To caption a progress bar, simply add a <div> with your caption text and associate the caption with the <progress> element using the aria-describedby attribute.
Internet Explorer 9 doesn’t support the HTML5 <progress> element, but we can work around that.
Progress bars use some of the same button and alert classes for consistent styles.
Uses a gradient to create a striped effect.
Add .progress-lg or .progress-sm for additional sizes.
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