This will reveal it slowly from the left side to the right side (because initially, we masked it from the right to left; upon unmasking, the reverse direction happens)
Upon unmasking the element, the pseudo-element will be on top of the text we want to display
After a short while later, mask the pseudo-element (not the whole element) from the right direction to the left direction, again using clip-path so that the text seems revealed slowly
It works! However, I recommend reading about clip-path. Also, one really handy clip-path CSS generator I really like to use is this (if you want to clip from the right to left, you should drag the points from the right to left). I also highly recommend reading about CSS positioning (a staple in good CSS animations). You needn't be using z-index: 9999; you generally want to keep track of the z-index you use.
Solution
Here's a working solution using the described method. Try running it.
* {
box-sizing: border-box;
margin: 0;
padding: 0;
font-family: Helvetica;
}
body,
html {
width: 100%;
height: 100%;
}
#wrapper {
background: #555555;
width: 100%;
height: 100%;
color: white;
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
}
#wrapper * {
margin: 5px;
}
.heading {
font-size: 3em;
padding: 10px 5px;
}
.caption {
font-size: 1em;
padding: 5px;
font-family: Courier;
}
.animatable {
position: relative;
clip-path: polygon(0 0, 0 0, 0 100%, 0% 100%);
animation: .75s cubic-bezier(1,-0.01,.12,.8) 1s 1 reveal forwards;
}
.animatable::after {
content: '';
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: #20262b;
padding: inherit;
animation: .75s cubic-bezier(1,-0.01,.12,.8) 1.75s 1 hideBlack forwards;
}
#keyframes reveal {
from { clip-path: polygon(0 0, 0 0, 0 100%, 0% 100%); }
to { clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%); }
}
#keyframes hideBlack {
from { clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%); }
to { clip-path: polygon(100% 0, 100% 0, 100% 100%, 100% 100%); }
}
<div id="wrapper">
<div class="heading animatable">Hi, I am Richard!</div>
<div class="caption animatable">I am a person.</div>
</div>
Although the simple animation you wanted can be created using merely CSS, I still suggest you read about how to make animations using JavaScript and the various libraries it has in making animations. This is because once there are many animations and transitions going on, it becomes hard to keep track of animations (especially when you want animations to start after another animation ends). A good library is anime.js (do explore more options before settling on one). Furthermore, notice how the animations only appear upon scrolling down in the website you provided? That's doable only with JS (one such method is using IntersectionObserver API provided by most browsers).

Here you have some CSS3 animations, you trigger that animation when the .entrance-animation gets the .active class.
You'll need an observer to watch when the item gets into view and, when the item is visible, you add the .active class to it.
Hope it helps!
setTimeout(() =>
{
let animate = document.querySelectorAll('.entrance-animation');
animate.forEach(item => item.classList.add('active'));
}
,1000);
.entrance-animation
{
position: relative;
color: blueviolet;
white-space: nowrap;
font-size: 24px;
width: 0;
overflow: hidden;
transition: width 0.5s ease;
}
.entrance-animation::before
{
content: '';
position: absolute;
top: 0;
right: 0;
height: 100%;
width: 100%;
background-color: black;
z-index: 10;
transition: width 0.5s ease;
transition-delay: 0.5s;
}
.entrance-animation.active
{
width: 100%;
}
.entrance-animation.active::before
{
width: 0%;
}
<p class="entrance-animation">
Hello
</p>
<p class = "entrance-animation">
Here we are
</p>

You can use CSS3 transitions or maybe CSS3 animations to slide in an element.
For browser support: http://caniuse.com/
I made two quick examples just to show you how I mean.
CSS transition (on hover)
Demo One
Relevant Code
.wrapper:hover #slide {
transition: 1s;
left: 0;
}
In this case, Im just transitioning the position from left: -100px; to 0; with a 1s. duration. It's also possible to move the element using transform: translate();
CSS animation
Demo Two
#slide {
position: absolute;
left: -100px;
width: 100px;
height: 100px;
background: blue;
-webkit-animation: slide 0.5s forwards;
-webkit-animation-delay: 2s;
animation: slide 0.5s forwards;
animation-delay: 2s;
}
#-webkit-keyframes slide {
100% { left: 0; }
}
#keyframes slide {
100% { left: 0; }
}
Same principle as above (Demo One), but the animation starts automatically after 2s, and in this case I've set animation-fill-mode to forwards, which will persist the end state, keeping the div visible when the animation ends.
Like I said, two quick example to show you how it could be done.
EDIT: For details regarding CSS Animations and Transitions see:
Animations
https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Using_CSS_animations
Transitions
https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Using_CSS_transitions
Hope this helped.

How do I add a cycle style repeating image phase background to my website?

The question title says it all, I am not sure how to organize it in to my websites HTML due to the fixed menu bar, and its over all build. So to say, I want my website to have multiple backgrounds that fade in and out. I intend on adding more backgrounds over time. What I listed below is what I've been attempting to work with.
body {
width: 400px;
height: 400px;
}
/* set `#slideshow` parent background color */
.slideshow {
background: #000;
display:block;
width:inherit;
height:inherit;
}
#slideshow {
width: 100%;
height: 100%;
display: block;
opacity: 0.0;
background-color: #000;
/*
set background images as `url(/path/to/image)` here,
separated by commas
*/
background-image: url("http://lorempixel.com/400/400/cats/?1"),
url("http://lorempixel.com/400/400/animals/?2"),
url("http://lorempixel.com/400/400/nature/?3"),
url("http://lorempixel.com/400/400/technics/?4"),
url("http://lorempixel.com/400/400/city/?5");
background-size: cover, 0px, 0px, 0px;
/* set transtitions at 3000ms
-webkit-transition: background-image 3000ms linear;
-moz-transition: background-image 3000ms linear;
-ms-transition: background-image 3000ms linear;
-o-transition: background-image 3000ms linear;
transition: background-image 3000ms linear;
*/
}
Javascript below.
$(function() {
$.fx.interval = 0;
(function cycleBgImage(elem, bgimg) {
// `elem`:`#slideshow`
// set, reset, delay to `1000` after background image reset
elem.css("backgroundImage", bgimg)
// fade in background image
.fadeTo(3000, 1, "linear", function() {
// fade in background image
$(this).delay(3000, "fx").fadeTo(3000, 0, "linear", function() {
// split background image string at comma , creating array
var img = $(this).css("backgroundImage").split(","),
// concat first background image to `img` array,
// remove first background image from `img` array
bgimg = img.concat(img[0]).splice(1).join(",");
// recursively call `cycleBgImage`
cycleBgImage(elem, bgimg);
});
});
}($("#slideshow")));
});
The division script, which I'm not sure I have a use for unless I make my whole website one large div which seems pointless.
<div class="slideshow">

Here is a quick hack. I would probably do something more elegant with management of the images in an array, but this should get you going.
function swap(){
var $targets = $("#slideshow img");
var className = "active";
var $next = $targets.filter(".active").next();
if ($next.length === 0) { $next = $targets.first(); }
$targets.removeClass(className);
$next.addClass(className)
}
swap();
window.setInterval(swap, 5 * 1000);
#slideshow {
background-color: #000;
width: 400px;
height: 400px;
border: solid 1px;
overflow: hidden;
position: relative;
}
#slideshow img {
position:absolute;
opacity: 0;
transition: opacity 2s ease-in-out;
}
#slideshow img.active {
opacity: 1;
}
<div id="slideshow">
<img src="http://lorempixel.com/400/400/cats/?1" />
<img src="http://lorempixel.com/400/400/animals/?2" />
<img src="http://lorempixel.com/400/400/nature/?3" />
<img src="http://lorempixel.com/400/400/technics/?4" />
<img src="http://lorempixel.com/400/400/city/?5" />
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

Zoom Effect when Page is Loaded Doesn't Work as Wanted

I am trying to get an effect which is to zoom in on a logo centred on the page when the page is loaded. I am using the following HTML and JS code:
<div style="display: table-cell; vertical-align: middle; text-align: center;">
<img id="logo" src="images/logo2.png" style="zoom: 200%; transition: zoom 1s ease-in-out;"/>
</div>
JS
document.addEventListener("load", pageFullyLoaded, true);
function pageFullyLoaded()
{
var elem = document.getElementById("logo");
elem.style.zoom = "300%";
}
The result is really odd.
It display the logo in it's normal size,
then it jumps on a super zoomed in version of the logo (> 1000%),
zoom in on the logo even more (1000% to 1500% say) for the duration of the transition,
jump back to the normal logo size and position (which is correct, and this is the final positon and size I want).
So obviously this technique doesn't work:
the jump at the beginning is ugly but I only suppose this happens because 2) is incorrect anyway. As it should start by default with a zoom value of 200% (which is defined in the style of the div) and then the JS should make it zoom to 300%. So there should be no jump visible really.
I don't understand why I get this incredibly zoomed in version of the logo at the start of the animation. Basically it's almost like if the entire image was filling up the screen.
Any idea on how to do this reliably, please? Thank you.

I would do this in only CSS like so:
Set the image to scaleX and scaleY 0 (or hide it in some other way)
On $(window).load or $('document').ready add a class with keyframe animations
Do whatever you need afterwards.
Fiddle
$(window).load(function(){
$('img.zoom').addClass('element-animation');
});
You can also listen to animation end events like so https://github.com/daneden/animate.css#usage
That library (Animate.css) is also pretty handy and you might be able to find some useful effects in it.

If you're looking to scale an image, you don't need to use zoom or transform or anything. Just alter the width directly and the browser will scale the image for you:
http://jsfiddle.net/C4JZv/
HTML:
<div class="wrapper">
<img class="tiny" src="http://placehold.it/200x150" />
</div>
CSS:
.wrapper {
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
}
.wrapper img {
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
margin: auto;
transition: width 1s ease-in-out;
width: 200px;
}
.wrapper img.tiny {
width: 10px;
}
JS:
document.querySelector('.wrapper img').className = "";
EDIT: You mentioned in the comments that you wanted to see this done using transform. Again, it's just a case of having a shrunken image (using transform's scale), having a transition property and then removing the CSS class that shrinks the image:
http://jsfiddle.net/C4JZv/1/
HTML & JS: Same
CSS: Mostly the same, but with a couple of changes (plus a load of vendor prefixes):
.wrapper img {
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
margin: auto;
-webkit-transition: -webkit-transform 1s ease-out;
-moz-transition: -moz-transform 1s ease-out;
-ms-transition: -ms-transform 1s ease-out;
-o-transition: -o-transform 1s ease-out;
transition: transform 1s ease-out;
}
.wrapper img.tiny {
-moz-transform: scale(0.1);
-webkit-transform: scale(0.1);
-o-transform: scale(0.1);
-ms-transform: scale(0.1);
transform: scale(0.1);
}

How to zoom out a div using animations?

I have a DIV that is covering the whole page (height and width are 100%). I am trying to use CSS (and possibly JavaScript) to create a zoom out animation effect so the DIV is smaller (making everything inside the div - its children - smaller as well) to a specific point on the page (middle of the page) and to a specific width and height (let's say 100 * 100px for example).
I am starting with the following code:
<div id="toBeZoomedOut">
<div>something</div>
<div><img src="background.jpg"></div>
</div>
#toBeZoomedOut {
background-color: black;
border: 1px solid #AAAAAA;
color: white;
width: 300px;
height: 300px;
margin-left: auto;
margin-right: auto;
-webkit-transition: 1s ease-in-out;
-moz-transition: 1s ease-in-out;
transition: 1s ease-in-out;
}
#toBeZoomedOut img {
height: 250px;
width: 250px;
}
#toBeZoomedOut:hover {
zoom: 0.5;
}
The issue with this code is that it zooms out on component down (the parent div) and immediately zooms out what's inside it then goes back to zoom in the components.
Basically it is a little buggy. Any helpful fixes to make it zoom out everything together? It would be great if I can zoom out everything together to a specific location on the page and to a specific width/height (for example, zoom everything out to left: 100px, top: 100px and the parent div should be: 100px * 100px and everything else is relative in size).
I understand this might be easier with JavaScript? Any help?
One final note, if you notice the animation is not really reflecting a zoom animation. Although this would be an additional plus, the actual zoom animation would be great.
JSFiddle link to make it easier: http://jsfiddle.net/HU46s/

I am using the universal selector to target everything inside of the parent container to have the css transitions applied to it.
The next thing I did was changed the inside contents width to a % for ease of scaling.
Here is the css:
#toBeZoomedOut * {
-webkit-transition: all 1s ease;
-moz-transition: 1s ease;
transition: 1s ease;
}
Finally, a fiddle: Demo

To make all images and div backgrounds zoom at the same time you have to use percentage size for #zoomer-inside elements and set a specific font-sizes...
However is not smooth, if you want a smoother result, I suggest you use a jQuery in combination with some animation() method or plugin.
Fiddle: http://jsfiddle.net/HU46s/1/
Code:
#toBeZoomedOut {
background-color: black;
border: 1px solid #AAAAAA;
color: white;
width: 300px;
height: 300px;
margin-left: auto;
margin-right: auto;
-webkit-transition: all 1s ease-in-out;
-moz-transition: all 1s ease-in-out;
transition: all 1s ease-in-out;
}
#toBeZoomedOut div, #toBeZoomedOut img {
width: 90%;
font-size: 20px;
}
#toBeZoomedOut img {
height: 90%;
width: 90%;
}
#toBeZoomedOut:hover {
zoom: 0.5;
}
smoother by jQuery:
Fiddle: http://jsfiddle.net/HU46s/5/
Code:
jQuery - smoother solution (even less CSS):
$('#toBeZoomedOut').hover( /* change the animation speed as you want :) */
function(){
$(this).animate({ 'zoom': 0.5}, 400); //animation speed 400=0.4s !
},
function(){
$(this).animate({ 'zoom': 1}, 400); //animation speed 400=0.4s !
}
);
...with this only CSS you need is:
#toBeZoomedOut {
background-color: black;
border: 1px solid #AAAAAA;
color: white;
width: 300px;
height: 300px;
margin-left: auto;
margin-right: auto;
}
#toBeZoomedOut img {
width: 250px;
}

How to animate background image with jQuery

Hi I'm trying to animate a background image using jQuery, I tried following this tutorial here, however I've had no luck with my test page, I see the blue Facebook icon, but on mouse over it does not animate upwards to reveal the gray logo. Please help! Thanks, I'm a jQuery noob.
My test page:
http://leongaban.com/_stack/bg_animation/
The Facebook icon should animation upwards, the full image below:
My CSS
<style>
#facebook_icon li {
padding: 0;
width: 120px;
height: 119px;
list-style: none;
background: red;
background:url('img/fb_120x238.png') repeat 0 0;
}
</style>
HTML
<ul id="facebook_icon">
<li><div class="box"></div></li>
</ul>
Javascript
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
<script type="text/javascript" src="js/jquery.bgpos.js"></script>
<script>
(function() {
$('#facebook_icon li')
.css( {backgroundPosition: "0 0"} )
.mouseover(function(){
$(this).stop().animate(
{backgroundPosition:"(0 -119px)"},
{duration:500})
})
.mouseout(function(){
$(this).stop().animate(
{backgroundPosition:"(0 0)"},
{duration:500})
})
})();
</script>
UPDATE: WORKING CSS 3 Solution
CSS 3
#facebook_icon li {
padding: 0;
width: 120px;
height: 119px;
list-style: none;
background: red;
background:url('img/fb_120x238.png') repeat 0 0;
-moz-transition: background-position 1s;
-webkit-transition: background-position 1s;
-o-transition: background-position 1s;
transition: background-position 1s;
background-position: 0 0;
}
#facebook_icon li:hover{
background-position: 0 -119px;
}
.box {
width: 120px;
height: 119px;
}
HTML (Added empty div box to have something to click on)
<ul id="facebook_icon">
<li><div class="box"></div></li>
</ul>

A simple solution should be using the css3 transition.
You can do something like this:
In Your CSS
#facebook_icon li{
-moz-transition: background-position 1s;
-webkit-transition: background-position 1s;
-o-transition: background-position 1s;
transition: background-position 1s;
background-position: 0 0;
}
#facebook_icon li:hover{
background-position: 0 -119px;
}

This one is thankfully pretty simple. You are animating background-position on the anchor, but the actual image is on the li.
Just change your selector in your JavaScript:
$('#facebook_icon li')
However, I'd recommend changing your markup (and accompanying CSS) so the a is inside the li instead of a child of the ul. That way your markup is valid.
Update:
Hey, so I totally agree with using CSS3. Its exactly how I would implement that. But just to close out the question: To get the bgpos plugin working with jQuery 1.8.2, change the first two lines of the backgroundPosition method to this:
if (fx.start === 0 && typeof fx.end == 'string') {
var start = $.css(fx.elem,'backgroundPosition');