This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

The ::-webkit-meter-optimum-value CSS pseudo-element styles the <meter> element when its value is inside the low-high range.

Green is the default color.


Not part of any specification. This is a proprietary pseudo-element specific to WebKit/Blink.



<meter min="0" max="10" value="6">Score out of 10</meter>


meter::-webkit-meter-bar {
  /* Required to get rid of the default background property */
  background : none;
  background-color : whiteSmoke;
  box-shadow : 0 5px 5px -5px #333 inset;

meter::-webkit-meter-optimum-value {
  box-shadow: 0 5px 5px -5px #999 inset;


Note: This will only work in Webkit/Blink-based browsers.

Browser compatibility

Feature Firefox (Gecko) Chrome Internet Explorer Opera Safari
Basic support No support (Yes) No support (Yes) (Yes)
Feature Firefox Mobile (Gecko) Android IE Phone Opera Mobile Safari Mobile
Basic support No support (Yes) No support (Yes) (Yes)

See also

The pseudo-elements used by WebKit/Blink to style other parts of a <meter> element are as follows:

Document Tags and Contributors

 Contributors to this page: mfluehr, chrisdavidmills
 Last updated by: mfluehr,