Components

Progress

Indeterminate

HTML

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

Determinate

HTML

<progress value="10" max="100"></progress>

Variants

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

HTML

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

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>
<progress
  aria-label="Content loading…"
  class="progress"
  id="progress-bar"
></progress>

API

Type	Modifiers	Default	Description
Progress	`<progress>`	-	The native HTML progress element.
Indeterminate	No `value` attribute	-	Display an indeterminate loading state.
Variant	`.filled`, `.default`, `.tonal`	-	Modifiers for different background surfaces.

Installation

progress.css

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

    appearance: none;
    background-color: var(--_bg-color);
    block-size: var(--size-1);
    border: 0;
    border-radius: var(--border-radius, 0.25rem);
    display: inline-block;
    inline-size: 100%;
    overflow: hidden;
    position: relative;
    vertical-align: baseline;

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

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

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

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

    &[value]::-webkit-progress-value {
      background-color: var(--_accent-color);

      @media (prefers-reduced-motion: no-preference) {
        transition: inline-size 0.2s var(--ease-out-4, cubic-bezier(0, 0, 0.1, 1));
      }
    }

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

  @media (prefers-reduced-motion: no-preference) {
    progress:indeterminate {
      background-color: var(--_bg-color);

      &::after {
        animation: indeterminate 2s linear infinite;
        background-color: var(--_accent-color);
        content: "";
        inset: 0 auto 0 0;
        position: absolute;
        will-change: inset-inline-start, inset-inline-end;
      }

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

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

    [dir="rtl"] {
      :where(progress):indeterminate {
        animation-direction: reverse;

        &::after {
          animation-direction: reverse;
        }
      }
    }
  }

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

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

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