You can style the color of the bar in the <progress>
element by changing the background
of a few browser-proprietary selectors.
In Firefox, you can use the following:
progress::-moz-progress-bar { background: blue; }
In Chrome or Safari, you can use:
progress::-webkit-progress-value { background: blue; }
In IE10, you just need to use the color
attribute:
progress { color: blue; }
Source: http://html5doctor.com/the-progress-element/
Altogether, that makes:
progress::-moz-progress-bar { background: blue; }
progress::-webkit-progress-value { background: blue; }
progress { color: blue; }
<progress value="0" max="100"></progress><br>
<progress value="25" max="100"></progress><br>
<progress value="50" max="100"></progress><br>
<progress value="75" max="100"></progress><br>
<progress value="100" max="100"></progress><br>
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