emoSVG 🙄

(Ugh). Progressively enhanced Emoji–first iconography pattern and utility.
Test it for yourself.

🤔 Why?

Sure, we could initially ship heavy and enhanced icons. But we want to progressively enhance the web. We start working within the limitations of HTML and utilize the interpretive nature of Emoji to initially deliver a growing and universal iconset that weight 0kB.

💅 Progressive Enhancement

There are several advantages to Emoji:

• fastest growing "language"
• 0kB cost to ship artwork
• interpretive

It's not all fun and games though. Emoji are interpative, meaning your art director might not be comfortable with the lack of control of what sighted users will see. There is no "pixel perfect" control with Emoji. They'll look different on different systems. This is where progressive enhancement comes in. If we detect, determine, or assume that it is worth the cost of shipping SVG artwork, we can overwrite our nearly weightless Emoji iconography with SVG icons.

SVG icons can be:

• animated
• any number of colors
• delivered efficiently together as a single sprite
• art directed with precision
• styled with CSS Variables

emoSVG will turn your Emoji into SVG graphics if and when you ask it to. To accomplish this, emoSVG needs to know one thing:

• the SVG graphic you'd like to replace the span.emoji with

Your SVG graphic can be a SVG file or part of an SVG sprite.

🏋️‍ Weigh In

emoSVG.min.js weights a whopping 881 bytes GZIPed and minified. Whoop—d—doo. That's not the point. Remember that the artwork you'll be replacing your Emoji with does way something. Keep that in mind and only pass this cost onto your users when appropriate.

🐛 Browser Support

emoSVG works in modern browsers. With the assistance of polyfills, it supports IE9+.
More on polyfills here.

🕰 When?

When you ship your SVG icons totally up to you. emoSVG just gives you a simple API to turn a span.emoji element into the appropriate enhanced markup. We recommend that you enhance Emoji into something else when:

• no save-data header is detected
• JavaScript is enabled
• user preferences opt into, or do not opt out of, the costs of enhanced iconography

🛠 Usage

emoSVG is installable via bower or by downloading this repository.

bower install emosvg --save

Use Emoji in your HTML. Wrap them in span.emoji. Or something else. Whatever.

<h1>
  <span class="emoji">🎉</span>
  &nbsp;Party! You're invited&nbsp;
  <span class="dancing emoji">💃</span>
</h1>

To progressively enhance Emoji you'll need to use the data-emosvg attribute to specify the path to the icon art. You'll also need a tiny bit of JavaScript.

🛍 SVG Use

Enhance Emoji with an SVG graphic from a sprite. Your graphic will be enhanced with the splendid <use> syntax.

<h1>
  <span class="emoji" data-emosvg="assets/img/fontawesome.svg#bicycle">🚲</span>
  &nbsp;Biking in Amsterdam
</h1>

becomes:

<h1>
  <svg>
    <use xlink:href="assets/img/fontawesome.svg#bicycle"></use>
  </svg>
  &nbsp;Biking in Amsterdam
</h1>

🌗 Replace Emoji with SVG using JavaScript

Then include the emoSVG.js or emoSVG.min.js script in your page:

<script src="assets/js/vendor/emoSVG/emoSVG.js"></script>

And finally use the JavaScript API to trigger the progressive enhancement.

You can enhance Emoji one at a time:

document.addEventListener("DOMContentLoaded", function() {
  const emoji = document.querySelector('.emoji');
  emoSVG(emoji);
});

You can also enhance any number of Emoji at once:

document.addEventListener("DOMContentLoaded", function() {
  const emoji = document.querySelectorAll('.emoji');
  emoSVG(emoji);
});

🌐 Universal Module Definition

emoSVG is packaged by Webpack as a UMD JavaScript module and can be universally used as such. So you can write your scripts how you want. Whatever.

global

<script src="./assets/js/emosvg.js"></script>
<script>emoSVG(emoji);</script> 

require()

const emoSVG = require('emosvg');
emoSVG(emoji);

💰 Cache Busting

In the distributed files you'll find a busted folder that contains unminified and minified versions of emoSVG with a cachebusted filename. We recommend you serve emosvg.*.*.*.min.js cachebusted with far future reaching expiry dates in production.

ls lib/emosvg/
busted  emosvg.js  emosvg.min.js  polyfill
 
ls lib/emosvg/busted/
emosvg.0.0.0.js  emosvg.0.0.0.min.js

🎨 SVG Graphic

Enhance Emoji with a single SVG file. Your graphic will be enhanced with an <img> element unless you specify otherwise.

<h1>
  <span class="emoji" data-emosvg="assets/img/bicycle.svg">🚲</span>
  &nbsp;Biking in Amsterdam
</h1>

becomes:

<h1>
  <img src="assets/img/bicycle.svg" alt="">
  &nbsp;Biking in Amsterdam
</h1>

👣 Inline SVG

Art using the <img src="art.svg"> can not be styled using CSS because it is not part of the document. The SVG Use syntax can be styled, but that is only applicable when you are using a SVG sprite sheet. If you have a single SVG graphic that you'd like to be embed as part of the document set data-emosvg-inline="true".

<h1>
  <span class="bomb emoji" data-emosvg="assets/icons/fontawesome/svg/bomb.svg" data-emosvg-inline="true">💣</span>
  &nbsp;Da bomb
</h1>

becomes

<h1>
  <svg width="2048" height="2048" viewBox="0 0 2048 2048" xmlns="http://www.w3.org/2000/svg"><path id="icon-bomb" d="M699 717q-10-25-34-35t-49 0q-108 44-191 127t-127 191q-10 25 0 49t35 34q13 5 24 5 42 0 60-40 34-84 98.5-148.5t148.5-98.5q25-11 35-35t0-49zm942-356l46 46-244 243 68 68q19 19 19 45.5t-19 45.5l-64 64q89 161 89 343 0 143-55.5 273.5t-150 225-225 150-273.5 55.5-273.5-55.5-225-150-150-225-55.5-273.5 55.5-273.5 150-225 225-150 273.5-55.5q182 0 343 89l64-64q19-19 45.5-19t45.5 19l68 68zm8-56q-10 10-22 10-13 0-23-10l-91-90q-9-10-9-23t9-23q10-9 23-9t23 9l90 91q10 9 10 22.5t-10 22.5zm230 230q-11 9-23 9t-23-9l-90-91q-10-9-10-22.5t10-22.5q9-10 22.5-10t22.5 10l91 90q9 10 9 23t-9 23zm41-183q0 14-9 23t-23 9h-96q-14 0-23-9t-9-23 9-23 23-9h96q14 0 23 9t9 23zm-192-192v96q0 14-9 23t-23 9-23-9-9-23v-96q0-14 9-23t23-9 23 9 9 23zm151 55l-91 90q-10 10-22 10-13 0-23-10-10-9-10-22.5t10-22.5l90-91q10-9 23-9t23 9q9 10 9 23t-9 23z"></path></svg>
  &nbsp;Da bomb
</h1>

Now that the SVG is part of the document it can be further art directed.

Inline SVG relies on the Fetch API so make sure you polyfill it if necessary before loadin  emoSVG.

Inlining SVG is an async action as a fetch() request must be made to load the artwork. emoSVG promises to let you know when that is done:

emoSVG(emoji).then(function() {
  console.log('inline SVGs loaded');
  svg4everybody();
});

👾 Raster Graphics

Scalable Vector Graphics are all the rage, but emoSVG understands you may want to get your bitmap on.

<h1>
  <span class="emoji" data-emosvg="assets/img/bicycle.png">🚲</span>&nbsp;Biking in Amsterdam
</h1>

becomes:

<h1>
  <img src="assets/img/bicycle.png" alt="" />&nbsp;Biking in Amsterdam
</h1>

Feel free to use any rasterized graphic you like. File extensions other than SVG will be treated as raster graphics.

🐣 Sizing SVG Icons

Emoji will be sized relative to the text they surround. If you want to make sure your SVG icons aren't oversized in the absense of CSS styles, set the style or data-emojisvg-style attributes on your span.emoji. emoSVG will look for the style attribute and then if not found the data-emojisvg-style attribute and if found will set the style attribute on the svg.emoji.

<h1>
  <span class="emoji" data-emosvg="assets/img/bicycle.svg" style="width:1em;height:1em">🚲</span>&nbsp;Biking in Amsterdam
</h1>

becomes:

<h1>
  <img src="assets/img/bicycle.png" style="width:1em;height:1em" />&nbsp;Biking in Amsterdam
</h1>

😎 Hiding Icons from Screen Readers

Emoji are implicitly accessible! There is no need to add alt text or labels. If you'd like to use Emoji strictly visually and hide them from screen readers use the aria-hidden attribute.

<h1>
  <span class="emoji" data-emosvg="assets/img/party.svg" aria-hidden>🎉</span>
  &nbsp;Party! You're invited&nbsp;
</h1>

👻 ARIA Hidden

Please note that if the aria-hidden attribute exists and is set to anything other than false the enhanced graphic will inherit the aria-hidden attribute value.

<h1>
  <span class="emoji" data-emosvg="assets/img/fontawesome.svg#bicycle" aria-hidden="true">🚲</span>
  &nbsp;Biking in Amsterdam
</h1>

becomes:

<h1>
  <svg aria-hidden="true">
    <use xlink:href="assets/img/fontawesome.svg#bicycle"></use>
  </svg>
  &nbsp;Biking in Amsterdam
</h1>

📣 Describing Enhaned Icons

If you'd like to describe the SVG icon the data-emosvg-alt attribute has your back. If you are making use of <title> in your SVG code this may be unecessary.

<h1>
  <span class="emoji" data-emosvg="assets/img/fontawesome.svg#bicycle" data-emosvg-alt="Graphic of a commuter bicycle">🚲</span>
  &nbsp;Biking in Amsterdam
</h1>

becomes:

<h1>
  <svg>
    <title>Graphic of a commuter bicycle</title>
    <use xlink:href="assets/img/fontawesome.svg#bicycle"></use>
  </svg>
  &nbsp;Biking in Amsterdam
</h1>

and likewise this:

<h1>
  <span class="emoji" data-emosvg="assets/img/bicycle.png" data-emosvg-alt="Raster icon of an old blue bike">🚲</span>&nbsp;Biking in Amsterdam
</h1>

becomes:

<h1>
  <img src="assets/img/bicycle.svg" alt="Raster icon of an old blue bike">
  &nbsp;Biking in Amsterdam
</h1>

Undo/Redo Support

emoSVG lets you switch back and forth from interpretive Emoji icons to declarative art directed icons.
Whatever.

Just call emoSVG(document.querySelectorAll('.emoji')) and all your icons will be toggled between Emoji and declarative icons.

This is useful for offering an Accessibility Preferences component that allows users freedom of choice. Remember saving bandwidth isn't the only advantage to Emoji icon sets. To certain users, Emoji icons may be more legible than declarative icons.

Getting Started

After cloning the repository run npm install or yarn to install the node_modules. You can then build and test the project.

Optionally enable Growl notifications install terminal-notifier with RubyGems:

gem install terminal-notifier

Note: Depending on your Ruby setup you may need to use sudo gem install terminal-notifier.

Test emoSVG

grunt test

Build emoSVG

grunt build

Watch emoSVG

grunt watch #watches source files in _build/js for changes and build files