Provide up-to-date feedback on the progress of a workflow or action with simple yet flexible progress bars.
Progress bars use CSS3 transitions and animations to achieve some of their effects. These features are not supported in Internet Explorer 9 and below or older versions of Firefox. Opera 12 does not support animations.
If your website has a Content Security Policy (CSP) which doesn't allow
style-src 'unsafe-inline', then you won't be able to use inline
element.style.width) or using custom CSS classes.
Default progress bar.