Gifa11y

Easily add pause buttons to your GIFs. This script is intended for shorter GIFs that loop indefinitely. It only generates a still of the first frame.

Automatic
- Generates a still using <canvas> element
- No need to upload png/jpeg "still" of GIF
Accessible
- Keyboard accessible
- Unique accessible names for buttons based on alt text
- Large target size (50px by 50px)
- Respects prefers-reduced-motion media query
Vanilla JavaScript, no dependencies

▶️ View Gifa11y demo

Alternatively check out Gifa11y demo on CodePen to view HTML before Gifa11y does its magic. Experiment with different props and settings.

Example installation

Refer to Props to easily customize.

<script src="/gifa11y.min.js"></script>
<script type="text/javascript">
    var gifa11y = new Gifa11y({
        container: 'main',
        buttonBackground: '#000000',
        buttonBackgroundHover: '#404040',
        buttonIconColor: 'white'
    });
</script>

Props

Colours, exclusions, and other features

Property	Default	Description
`buttonBackground`	'indigo'	String: Any hexcode, rgb value, CSS colour keyword.
`buttonBackgroundHover`	'rebeccapurple'	String: Any hexcode, rgb value, CSS colour keyword.
`buttonIconColor`	'white'	String: Any hexcode, rgb value, CSS colour keyword.
`buttonFocusColor`	'#00e7ffad'	String: Any hexcode, rgb value, CSS colour keyword.
`buttonIconSize`	'1.5rem'	String: Adjust height and width of SVG.
`buttonIconFontSize`	'1rem'	String: Adjust `font-size` of an icon font (if passing an icon font via prop). E.g. `<i class="fas fa-play"></i>`
`buttonPlayIconID`	' '	String: Supply your own play icon with an existing element on the page via it's unique `id`.
`buttonPauseIconID`	' '	String: Supply your own pause icon with an existing element on the page via it's unique `id`
`buttonPlayIconHTML`	' '	String: Supply your own play icon using an icon font or SVG. e.g. `<i class="fas fa-play"></i>`
`buttonPauseIconHTML`	' ',	String: Supply your own pause icon using an icon font or SVG. e.g. `<i class="fas fa-pause"></i>`
`container`	'body'	String: Add a pause button to GIFs within a specific area only. E.g. pass `main` for main content area.
`exclusions`	' '	String: Ignore specific GIFs or regions. Use commas to separate. E.g. `.jumbotron`
`gifa11yOff`	'.gifa11y-off'	String: Don't run Gifa11y if page contains class/selector. E.g. `.authorMode`
`inheritClasses`	'true'	Boolean: If canvas element should inherit the same classes as the GIF.
`initiallyPaused`	'false'	Boolean: If you want all GIFs to be paused at first.
`missingAltWarning`	'true'	Boolean: warn content author if they are missing an alt attribute on GIF. Appended to GIF.

Language / i18n

Property	Default	Description
`langPause`	'Pause animation:'	String: Start of aria-label for each button.
`langPlay`	'Play animation:'	String: Start of aria-label for each button.
`langPauseAllButton`	'Pause all animations'	String: toggle all button.
`langPlayAllButton`	'Play all animations'	String: toggle all button.
`langMissingAlt`	'Missing image description.'	String: If alt is missing on GIF, this string populates the aria-label for the corresponding pause button.
`langAltWarning`	'⚠ Please add alternative text to GIF.'	String: If GIF is missing alt text.

Optional features

Ignore specific GIFs

To prevent certain GIFs from getting a pause button. You can either:

Add gifa11y-ignore as a CSS class to your image. E.g. <img src="gandalf.gif" class="gifa11y-ignore" ...
Rename your GIF and include the text gifa11y-ignored in the file name. E.g. <img src="gandalf-gifa11y-ignored.gif" ...
Use exclusions prop.

Pause GIFs initially

For those who prefer reduced motion via system prefs, GIFs will automatically be paused on page load. Although if you'd like specific gifs to be paused initially on page load (without reduced motion enabled), you can either:

Add gifa11y-paused as a CSS class to your image. E.g. <img src="gandalf.gif" class="gifa11y-paused" ...
Rename your GIF and include the text gifa11y-paused in the file name. E.g. <img src="gandalf-gifa11y-paused.gif" ...
Set initiallyPaused prop to true

Toggle all GIFs button

A button to toggle all GIFs. Add <button id="gifa11y-all">Pause all animations</button> within your HTML.

Please note:

The "toggle all animations" button has no CSS styling. BYO-CSS (Bring your own CSS).
Button becomes clickable only after GIFs have fully loaded. Uses disabled attribute while page is loading.

Colophon

I was looking for a simple solution to automatically add pause buttons to GIFs, although I could not find anything that was 100% automatic, accessible, and considered loading time of images. I came across a few clever methods which involve swapping a .jpg still - although ain't nobody got time for that. This script uses the <canvas> method to generate a still. I learned a few things developing this:

Canvas element: I came across the canvas method in a couple CodePens like this one by hoanghals. This specific pen is a bit more fancy as it relies on another library by Buzzfeed called libgif-js to generate stills at various frames. I also learned that canvas calculates from half a pixel. So you need to add 0.5 pixels when generating a canvas still, otherwise you will notice a slight content shift.
Timing: Timing is very important... Images must load completely before you can determine height/width. If image is not completely done loading, then clientWidth will return 0. Image dimensions are needed to generate a still using <canvas>. For this reason, pause buttons are generated after each image is done loading. If you have multiple images on a page, you'll notice that this process takes time. GIFs won't be instantly paused if you have prefers-reduced-motion enabled or use the initiallyPaused prop - you may notice a slight delay depending on your internet speed.
To help make gifa11y easily customizable, I referenced this great tutorial: How to create a framework-agnostic Javascript plugin by Sodeeq Elusoji.

If you need a more comprehensive solution to deal with various types of animations, I recommend checking out Scott Vinkle's Togglific!

hugosolar / gifa11y