Principe

Les barres de progression sont disponibles avec gestion de nombreux critères (étiquettes, hauteur, contextes, multiples, rayures, animations, etc.).

Exemples basiques
<div class="progress" role="progressbar" aria-label="Basic example" aria-valuenow="0" aria-valuemin="0" aria-valuemax="100">
    <div class="progress-bar" style="width: 0%"></div>
</div>
<div class="progress" role="progressbar" aria-label="Basic example" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100">
    <div class="progress-bar" style="width: 25%"></div>
</div>
<div class="progress" role="progressbar" aria-label="Basic example" aria-valuenow="50" aria-valuemin="0" aria-valuemax="100">
    <div class="progress-bar" style="width: 50%"></div>
</div>
<div class="progress" role="progressbar" aria-label="Basic example" aria-valuenow="75" aria-valuemin="0" aria-valuemax="100">
    <div class="progress-bar" style="width: 75%"></div>
</div>
<div class="progress" role="progressbar" aria-label="Basic example" aria-valuenow="100" aria-valuemin="0" aria-valuemax="100">
    <div class="progress-bar" style="width: 100%"></div>
</div>
Dimensions
Largeur
<div class="progress" role="progressbar" aria-label="Basic example" aria-valuenow="75" aria-valuemin="0" aria-valuemax="100">
    <div class="progress-bar w-75"></div>
</div>
Hauteur
<div class="progress" role="progressbar" aria-label="Example 1px high" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100" style="height: 1px">
    <div class="progress-bar" style="width: 25%"></div>
</div>
<div class="progress" role="progressbar" aria-label="Example 20px high" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100" style="height: 20px">
    <div class="progress-bar" style="width: 25%"></div>
</div>
Étiquette

Possibilité d'indiquer la valeur par-dessus la barre de progression.

25%
<div class="progress" role="progressbar" aria-label="Example with label" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100">
    <div class="progress-bar" style="width: 25%">25%</div>
</div>
Contextes

Possibilité de personnaliser la barre de progression en utilisant les classes utilitaires de Bootstrap.

<div class="progress" role="progressbar" aria-label="Success example" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100">
    <div class="progress-bar bg-success" style="width: 25%"></div>
</div>
<div class="progress" role="progressbar" aria-label="Info example" aria-valuenow="50" aria-valuemin="0" aria-valuemax="100">
    <div class="progress-bar bg-info" style="width: 50%"></div>
</div>
<div class="progress" role="progressbar" aria-label="Warning example" aria-valuenow="75" aria-valuemin="0" aria-valuemax="100">
    <div class="progress-bar bg-warning" style="width: 75%"></div>
</div>
<div class="progress" role="progressbar" aria-label="Danger example" aria-valuenow="100" aria-valuemin="0" aria-valuemax="100">
    <div class="progress-bar bg-danger" style="width: 100%"></div>
</div>
... avec étiquette
25%
50%
75%
100%
<div class="progress" role="progressbar" aria-label="Success example" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100">
    <div class="progress-bar text-bg-success" style="width: 25%">25%</div>
</div>
<div class="progress" role="progressbar" aria-label="Info example" aria-valuenow="50" aria-valuemin="0" aria-valuemax="100">
    <div class="progress-bar text-bg-info" style="width: 50%">50%</div>
</div>
<div class="progress" role="progressbar" aria-label="Warning example" aria-valuenow="75" aria-valuemin="0" aria-valuemax="100">
    <div class="progress-bar text-bg-warning" style="width: 75%">75%</div>
</div>
<div class="progress" role="progressbar" aria-label="Danger example" aria-valuenow="100" aria-valuemin="0" aria-valuemax="100">
    <div class="progress-bar text-bg-danger" style="width: 100%">100%</div>
</div>
Multiple...

Possibilité d'avoir plusieurs barres dans le même conteneur avec .progress-stacked.

<div class="progress-stacked">
    <div class="progress" role="progressbar" aria-label="Segment one" aria-valuenow="15" aria-valuemin="0" aria-valuemax="100" style="width: 15%">
        <div class="progress-bar"></div>
    </div>
    <div class="progress" role="progressbar" aria-label="Segment two" aria-valuenow="30" aria-valuemin="0" aria-valuemax="100" style="width: 30%">
        <div class="progress-bar bg-success"></div>
    </div>
    <div class="progress" role="progressbar" aria-label="Segment three" aria-valuenow="20" aria-valuemin="0" aria-valuemax="100" style="width: 20%">
        <div class="progress-bar bg-info"></div>
    </div>
</div>
Rayures et animation

Sur .progress-bar, ajouter la classe .progress-bar-striped pour avoir un effet rayé et .progress-bar-animated pour avoir un effet d'animation.

<div class="progress" role="progressbar" aria-label="Default striped example" aria-valuenow="10" aria-valuemin="0" aria-valuemax="100">
            <div class="progress-bar progress-bar-striped" style="width: 10%"></div>
        </div>
        <div class="progress" role="progressbar" aria-label="Success striped example" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100">
            <div class="progress-bar progress-bar-striped progress-bar-animated bg-success" style="width: 25%"></div>
        </div>
        <div class="progress" role="progressbar" aria-label="Info striped example" aria-valuenow="50" aria-valuemin="0" aria-valuemax="100">
            <div class="progress-bar progress-bar-striped bg-info" style="width: 50%"></div>
        </div>
        <div class="progress" role="progressbar" aria-label="Warning striped example" aria-valuenow="75" aria-valuemin="0" aria-valuemax="100">
            <div class="progress-bar progress-bar-striped progress-bar-animated bg-warning" style="width: 75%"></div>
        </div>
        <div class="progress" role="progressbar" aria-label="Danger striped example" aria-valuenow="100" aria-valuemin="0" aria-valuemax="100">
            <div class="progress-bar progress-bar-striped bg-danger" style="width: 100%"></div>
        </div>
CSS
Variables CSS
--#{$prefix}progress-height: #{$progress-height};
@include rfs($progress-font-size, --#{$prefix}progress-font-size);
--#{$prefix}progress-bg: #{$progress-bg};
--#{$prefix}progress-border-radius: #{$progress-border-radius};
--#{$prefix}progress-box-shadow: #{$progress-box-shadow};
--#{$prefix}progress-bar-color: #{$progress-bar-color};
--#{$prefix}progress-bar-bg: #{$progress-bar-bg};
--#{$prefix}progress-bar-transition: #{$progress-bar-transition};
Variables SASS
$progress-height:                   1rem;
$progress-font-size:                $font-size-base * .75;
$progress-bg:                       var(--#{$prefix}secondary-bg);
$progress-border-radius:            var(--#{$prefix}border-radius);
$progress-box-shadow:               var(--#{$prefix}box-shadow-inset);
$progress-bar-color:                $white;
$progress-bar-bg:                   $primary;
$progress-bar-animation-timing:     1s linear infinite;
$progress-bar-transition:           width .6s ease;