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Components

Spinner

Add it to an element with aria-busy="true". Spinners are always indeterminate. See also: Progress bar. 

<div aria-busy="true"></div>

Sizes

The spinner's size is set to 1em, which means it will adjust to its current font size.

h2

h4

Paragraph

Span Link 
<h2 aria-busy="true">h2</h2>
<h4 aria-busy="true">h4</h4>
<p aria-busy="true">Paragraph</p>
<span aria-busy="true">Span</span>
<a href="#sizes" aria-busy="true" class="ui-link">Link</a>

Buttons

Simply add aria-busy="true" to a <button>. 

<!-- Text buttons -->
<button aria-busy="true" class="ui-button">Text</button>
<button aria-busy="true" disabled class="ui-button ui-outlined">
  Outlined
</button>
<button aria-busy="true" class="ui-button ui-filled">Filled</button>


<!-- Icon buttons -->
<button aria-busy="true" class="ui-button">
  <span class="ui-sr-only">Text</span>
</button>
<button aria-busy="true" disabled class="ui-button ui-outlined">
  <span class="ui-sr-only">Outlined</span>
</button>
<button aria-busy="true" class="ui-button ui-filled">
  <span class="ui-sr-only">Filled</span>
</button>

When not to use aria-busy="true"

There are a few exceptions where aria-busy="true" won't render a spinner. Either because it doesn't make sense or because there are other reasons you would like to use that aria attribute.

1. Because it's blocked by another use case

In conjunction with the <progress> element aria-busy="true" is used on the section that is being updated. Rendering a spinner here would result in a spinner and a progress bar which doesn't make sense.

See progress accessibility section for more.

2. Because it doesn't make sense

  • <input>
  • <select>
  • <textarea>
  • <html>
  • <progress>

API

Type Modifiers Default Description
State aria-busy="true" - Renders a spinner pseudo-element on the element. Always indeterminate.
Sizes font-size on the element 1em Spinner size follows the element's computed font size.
Excluded <input>, <select>, <textarea>, <html>, <progress>, elements with aria-describedby - Elements that never receive a spinner.

Installation

@layer components.root {
  [aria-busy="true"]:not(
    input,
    select,
    textarea,
    html,
    progress,
    [aria-describedby]
  ) {
    position: relative;


    &::before {
      animation: spin 0.7s linear infinite;
      block-size: 1em;
      border-color: transparent currentColor currentColor;
      border-radius: 50%;
      border-style: solid;
      border-width: 3px;
      content: "";
      display: inline-block;
      inline-size: 1em;
      opacity: 0.5;
      vertical-align: -0.14em;
    }


    &:not(button.ui-button):not(:empty) {
      &::before {
        margin-inline-end: 0.5em;
      }
    }
  }


  @keyframes spin {
    to {
      transform: rotate(1turn);
    }
  }
}