问如何设置HTML5 <meter>标签的样式

EN

<meter value=80 min=0 max=100>
  80/100
</meter>

meter::-webkit-meter-horizontal-bar {
-webkit-appearance: meter;
background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#DDD), color-stop(0.2, #EEE), color-stop(0.45, #CCC), color-stop(0.55, #CCC), to(#DDD));
}
Pseudo element
meter::-webkit-meter-horizontal-optimum-value {
-webkit-appearance: meter;
background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#AD7), color-stop(0.2, #CEA), color-stop(0.45, #7A3), color-stop(0.55, #7A3), to(#AD7));
}
Pseudo element
meter::-webkit-meter-horizontal-suboptimal-value {
-webkit-appearance: meter;
background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#FE7), to(#FE7), color-stop(0.2, #FFC), color-stop(0.45, #DB3), color-stop(0.55, #DB3));
}
Pseudo element
meter::-webkit-meter-horizontal-even-less-good-value {
-webkit-appearance: meter;
background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#F77), to(#F77), color-stop(0.2, #FCC), color-stop(0.45, #D44), color-stop(0.55, #D44));
}
Pseudo element
meter::-webkit-meter-vertical-bar {
-webkit-appearance: meter;
background: -webkit-gradient(linear, 0% 0%, 100% 0%, from(#DDD), to(#DDD), color-stop(0.2, #EEE), color-stop(0.45, #CCC), color-stop(0.55, #CCC));
}
Pseudo element
meter::-webkit-meter-vertical-optimum-value {
-webkit-appearance: meter;
background: -webkit-gradient(linear, 0% 0%, 100% 0%, from(#AD7), to(#AD7), color-stop(0.2, #CEA), color-stop(0.45, #7A3), color-stop(0.55, #7A3));
}
Pseudo element
meter::-webkit-meter-vertical-suboptimal-value {
-webkit-appearance: meter;
background: -webkit-gradient(linear, 0% 0%, 100% 0%, from(#FE7), to(#FE7), color-stop(0.2, #FFC), color-stop(0.45, #DB3), color-stop(0.55, #DB3));
}
Pseudo element
meter::-webkit-meter-vertical-even-less-good-value {
-webkit-appearance: meter;
background: -webkit-gradient(linear, 0% 0%, 100% 0%, from(#F77), to(#F77), color-stop(0.2, #FCC), color-stop(0.45, #D44), color-stop(0.55, #D44));
}