Components

Progress

Indeterminate

HTML

<div class="ui-progress">
  <progress aria-busy="true"></progress>
</div>

Determinate

HTML

<div class="ui-progress">
  <progress id="determinate-progress" value="10" max="100"></progress>
</div>

Variants

Use the modifier classes .ui-filled, .ui-default, or.ui-tonal on the wrapper <div> to swap the progress bar track surface for better contrast on different backgrounds.

HTML

<div class="ui-progress ui-default">
  <progress value="25" max="100"></progress>
</div>
<div class="ui-progress ui-filled">
  <progress value="50" max="100"></progress>
</div>
<div class="ui-progress ui-tonal">
  <progress value="75" max="100"></progress>
</div>

Accessibility

If the <progress> element is describing the loading progress of a section of a page:

use aria-describedby to point to the status
set aria-busy="true" on the section that is being updated, removing it when loading is finished.

Source: MDN

Content here is loading.

HTML

<div aria-busy="true" aria-describedby="progress-bar">
  Content here is loading.
</div>
<div class="ui-progress">
  <progress aria-label="Content loading…" id="progress-bar"></progress>
</div>

API

Progress API

Type	Modifiers	Default	Description
Value	`progress[value]`	-	The current value. Omit it for an indeterminate state.
Variants	`.ui-default`, `.ui-filled`, `.ui-tonal`	-	The variant to use.

Parts

Part	Description
`.ui-progress`	Container element.
`<progress>`	The progress bar.

Installation

progress.css

@layer components.root {
  :where(.ui-progress) {
    --_motion: var(--motion, 1);
    --_accent-color: var(--primary);
    --_bg-color: var(--surface-tonal);

    background-color: var(--_bg-color);
    block-size: var(--size-1);
    border-radius: var(--border-radius, 0.25rem);
    display: inline-block;
    inline-size: 100%;
    overflow: hidden;
    position: relative;
    vertical-align: baseline;

    /* Color */
    &.ui-filled {
      --_bg-color: var(--surface-filled);
    }

    &.ui-default {
      --_bg-color: var(--surface-default);
    }

    &.ui-tonal {
      --_bg-color: var(--surface-tonal);
    }

    & > progress {
      appearance: none;
      background: none;
      block-size: 100%;
      border: 0;
      display: block;
      inline-size: 100%;

      &::-webkit-progress-bar {
        background: none;
        border-radius: var(--border-radius, 0.25rem);
      }

      &[value]::-webkit-progress-value {
        background-color: var(--_accent-color);
        transition: inline-size calc(0.2s * var(--_motion))
          var(--ease-out-4, cubic-bezier(0, 0, 0.1, 1));
      }

      &::-moz-progress-bar {
        background-color: var(--_accent-color);
      }
    }
  }

  :where(.ui-progress):has(> progress:indeterminate) {
    &::after {
      animation: indeterminate calc(2s * var(--motion, 1)) linear infinite;
      background-color: var(--_accent-color);
      content: "";
      inset: 0 auto 0 0;
      position: absolute;
      will-change: inset-inline-start, inset-inline-end;
    }

    & > progress {
      &::-webkit-progress-value {
        background-color: transparent;
      }

      &::-moz-progress-bar {
        background-color: transparent;
      }
    }
  }

  [dir="rtl"] {
    :where(.ui-progress):has(> progress:indeterminate) {
      &::after {
        animation-direction: reverse;
      }
    }
  }

  @keyframes indeterminate {
    0% {
      inset-inline-end: 100%;
      inset-inline-start: -200%;
    }

    60% {
      inset-inline-end: -8%;
      inset-inline-start: 107%;
    }

    100% {
      inset-inline-end: -8%;
      inset-inline-start: 107%;
    }
  }
}