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Stand-alone parallax scrolling library for mobile (Android + iOS) and desktop. No jQuery. Just plain JavaScript (and some love).

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Build Status

Please note:

skrollr hasn't been under active development since about September 2014 (check out the contributions graphs on https://github.com/Prinzhorn/skrollr/graphs/contributors) and I don't have any plans for doing major changes to it. Please consider this before using skrollr in production as problems with new browser versions, especially on mobile, will most definitely surface. To be honest, mobile support always sucked (because mobile browsers are hard) and you shouldn't compromise UX for some fancy UI effects. Ever.

skrollr 0.6.30

Stand-alone parallax scrolling JavaScript library for mobile (Android, iOS, etc.) and desktop in about 12k minified.

Designer friendly. No JavaScript skills needed. Just plain CSS and HTML.

Actually, skrollr is much more than "just" parallax scrolling. It's a full-fledged scrolling animation library. In fact, you can use it and still have no parallax scrolling at all. But I wanted to sound hip and use some buzz-words. By the way, skrollr leverages HTML5 and CSS3 ;-)

Resources

Plugins

Official

Third party

In the wild

Check out the wiki page for websites using skrollr and feel free to add your own website :). You can also shamelessly add yourself to the list here if you are offering paid skrollr support.

Further resources (tutorials etc.)

Moved to the wiki.

Documentation

First of all: look at the examples and read the source ;-). This might give you a feeling of how stuff works and you can see how some patterns can be implemented.

Abstract

skrollr allows you to animate any CSS property of any element depending on the horizontal scrollbar position. All you need to do is define key frames for each element at certain points in top scroll offset.

Other libraries require you to write JavaScript in order to define your animations. This introduces two main problems:

  • Animation and element are not at one place. In order to find out if any animations are defined for a given element, you have to scroll through many (sometimes thousands) of lines of JavaScript.
  • You have to learn a new syntax which is often very verbose and limited at the same time.

With skrollr, you put the definition of your key frames right where they belong (to the element) using a syntax you already know (plain CSS).

If you would rather have the keyframes inside a separate file, take a look at skrollr-stylesheets.

If you prefer to use JavaScript to define your animations make sure to take a look at ScrollMagic. It depends on both jQuery and the Greensock Animation Platform (GSAP) and gives you full control over every detail of your animations.

Let's get serious

First of all you want to include the skrollr.min.js file at the bottom of your document (right before the closing </body>) and then call skrollr.init(). Or you can place it inside the <head> if you want to, but make sure to call init() once the document has been loaded (e.g. jQuery's ready event or even window.onload).

	<script type="text/javascript" src="skrollr.min.js"></script>
	<script type="text/javascript">
	var s = skrollr.init();
	</script>
</body>

If you are using require.js to structure your project, you can use skrollr as a module as well.

require(['skrollr'], function(skrollr){
	var s = skrollr.init();
});

If you're familiar with CSS, you already know the style attribute. In order to create an animation you would need several, at least two, of them. That's what skrollr does. You use the HTML5 data- attributes to define multiple sets of styles (we call each of them keyframe) and skrollr interpolates between them.

Let's change the background-color of a div starting at #00f when the scrollbar is at the top and ending with #f00 when the user scrolled 500 pixels down

<div data-0="background-color:rgb(0,0,255);" data-500="background-color:rgb(255,0,0);">WOOOT</div>

View in browser

Lessons learned
  • Skrollr ensures that you can actually scroll down 500 pixels or more, even if there's not enough content. You can suppress this by using the forceHeight option.
  • You can't use #00f or #0000ff. You need to use rgb or hsl and explicitly decide which color space you want because they result in different animations (HSL is much cooler most of the time). Don't worry, the IE plugin teaches IE < 9 to display rgb and hsl correctly.

Now let's do a barrel roll at the same time

<div data-0="background-color:rgb(0,0,255);transform:rotate(0deg);" data-500="background-color:rgb(255,0,0);transform:rotate(360deg);">WOOOT</div>

View in browser

Lessons learned
  • Skrollr handles all these nasty CSS prefixes for you. Just -moz-relax and get yourself a cup of -webkit-coffee.

Now let the rotation bounce like it were a hip-hop video

<div data-0="background-color:rgb(0,0,255);transform[bounce]:rotate(0deg);" data-500="background-color:rgb(255,0,0);transform[bounce]:rotate(360deg);">WOOOT</div>

View in browser

Lessons learned

  • Skrollr allows non-linear animations. The so called easing functions can be used per-property by putting them in square brackets behind the property. There's a built-in list of easing functions (see below in the JavaScript section) and you can use your own functions by using the easings options.

Now you may have noticed that using 500 as a keyframe position is kind of random and the look depends on your browser size.

Let's have the animation end when the top of the element reaches the top of the viewport (element leaves the viewport)

<div data-0="background-color:rgb(0,0,255);transform[bounce]:rotate(0deg);" data-top="background-color:rgb(255,0,0);transform[bounce]:rotate(360deg);">WOOOT</div>

View in browser

Lessons learned

That's the end of this short intro. The following sections will explain some more things in detail.

If you're not a fan of data-attributes or if you're planning a big website where you want a better and more flexible structure, take a look at skrollr-stylesheets.

Mobile support

Starting with version 0.5.0 skrollr officially supports mobile browsers including Android and iOS. Furthermore, mobile support has been rewritten from scratch for skrollr 0.6.0.

The Problem with mobile and the solution

(If you're not interested in the details, just scroll down a bit to see what you need to do for mobile support.)

Some words on why this is an important milestone and why others failed: Mobile browsers try to save battery wherever they can. That's why mobile browsers delay the execution of JavaScript while you are scrolling. iOS in particular does this very aggressively and completely stops JavaScript. In short, that's the reason why many scrolling libraries either don't work on mobile devices or they come with their own scrollbar which is a usability nightmare on desktop. It was an important requirement while I developed skrollr that I don't force you to scroll the way I want it. skrollr on desktop uses a native scrollbar and you can scroll the way you want to (keyboard, mouse, etc.).

You just told me it doesn't work on mobile, but why does it? The answer is simple. When using skrollr on mobile you don't actually scroll. When detecting a mobile browser, skrollr disables native scrolling and instead listens for touch events and moves the content (more specific the #skrollr-body element) using CSS transforms.

What you need in order to support mobile browsers

Starting with skrollr 0.6.0 there's just one thing you need to do: Include an element on your page with the id skrollr-body. That's the element we move in order to fake scrolling. The only case where you don't need a #skrollr-body is when using position:fixed exclusively. In fact, the skrollr website doesn't include a #skrollr-body element. If you need both fixed and non-fixed (i.e. static) elements, put the static ones inside the #skrollr-body element.

Or to put it differently: On mobile the skrollr-body element is moved using CSS transforms. You can't have position:fixed or background-attachment:fixed inside elements which use CSS transforms as per CSS spec (http://meyerweb.com/eric/thoughts/2011/09/12/un-fixing-fixed-elements-with-css-transforms/). That's why those elements need to be outside of the skrollr-body element.

The skrollr-body element might be configured within the init-options.

AMD

Starting with 0.6.22 there's experimental AMD support. Please note that only skrollr core has AMD support so far. We will update the plugins in the future.

require(['skrollr'], function(skrollr){
	skrollr.init();
});

Absolute vs relative mode

Being only able to define key frames in absolute values is simply insufficient for some cases. For example, if you don't know exactly where an element will be in the document. That's why there are two modes for key frames, namely absolute and relative mode.

absolute mode (or document mode)

The key frames are defined as absolute values describing how much the document has been scrolled down.

The syntax is data-[offset]-[anchor], where offset can be any integer (0 is default) and anchor can be either start (default) or end. Either offset or anchor can be omitted in some situations. Here are some examples of key frames and their meaning.

  • data-0 = data-start = data-0-start: When the scroll top is 0.
  • data-100 = data-100-start: When the scroll top is 100.
  • data--100 = data--100-start: When the scroll top is -100 (sounds like nonsense, but keep in mind that interpolation will be relative to this point).
  • data-end = data-0-end: When offset is 0, but counting from the bottom of the document instead of from the top. In short: when you reach the bottom of the page.
  • data-100-end: 100px before we reach the bottom.
  • data--100-end: 100px after we reach the bottom (again, it's up to you whether you need it).

relative mode (or viewport mode)

Instead of defining key frames relative to the document (i.e. absolute), we are able to define them depending on the position of any element in relation to the viewport.

The syntax is data-[offset]-(viewport-anchor)-[element-anchor], where offset can again be any integer and defaults to 0. Both viewport-anchor (mandatory) and element-anchor (optional) can be one of top, center or bottom. If element-anchor is omitted, the value of viewport-anchor will be taken (just like with background-position). Here are some examples of key frames and their meaning.

  • data-top = data-0-top = data-top-top = data-0-top-top: When the element's top is aligned with the top of the viewport.
  • data-100-top = data-100-top-top: When the element's top is 100px above the top of the viewport.
  • data--100-top = data--100-top-top: When the element's top is 100px below the top of the viewport.
  • data-top-bottom = data-0-top-bottom: When the bottom of the element is at the top of the viewport (it's just not visible).
  • data-center-center = data-0-center-center: When the element is at the center of the viewport.
  • data-bottom-center = data-0-bottom-center: When the element's center is at the bottom of the viewport, thus the upper half of the element is visible.

By default the keyframes are triggered by the position of the element where the keyframes are described. However there are times when the position of a second element should trigger the first element's keyframes. The data-anchor-target attribute can be used in these cases. The data-anchor-target attribute accepts any CSS selector and the position of the first element on the page matching the selector will be used to trigger keyframes on the element where the attribute is defined. data-anchor-target requires IE 8 or greater.

Examples: <div data-anchor-target="#foo"> will have it's keyframes tiggered by the position of the #foo element. Any CSS selector can be used, i.e data-anchor-target=".bar:not(.bacon) ~ span > a[href]"

Note: If you need to support IE 7, then you may only use IDs as anchor-targets, i.e. #foo. The IE plugin maps querySelector to getElementById.

Here's an infographic for better understanding of anchors (click to open PDF):

Anchors Guide

Important: All those values will be calculated up-front and transformed to absolute mode. So if either the element's box height changes (height, padding, border) or the elements position within the document, you probably need to call refresh() (see documentation in JavaScript section below). Window resizing is handled by skrollr.

Percentage offsets

All offsets shown above are given in absolute pixel values, e.g. data-300 for 300px from the top or data-13-top-bottom for a 13px offset to the top-bottom anchor. As of skrollr 0.6.13 you can also have offsets as percentages of the viewport by appending a p to the number. For example data-75p for when you scrolled down 75% of the viewport or data-10p-center to have a 10% offset from the center anchor.

Hash navigation

Check out the skrollr-menu plugin.

Working with constants

I was lying to you. The syntax for absolute mode is not data-[offset]-[anchor] and for relative mode it's not data-[offset]-(viewport-anchor)-[element-anchor]. In both cases, offset can be preceded by a constant which can be passed to the init method. The name of the constant needs to be preceded with an underscore.

Example:

skrollr.init({
	constants: {
		foobar: 1337
	}
});
<div data-_foobar="left:0%;" data-_foobar--100="left:50%;" data-_foobar-100="left:100%;"></div>

<!--Equal to-->

<div data-1337="left:0%;" data-1237="left:50%;" data-1437="left:100%;"></div>

Valid characters for a constant are [a-z0-9_].

Dynamic constants

Starting with skrollr 0.6.19 the word "constants" doesn't quite fit anymore, but who cares.

You can now use functions and percentages as constants. They are automatically evaluated when the window is resized or if you call refresh.

skrollr.init({
	constants: {
		foo: function() {
			//Note: you can access the skrollr instance with `this` for things like `this.relativeToAbsolute`
			return Math.random() * 100;//trolololol
		},
		vh: '100p'
	}
});

CSS classes

skrollr will add a skrollr class to the HTML element when calling init and will remove a no-skrollr class if present. Additionally, it will add a skrollr-desktop or skrollr-mobile class depending on which it detects. This allows fallback CSS rules to create a good user experience on unsupported devices or when JavaScript or skrollr are disabled.

All elements under skrollr's control (elements with appropriate data-attributes) will get the skrollable class. In addition, we add either the skrollable-before, skrollable-between or skrollable-after class, depending on whether the current scroll position is before, between or after the first/last (smallest/largest) keyframe of an element.

Animating attributes

Starting with skrollr 0.6.24 you can also animate attribute and not just style properties. This is especially a big thing because in the SVG world many properties are implemented as attributes and not in CSS. Animating an attribute couldn't be simplier, just prefix the property with an @ symbol!

<polygon
	points='426,720   -200,720   -200,0   955,0'
	data-0="@points:426,720   -200,720   -200,0   955,0"
	data-500="@points:380,720   -200,720   -200,0   1302,0">
</polygon>

Note: as always, skrollr doesn't do any magic. It doesn't understand what a polygon or points are. It's only interpolating numbers, that's it. So make sure you have the same number of numbers in your keyframes (8 in this case).

Filling missing values

Imagine the following animation

<div data-100="left:0%;" data-200="top:0%;" data-300="left:50%;" data-400="top:50%;"></div>

One could expect left to have a value of 25% at keyframe 200. That is not the case. By design, skrollr only interpolates values between key frames which are direct neighbors. What actually happens is that skrollr internally fills out all holes once from left and then from right. So the above is equivalent to

<div data-100="left:0%;top:0%;" data-200="left:0%;top:0%;" data-300="left:50%;top:0%;" data-400="left:50%;top:50%;"></div>

Preventing interpolation

The reason why skrollr is so lightweight and powerful is because it literally interpolates every number it can find. If you want to prevent some side effect, you can suppress interpolation for a specific value by prepending an exclamation point.

Example:

<!-- This will get your image url f***** up because there's no "kitten1.4561799.jpg" and the like -->
<div data-0="background-image:url(kitten1.jpg);" data-100="background-image:url(kitten2.jpg)"></div>

<!-- Better -->
<div data-0="background-image:!url(kitten1.jpg);" data-100="background-image:!url(kitten2.jpg)"></div>

Note: The values for both keyframes (if they contain a number) need to be prefixed if you want to avoid skrollr throwing an exception at you!

Limitations

There are some limitations of skrollr you should be aware of.

  • All numeric values have to have the same unit, even 0 needs a unit. It's not possible to animate from 5% to 100px. skrollr won't complain, but results are undefined.
  • Animations between values which are composed of multiple numeric values like margin:0 0 0 0; are only possible for the same number of values. margin:0px 0px 0px 0px; to margin:0px 100px 50px 3px; is fine, but not margin:10px; to margin:5px 10px;.
  • Animations between CSS transforms only work when they use the same functions in same order. From rotate(0deg) scale(1) to rotate(1000deg) scale(5) is fine.
  • Color animations don't support named values like "red" or hex values like "#ff0000". Instead, you have to use rgb(), rgba(), hsl() and hsla(). Don't worry, there's a skrollr plugin for IE < 9 to support hsl() (without "a"!) and to fall rgba back to rgb.
  • Color animations only work for same color functions. hsl() to hsl() or hsla() is fine, but not rgb() to hsl(). Which makes sense, because animating from the same colors in rgb space and in hsl space results in different animations (hsl gives you the nice rainbow stuff).

But feel free to send in a pull request to fix any of them. Just keep in mind that keeping skrollr as lightweight as possible has high priority.

JavaScript

On the JavaScript part there's not much to do (you can, if you want to!). So if you only know CSS and HTML, perfect.

skrollr.init([options])

All there is to do is to call skrollr.init([options]); which returns an instance of the singleton skrollr class. Subsequent calls to init() will just return the same skrollr instance again.

Possible options for init() are

smoothScrolling=true

Smooth scrolling smoothens your animations. When you scroll down 50 pixels, the animations will transition instead of jumping to the new position.

The global setting can be overridden per element by setting data-smooth-scrolling to on or off.

smoothScrollingDuration=200

The number of milliseconds the animations run after the scroll position changed the last time.

constants={}

An object containing integers as values. The keys can contain [a-z0-9_]. They do not need a leading underscore.

Example: data-_myconst-200 and skrollr.init({constants: {myconst: 300}}) result in data-500.

scale=1

By default, skrollr uses the largest key frame and makes document height + viewport height this high, thus the max possible scroll top offset. If your animation runs too fast or too slow, just adjust the scale value.

scale only affects keyframes in absolute mode.

When forceHeight is set to false, scale is ignored.

scale affects constants as well.

scale does only affect key frames in absolute mode, e.g. data-500 but not data-top.

###forceHeight=true

true: Make sure the document is high enough that all key frames fit inside. Example: You use data-1000, but the content only makes the document 500px high. skrollr will ensure that you can scroll down the whole 1000px. Or if you use relative mode, e.g. data-top-bottom, skrollr will make sure the bottom of the element can actually reach the top of the viewport.

false: Don't manipulate the document and just keep the natural scrollbar.

###mobileCheck=function() {...}

This option allows you to pass a function to skrollr overwriting the check for mobile devices. The function should return true when mobile scrolling should be used and false if not.

The default looks like this

function() {
	return (/Android|iPhone|iPad|iPod|BlackBerry/i).test(navigator.userAgent || navigator.vendor || window.opera);
}

mobileDeceleration=0.004

The amount of deceleration for momentum scrolling on mobile devices. This options tells skrollr how fast or slow you want the scrolling to stop after the user lifted his finger.

Set it to 1 to disable momentum scrolling.

skrollrBody='skrollr-body'

This option allows you to override the default id-selector used for supporting mobile browsers. It might come in handy when the element in question already has a assigned id or if you would like to define more then one skrollrBody depending on preceding JavaScript-logic.

edgeStrategy='set'

This option specifies how to handle animations when the scroll position is outside the range on the keyframes (i.e. before the first or after the last keyframe).

One of three options are possible

  • set (default): When before/after the first/last keyframe, apply the styles of the first/last keyframe to the element.
  • ease: Same as set, but the values will be transformed using the given easing function.
  • reset: When before/after the first/last keyframe, apply the styles which the element had before skrollr did anything. This means resetting the class attribute as well as removing all styles which have been applied to the style property. This means the element won't have any skrollable-* CSS classes.

Example:

Given the following element with two keyframes

<div data-1000="left:0%;top:0%;" data-2000="left:50%;top:100%;" style="left:-100%;" class="section"></div>

and the following easing function which always returns 0.5 (I know it's pointless, but it's just an example. A real world example would be an easing function that represents a curve and starts somewhere between 0 and 1, but not at 1)

function(p) {
	return 0.5;
}

and imagine the scrollbar is at 237, which is below the first keyframe which is at 1000.

  • set will result in <div style="left:0%;top:0%;" class="section skrollable skrollable-before"></div> which is plain data-1000.
  • ease will result in <div style="left:25%;top:50%;" class="section skrollable skrollable-before"></div> which is 0.5 * data-1000.
  • reset will result in <div style="left:-100%;" class="section"></div> which is what the element originally had. Note how top is missing.

beforerender

A listener function that gets called each time right before we render everything. The function will be passed an object with the following properties:

{
	curTop: 10, //the current scroll top offset
	lastTop: 0, //the top value of last time
	maxTop: 100, //the max value you can scroll to. curTop/maxTop will give you the current progress.
	direction: 'down' //either up or down
}

Returning false will prevent rendering.

render

A listener function that gets called right after we finished rendering everything. The function will be passed with the same parameters as beforerender.

Example

skrollr.init({
	render: function(data) {
		//Log the current scroll position.
		console.log(data.curTop);
	}
});

keyframe

Experimental

In order to receive keyframe events from an element, add the data-emit-events attribute to the element. The keyframe function will be called with three arguments

  1. The element that passed the keyframe.
  2. The name of the keyframe, camel-cased (see example).
  3. The direction the user is scrolling.

Example:

<div
	data-500="..."
	data-top-bottom="..."
	data-_offset-center="..."
	data-emit-events
>
	Some content
</div>
skrollr.init({
	keyframe: function(element, name, direction) {
		//name will be one of data500, dataTopBottom, data_offsetCenter
	}
});

Note: this is experimental, expect the API to change! Originally I wanted to emit the events right on the element, so you could do this

//Wouldn't this be nice?
document.querySelector('#foo').addEventListener('skrollr.dataTopBottom.up', function() {
	//#foo just passed the data-top-bottom keyframe while scrolling up
}, false)

but IE.

easing

An object defining new easing functions or overwriting existing ones. Easing functions get just one argument, which is a value between 0 and 1 (the percentage of how much of the animation is done). The function should return a value between 0 and 1 as well, but for some easings a value less than 0 or greater than 1 is just fine.

An easing function basically transforms the timeline for an animation. When the animation should be 50% done, you can transform it to be 90% done or whatever your function does.

Example:

skrollr.init({
	easing: {
		//This easing will sure drive you crazy
		wtf: Math.random,
		inverted: function(p) {
			return 1 - p;
		}
	}
});

You can now use the easing functions like any other.

skrollr ships with some built in functions:

  • linear: The default. Doesn't need to be specified.
  • quadratic: To the power of two. So 50% looks like 25%.
  • cubic: To the power of three. So 50% looks like 12.5%
  • begin/end: They always return 0 or 1 respectively. No animation.
  • swing: Slow at the beginning and accelerates at the end. So 25% -> 14.6%, 50% -> 50%, 75% -> 85.3%
  • sqrt: Square root. Starts fast, slows down at the end.
  • outCubic
  • bounce: Bounces like a ball. See https://www.desmos.com/calculator/tbr20s8vd2 for a graphical representation.

Custom easing

  • Use this generator
  • Insert the given polynomial coeficients instead of t, t2, t3, t4 and t5
t5*(p*p*p*p*p) + t4*(p*p*p*p) + t3*(p*p*p) + t2*(p*p) + t*p

Example shown with the values for easeOutElasticBig

easeOutElasticBig: function(p) {
  return 56*(p*p*p*p*p) - 175*(p*p*p*p) + 200*(p*p*p) - 100*(p*p) + 20*p;
}

skrollr.get()

Returns the skrollr instance if init() has been called before or undefined.

Public API

Calling init() returns an instance of skrollr which exposes a public api.

refresh([elements])

Reparses all given elements. You can pass a single element or an array-like element (Array, NodeList or jQuery object)

Useful when

  • Elements in relative mode change and need to be updated.
  • Data-attributes are manipulated dynamically.
  • New elements are added to the DOM and should be controlled by skrollr.

When no elements are given, all elements in the document will be parsed again. In fact, when calling skrollr.init() skrollr uses refresh() without parameters internally.

Time consuming operations, should not be called on every rendering.

relativeToAbsolute(element, viewportAnchor, elementAnchor)

Returns an integer which represents the absolute scroll position which correlates to the relative anchor.

element must be a DOM element.

viewportAnchor and elementAnchor must be one of top, center or bottom

Example:

var offset = s.relativeToAbsolute(document.getElementById('foo'), 'top', 'bottom');

//offset contains the scroll position at which #foo's bottom is at the top of the viewport.
//If you now use setScrollTop(offset) or animateTo(offset) #foo's bottom will be perfectly aligned with the top of the viewport. Yay.

getScrollTop()

Returns the current scroll offset in pixels. Normalizes different browser quirks and handles mobile scrolling.

getMaxScrollTop()

Returns the number of pixels that can be scrolled down in total. If forceHeight is true, that's usually the largest keyframe. Otherwise it's the height of the document minus the viewport height.

setScrollTop(top[, force = false])

Sets the top offset using window.scrollTo(0, top) on desktop or updating the internal state in case of mobile scrolling.

When force is set to true, skrollr will jump to the new position without any kind of transition. By default, the global smoothScrolling setting applies.

isMobile()

Returns if skrollr runs in mobile mode (see also mobileCheck option).

animateTo(top[, options])

Animates the scroll position from current position to top. Possible options are

duration

How long the animation should run in milliseconds. The default is 1000 or one second.

easing

The name of an easing function. The same functions can be used as for property animations. Default is linear .

done

A function to be called after the animation finished. When you pass a top value, which is the same as the current, then the function will be called immediately. The function gets a boolean argument interrupted which indicates if the animation was interrupted by stopAnimateTo or finished to the end.

stopAnimateTo()

Stops the animation and calls the done callback passing true as interrupted arguments.

isAnimatingTo()

Returns if an animation caused by animateTo is running.

on(name, fn)

Set a listener function for one of the events described in the options section (beforerender, render, keyframe). Only one listener can be attached at a given time. This method overwrites the current listener, if any.

off(name)

Removes the listener for the given event.

destroy()

Destroys skrollr. All class and style attributes will be set to the values they had before.

Changelog

See HISTORY.md.

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Stand-alone parallax scrolling library for mobile (Android + iOS) and desktop. No jQuery. Just plain JavaScript (and some love).

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