Ejemplo 1: cargador de arranque
<div class="spinner-border text-primary" role="status">
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</div>
<div class="spinner-border text-secondary" role="status">
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</div>
<div class="spinner-border text-success" role="status">
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</div>
<div class="spinner-border text-danger" role="status">
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</div>
<div class="spinner-border text-warning" role="status">
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</div>
<div class="spinner-border text-info" role="status">
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</div>
<div class="spinner-border text-light" role="status">
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</div>
<div class="spinner-border text-dark" role="status">
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</div>
Ejemplo 2: cargador de arranque
<button class="btn btn-primary" type="button" disabled>
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</button>
<button class="btn btn-primary" type="button" disabled>
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</button>
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